LG TV does not turn on: causes, diagnosis and elimination
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often than not, the TV won’t turn on due to power problems. The old power connector may burn out or be damaged, then we will replace it with a new one. Or there may be a problem with the power supply. In case of maintainability, we can restore it to work, or change it to a new one.
Problems with firmware and software
If the LG Smart-TV does not turn on, and the indicator is on, it is possible that the drivers that are responsible for broadcasting the image have flown in it. Also the software could be out of date. In this case, you can find special utilities. but this is a long time, so it is impractical. It’s easier to do a flashing right away. But first, the reason for the software crashes is clarified. To do this, check the information in the system settings. If it is not there, a flashing is definitely required. If there is an alert that the software is out of date, you will need to update it. Software is usually downloaded from the Internet.
After installing the new software, the equipment automatically restarts, and then turns on and starts working in normal mode.
The TV does not turn on, the indicator is off
If the TV does not turn on and the indicator does not light up, first of all, check if there is voltage in the outlet, whether the power cable is damaged, whether the remote control is working, the power button. If everything is in order, you need to look for the problem inside the TV receiver. Hardware malfunctions in this case are usually always associated with a lack of power. This means that contacts and loops could have moved away from the power board. Also, contacts could close.
Checking the TV boards is performed with a multimeter. All contacts, starting from the mains input, are checked until a point is found where there is no current supply. If such an area is not detected, then, most likely, the power supply unit, outlet or cable is broken. The power supply is usually changed. Contacts. soldered, as well as loops.
LG TV won’t turn on: causes and remedies
LG is a popular manufacturer of household appliances. The brand produces reliable, high quality and functional TVs. But, unfortunately, even the highest quality equipment fails over time.
It often happens that the LG TV does not turn on. Why is this happening? Malfunctions can be associated with a large number of problems, which we will talk about further.
Why LG TV won’t turn on?
For Plasma, LED and LCD TV models LG, the malfunction may manifest itself as follows:
- The TV does not turn on, but the indicator is on.
- The TV does not start, but the light is flashing red.
- When you turn on the TV, extraneous sounds occur: whistling, hum, clicks.
- The TV does not turn on and the indicator is off.
- The TV does not start, freezes on the splash screen (the LG logo lights up and nothing happens)
There are many reasons why the TV does not turn on. They can be divided into three main categories. These are system failures due to a malfunction of software or applications, peripheral problems that arise due to improper operation of devices connected to the TV, as well as hardware failures associated with defective TV elements.
Usually, troubleshooting starts with external devices connected to the TV. You can also see the settings, damage to the cables. Only after that they begin to diagnose internal elements: matrices, boards, etc. It is better if specialists are involved in testing.
Wrong mode selected
If the TV worked just recently, but suddenly stopped turning on, it may have come out of standby mode. Could accidentally turn on:
- Custom modes “Energy-saving”, “Sleep”, due to which the equipment is turned off immediately after starting. It is necessary to deactivate the timer and exit the incorrectly set mode.
- Protection from children. In this case, the buttons on the TV receiver body will be blocked. If the remote control does not work, you will have to use a network restart.
It’s also worth checking out third party utilities. You can reset the current settings to the factory settings. Of course, if you do not know how to perform the listed actions, it is better to immediately contact the specialists.
Often a black TV screen indicates backlight problems. If the LED strip or backlight is out of order, there is no picture on the screen. The backlight is usually changed, and this is done only in a service center. It is impossible to cope with such a task on your own without special skills.
Why Philips TV does not turn on: what to look for the problem
If the light is on, but the TV does not turn on, then we can assume that the consumer has incorrectly applied the active mode. Many of the latest devices have features that allow you to enter a “sleep” state. With this turn of events, the TV must respond to the remote control. You just need to go to the menu and turn on the “TV” mode.
In case your Philipstea1507p TV is connected via an extension cable, it is worth checking if any parts are damaged, like microcircuits or a capacitor, or the power supply and buttons. In this case, it is best not to try to fix the problem yourself. Your wrong actions can only harm the device even more.
If you intend, nevertheless, to try to fix the device on your own, then read the instructions carefully and follow only its instructions. Start by trying to turn the TV off and on again. If your TV model is relatively new, and purchased recently, then it should not have global problems. The simplest breakdown can be a faulty power button. It may just be disabled. If the indicator light on the TV is on, but the device itself does not turn on, then everything is in order with the power supply, it is just that the device did not turn on the first time. Don’t look for other reasons yet, just try restarting your device.
In order to start the system, try the following steps:
- If the indicator does not turn on from the remote control, then try to turn on the device directly from the control panel of the TV itself. Perhaps you just have a faulty remote control, or it has run out of batteries.
- When the TV does not want to turn on from the TV panel, then you need to pay attention to the standby indicator.
- A dark screen will also be with a weak transmitted signal, or if the antenna is poorly plugged in.
- Sometimes after turning on, the TV screen lights up, and after a few seconds it turns off again. This may mean that one of the device’s microcircuits is broken, and its quick shutdown is a simple protective function. If the device goes into protection, you should call the telemaster.
If the TV turns on for a long time, then the cause may be a malfunction of one of the television units. Different TV models can have very different breakdowns. It is difficult to find serious faults without proper experience. It is better to give it to a specialist for repair.
LG TV does not turn on: light is flashing
Like any home appliance, TVs are prone to malfunction. This can happen regardless of the period of operation of the device and the manufacturer.
When the relay indicator blinks, then LG TVs of the 42pa4510, ld33b, 42ld650, 42la621v series themselves give a signal that the device has a problem. Usually the red light should flash a certain number of times. You just have to open the user manual and find the section in which the types of breakdowns and their indication are indicated, with which the device reacts to the problem.
Another option that can cause a similar symptom appears when a computer is connected to the TV as a monitor, or a player. If the latter went into “sleep mode”, or maybe completely turned off, then the TV, when turned on by the remote control, will beep for a few seconds by the indicator.
This is the principle used by modern TVs from the following companies:
- Samsung le37c530f1w;
- Toshiba (Toshiba);
- Mystery (Mystery);
- Bbk (Vvk, BBK) led2452fdtg, lem2488fdt, led;
- Dns (DNS) m24dm8;
- Sony (Sony) Erickson, Erisson, Bravia;
- Hyundai (Hyundai, Hyundai;)
- Helix (Helix);
- Supra led;
Overheating of internal parts or the TV case is a very common problem for modern appliances. In this case, the non-turning on of the device, a dark indicator and clicks will make themselves felt even in a working model. Let the appliance rest for a couple of hours and everything will work out. Also, the TVs will whistle, and the indicator will not turn on if the power supply is too heavily loaded. By replacing the transformer, transistor or microcircuit, you can solve the problem. If the old TV set goes out, or the old TV set goes out, then the master should look for reasons here.
A modern TV does not turn on, and the indicator is on: what to do
If the TV does not turn on, it is best to contact a service center. But, if today is a day off, or trouble happened in the evening, then you can try to fix the problem yourself. First of all, you need to conduct a preliminary inspection of the equipment.
The instructions supplied with the device give full recommendations on this matter, and how to eliminate some basic, especially frequent and easy breakdowns. Sometimes the problem of not turning on the TV may be the wrong connection of the device, and the fact that the shutdown button is accidentally pressed, or the shutdown button may be damaged. Could also burn out the power supply.
Before looking for a solution to fix the problem, you need to determine exactly what type of device you have: LCD, plasma TV, or CRT. Currently, liquid crystal, CRT, and plasma devices are produced. If one of them breaks down, there will be no special differences in the repair, because the difference lies only in the “design”, and the internal structure of the device remains the same.
How to Fix LG TV Not Turning On Red Light On || Quick Solve in 2 minutes
TVs almost always have various problems, but at first glance they all have approximately the same symptoms:
- The indicator constantly blinks red and green;
- The device clicks, hums, pops or whistles;
- The indicator light does not work at all;
- The TV does not turn on, but the indicator lights up blue.
A broken device will be equally characterized by an immediate lack of reaction to pressing the buttons on the remote control, and a complete shutdown while the power supply is turned on. If the plasma does not start immediately, try again.
Samsung TV does not turn on: red light blinks and beeps
Before you start troubleshooting, you must try to turn on the TV again. It is very possible that the problem is hidden in the power button, if for some reason it did not work stably. The indicator light may or may not be on. In view of this, special attention should be paid to it.
Many of those who have purchased a Samsung TV of the le40r81b, le32r81b, le23r51b, le40s62b, le20s52bp models are faced with the problem of not turning on the TV. In this case, the light is on, but there is no damage. Don’t panic. In addition, you need to understand that the fault is not in the manufacturer of the equipment. A similar nuisance can happen to a product of any brand.
One of the most commonplace problems is a breakdown in the outlet or, in general, the reason for the blackout. You need to analyze the wiring for faults. Perhaps the breakdown lies in the shield or connector, which simply turned off or stopped working from a power surge. Sometimes the reason lies in the complete lack of electricity. You can check the outlet by plugging in another device or appliance. If there is no food in the entire apartment, then it is necessary to inspect the vending machines. If everything works for the neighbors, and your apartment is de-energized, and you have not identified any visual reasons, you need to contact a specialist. Let the master on duty take the necessary measures himself.
If the TV does not turn on and the indicator is off, you should:
- Check the serviceability of the socket into which the device is connected;
- Analyze the integrity of the device’s network cable;
- Check the voltage in the network throughout the apartment;
- Asking if neighbors have tension.
Only if there is a positive answer to all questions, it can be assumed that the malfunction must be looked for in the device itself.
The TV beeps and does not turn on
Television, today, is one of the most popular ways of recreation and leisure. And its serviceability worries all residents of the house. In order to avoid serious problems with this type of equipment, it is necessary to operate the device strictly in accordance with the instructions, and periodically carry out preventive examinations by a specialist.
Failure to comply with operating conditions
Failure to follow the rules of operation often leads to equipment malfunctions. Before connecting the TV and starting to use it, it is important to study the instruction manual for its operation.
The most frequent breakdown of a TV set through the fault of the user is mechanical damage to the screen, due to which it is necessary to replace the matrix and backlight.
Matrix and backlight burned out
If the TV has problems with the LCD matrix or LED backlight, then this is noticeable by the fact that there is a sharp deterioration in the image quality, its darkening.
The main signs of backlight and matrix breakage are:
- lack of a picture, but the presence of sound;
- the appearance of black and white or colored stripes on the monitor;
- beating pixels, ripples;
- LG logo does not appear when turning on the device.
Important! When you illuminate the screen with a flashlight, you can see the image on it, you do not need to look for other problems. this is a burned-out backlight.
You can check the backlight if the TV is practically disassembled into parts.
- ability to check the parameters of chain sections;
- know the basic values of the operating voltage of semiconductor crystals;
- show accuracy, dexterity and skills in soldering with an air dryer.
In the absence of the necessary knowledge and skills, it is better not to start an independent repair.
In a situation where the backlight of the LG TV does not work, the cost of repair will be significant, it is recommended to contact the seller of the device and request warranty repair.
Power indicator is blinking
Important! If the LED indicator is blinking, it means that the machine is trying to determine the type of malfunction. In most cases, the light bulb is red and can blink a number of times. in this way, it conveys a symbol for a breakdown.
To decode the signal, you just need to read the instructions included in the basic package. It is recommended to find the section that describes all types of breakdowns and find the reasons why the light bulb may blink. Owning the information received, you can independently normalize the launch of TV by taking appropriate measures.
But there may be another reason for this state of the device. the device is connected to computer equipment and is used as a monitor. When the computer has switched to sleep mode or turned off automatically, then when you try to turn it on from the remote control, a situation will be observed that the indicator is on.
Solving this problem can be elementary, you just need to wake up the device from sleep mode by pressing any button on the computer keyboard or by jerking the mouse.
TV-set is working, just connected to another image source.
The case is not excluded. the protection has been triggered, and the LG TV cannot turn on, and the indicator blinks. The reason for this is either device breakdowns or software failures. It is possible that the device was not simply taken out of sleep mode.
Remote control malfunction
If the remote control does not work, you can use a special application for smartphones and tablets instead, which turns the device into a full-fledged remote control. For example, you can use the free TV-Remote utility, which should be downloaded from the AppStore or Google Play. As a solution to the problem. replacing the batteries or the battery in the remote control, which does not work. this can also help.
Problems with firmware
TV devices supported by LG webOS may fail if there is a failure in the firmware. As a result of the next update of the operating system, if it was unsuccessful, a situation may occur with a repeated reboot of the device. It can be eliminated by manually updating the firmware from a USB stick. This can be done by any user who has read the instructions for the TV.
Situations when Smart TV does not work on the webOS platform are somewhat different from the previous ones. These models malfunction due to operating system problems. To avoid such cases, it is recommended to update the operating system in time.
Important! An incorrect device update is eliminated by downloading the firmware installation files to a USB flash drive, and from it the TV-device OS is updated.
The power indicator has gone out
It happens that the device cannot turn on at all, the light does not light up, there is no TV reaction to the remote control and the buttons on the front panel of the device. It is likely that the electricity has disappeared.
Important! It may happen that the indicator burns out, but then the TV should still turn on.
Based on the facts that the light does not light up and the TV does not turn on, we conclude that there is a problem with the supply of electricity.
A power outage occurs in several situations:
- there is no electricity anywhere in the house;
- knocked out a machine gun in the dashboard;
- the outlet where the plug of the cord from the television device is connected is broken;
- the extension cord was damaged if the TV device is connected through it to the outlet;
- having problems with the wiring.
The first thing to do first is to check if the outlet and extension cord are working properly. It is also necessary to look at the flap, change the position of the toggle switches.
If the previous action did not help, then you should look for the cause of the problem in the broken outlet. To do this, it is recommended to simply plug the TV plug into another outlet.
When it is not working, there is no electricity. Call an electrician to fix the wiring problem.
When the TV model is a CRT, then the reasons for its breakdown are a blown fuse. A blown fuse can be replaced with a new one.
The most common reason for the inability to turn on a TV device is a breakdown of a TV device of more modern models (for example, a breakdown of a microcircuit, a power adapter or a capacitor).
All equipment in the complex should be diagnosed. Having decided on a part that does not work correctly, you just need to replace it. After replacing a broken part, the TV set should, in theory, turn on.
If the LV is completely extinguished, this does not always mean that the technique is broken. Often, the TV does not turn on if there are problems with the electrical network at home or the common antenna.
- damage to the cable;
- breakage of the socket;
- problems with the power grid.
- Plug the TV into a different electrical outlet and boot it up right away.
- If you cannot turn on the equipment, then check if another electrical appliance is working from this outlet.
- When there are no problems with the operation of another device, and the television device does not turn on, then contact the TV master.
Another reason that the old model LV does not turn on may be a blown fuse.
When the light is on in a normal color (red, green, blue), it is possible that the TV is not communicating with the TV signal source. In this case, you need to start the monitor standby mode and try to open any media file on the large display from a smartphone or flash drive that is connected via USB or HDMI. So you can make sure whether Smart-TV works or not.
Time negatively affects boards, transistors, capacitors, fuses and other spare parts for a TV-set. To concretize the cause of the malfunction, the device should be disassembled.
Important! When you suspect a technical malfunction of the TV, it is recommended to contact an LG service center.
The breakdown of complex electronic equipment is always costly. the cost of repairing plasma or LCD screens often turns out to be completely unprofitable for the owner. When your LG TV won’t turn on, don’t immediately suspect the worst. Most likely, the causes of problems are elementary errors or accidents, which are quite easy to eliminate.
- Lack of power supply. If no power is supplied to the TV, it will not work. An indirect confirmation of the problem can be a complete lack of indication on the case, lack of reaction to the remote control signals. It is worth checking if the button on the surge protector is not turned off, if the connection is made through it, make sure that there is a plug in the outlet.
- The mode is selected incorrectly. In the case of switching to Sleep Mode, the screen goes out, but the device itself continues to function as usual, only without external manifestations. You can make sure that this is the case by pressing the Standby button on the remote control. the TV will not respond to other commands. Only when changing modes will the device be ready for use again. Do not use the “sleep” function too often, in this state the equipment is more vulnerable to short circuits and other network failures.
- Wrong signal source. Sometimes the TV itself is turned on, but it is impossible to watch live TV or other content on it. Checking the signal source is usually enough to fix the problem. Instead of TV, there can be HDMI, AV. You just need to go to the correct mode.
- Protection against unauthorized access is activated. In this case, the TV cannot be controlled from the buttons built into its body. But from the remote control, all functions will work. The option is positioned as “child protection”. they will not be able to turn on the equipment themselves.
- Lost brightness settings. If, by setting this parameter, the user has chosen the minimum values, the screen will remain black. In this case, you need to perform the adjustment and return to normal brightness values.
A detailed study of the manual supplied with the TV is usually enough to fix most user errors: it lists many common problems.
Why LG TV won’t turn on and what to do?
When the LG TV does not turn on, its owners immediately set themselves up for expensive repairs and related expenses. The reasons why the indicator flashes before switching on and the red light is on, there is no signal at all, can be different. from user errors to technical failures. What to do, how to troubleshoot if the TV does not want to turn on. these issues should be dealt with in more detail.
Among the technical faults, due to which the TV does not respond to the switch-on command, fuse breaks are most often detected. They are designed to protect expensive equipment from voltage surges and, for obvious reasons, can burn out. If this happens, the TV turns off, does not respond to commands from the remote control and buttons for a long time, you need to contact the service center specialists for a more accurate diagnosis.
How to fix LG TV Standby Light On But Won’t Turn On || lg tv wont turn on red light flashing
The reasons why LG TV equipment does not turn on may lie in other technical malfunctions.
- Damage to the power supply. It is located inside the case, in case of failure, it can give such symptoms as a long screen load, extraneous sounds (clicks, whistles), an intermittent indicator signal. it blinks, the contact is unstable. A breakdown can be associated with overheating, overload, power supply burnout. And also after a strong voltage drop, a thunderstorm, a protective blocking against a short circuit may work.
- Software glitch. If an error is found in the firmware or the user himself has violated the correct algorithm, the TV goes into an eternal reboot mode, does not respond to other commands. This sometimes happens when updating the TV system to webOS. If this happens, you need to download the correct version to an external data storage source and install the update from it manually.
- Malfunction in the backlight or matrix. At the same time, the logo does not appear on the screen when loading, there are stripes or light spots on the dark panel, cracks appeared on the glass. Sometimes there is sound, but the picture is not broadcast.
- The remote control does not work. In this case, the indicator on the body flashes in a regular manner, the buttons on the TV itself turn on and switch functions. Commands do not pass from the remote control.
- Unstable voltage. In this case, the indicator glows red, flashes intermittently (in normal mode, this happens before the image on the screen turns on). The power system of the TV signals a weak current in the network, it is not enough to display the picture.
LG TV does not turn on, indicator blinks in red
LG TVs stand out for their advanced matrices and high functionality. Unsurprisingly, the majority of users purchase products from this brand. But sometimes there are complaints that the LG TV does not turn on, the light is red. Various breakdowns can cause this problem. In the future, we will consider all of them, note which ones can be eliminated on their own, and in which situations you cannot do without the help of a master.
It does not matter plasma or CRT TV, breakdown can manifest itself only in the following ways:
- the screen will not light up although the indicator is on or flashing as usual;
- the indicator, when turned on, immediately lights up and goes out;
- after starting, there are clicks, unusual sounds.
You need to search for a malfunction in stages. First of all, we inspect all external elements, and only then the internal details. We start with the remote control, which often breaks, and the power cable. If you have the skills, you can open the TV and inspect the internal elements. If no damage is visually visible, then the diagnosis should be carried out by specialists.
It should also be noted that LG Smart TV models running on the webOS platform may break due to a software error. It happens that this is after an unsuccessful installation of the update.
The problem is solved quite simply. a working firmware is installed from the flash drive. Any user can handle this. We carefully study the instructions for the TV, get acquainted with the recommendations on the Internet. If they are categorically not confident in their abilities, then it is better to immediately call the master.
The indicator is on, but the TV does not start
Quite often, users wonder why the LG TV does not turn on, although the indicator is on. This happens when the device is in standby mode, it must be turned on. For these purposes, we use the control panel or press the button on the device itself.
If the TV continues to ignore the commands, and the control panel is in a completely healthy state, then the breakdown is associated with the power system:
An example of swollen capacitors
This is what the fuse looks like
In such a situation, the power supply may indicate that energy is being supplied, but there is not enough energy to start the device. In this case, you need to contact the service center, unless of course you have the knowledge for self-repair.
No indication at all
If the TV is connected to the mains, but does not show signs of life, most likely, it will need to be taken for repair. However, beforehand, pay attention to the following factors:
- Power button.
All models are equipped with a power button. It is located near or close to the power indicator. To turn on the TV, just press it. After that, the indicator should start to glow red or green, and the device itself will respond to commands from the control panel.
- Sleep mode.
LG is concerned about its customers by making its devices as economical as possible. Therefore, the latest models have a power saving mode. It activates automatically after a few minutes of inactivity. Sleep mode is also triggered if an inactive AV / HDMI / TV connector is running.
- Power supply voltage.
Check that the outlet to which the device is connected is working. Connect another electrical device to it or use a screwdriver indicator. If special protective devices against voltage surges or extension cords are used, be sure to check their functionality. over, you need to check not only the devices themselves, but also the wires.
If all these actions did not give a result, then the TV requires professional diagnostics. It is possible that the power supply has failed or the motherboard has broken.
Now let’s figure out what to do if the LG TV does not turn on, but the indicator is flashing. In almost all LG models, the indicator flashes red several times before the image appears. If the picture still does not appear on the screen, most likely the problem lies in the voltage.
For stable operation, the TV must be connected to a network with a stable voltage of 220V. Regular jumps can help the protection work. Even if the subsequent voltage is brought to the required value, the device will not turn on. It will need to be completely disconnected from the network for 30 minutes and then re-started. Although this approach will not help with all models, in some, only the master will be able to disable the lock. You can avoid such problems by installing special protective devices, for example, a voltage stabilizer.
If, when starting the TV, various specific sounds, clicks are clearly audible, the display does not turn on for a long time, then:
- overheating of certain components has occurred;
- an overload of the power supply has occurred;
- the power supply is completely broken.
a safety lock has been triggered, this can happen during a thunderstorm.
The fuse could well have blown. over, such a breakdown is typical of all LG TVs.
Quite often, a breakdown occurs after a severe thunderstorm, since it is during this period that strong voltage surges are observed. As a result, a safety interlock is triggered, preventing serious damage to the microcircuits. Only specialists can repair the TV.
Checking web sources
It is performed to determine if the problem is with web sources. To do this, use the remote control by pressing the “Menu” button. If it is displayed on the screen, then the TV is in good condition, and the problem is related to sites such as SAT Box, Cable Box, DVD player, Amazon, Roku and others.
You should double check the above information source web pages to make sure they are working properly. To do this, it is recommended to turn them off and then turn them on again. This will solve the temporary connection error and black screen problem. If this does not help, you need to try connecting another web source to the TV, or the same source, but on a different TV. This will allow the user to find a likely solution to the failure.
Restoring your Smart TV to work should begin with diagnostics. It is extremely important to install the failed hardware section in time. There are times when at first the light diode shines green, but literally a couple of minutes later, the blinking becomes red. This code indicates a breakdown of internal components. Once connected, the processor sends a signal to the appropriate blocks. If at least one of them does not give an answer, the technological process is suspended. The TV will not light up until the damaged unit is repaired.
Diagnostic work should be carried out with the involvement of specialists. It requires not only knowledge, but also the appropriate equipment. However, before contacting the service department, it is recommended to perform a simple check of the correct operation of external components, power lines, indication and communication.
Reboot the TV
When the above solutions still fail to fix the problem on the machine, try the latter before requesting a professional service. Resetting TV settings will delete all settings, erase data, save you from errors and malfunctions of the device. This will likely fix the black screen error the user is experiencing on the Samsung Smart TV. To reset TV settings, follow these steps:
- Press the menu button on the remote control.
- In the main menu, press “Settings” and “Enter” on the remote.
- Go to “Support” and press “Enter”.
- Click on a support option such as “Samsung black screen”.
- Select the self-diagnosis option and press “Enter”.
- On the self-diagnosis page, select “Reset” and press “Enter”.
- After selecting the “Reset” option, you will be prompted to enter your PIN. If it was changed when setting TV, enter the correct one and press “Enter”. Otherwise, the manufacturer’s PIN is “0000”.
- After which TV will start loading.
- Follow the onscreen instructions to set up your TV.
- After this procedure, a possible solution to this black screen error will be found. However, if the problem persists, the user can seek technical assistance on the manufacturer’s profile website.
Problems of TVs of different brands
Most plasma TVs are manufactured by three well-known brands: Samsung, LG, and Panasonic. Typically this is a flat panel plasma display (PDP) that uses ionized gas or plasma to produce images on the screen. These device designs have their own differences, but many of the basic setup operations are similar.
If there is no picture and no sound on the plasma TV, the standard steps to take to troubleshoot the problem are:
- Turn off the TV and unplug it from the cables.
- Wait 5 minutes for capacitors to discharge.
- Disconnect the connector going to Z-Sustain and then reconnect the TV.
- Check the sound. If there is sound, then the Z-sustain fails. If not, continue with the following steps.
- Unplug the TV and wait 5 minutes. Then disconnect Y-Sustain and reconnect Z-Sustain.
- Plug the TV back in and check the sound. If there is sound, then there is a problem with Y-sustain.
- If the error occurs due to Y-sustain, then you need to check the buffer.
- Turn off the TV and wait 5 minutes for a full discharge to occur and the LED cannot blink.
- Clear the buffer and check if there is an image with sound.
- If TV has two buffers, detach the top buffer and see if there is an image on the bottom screen.
- Then turn off the lower buffer and see if the image appears on the upper screen.
- If, after removing one of the boards, the user sees an image, then there is an error in the removed board.
Turn off power saving and sleep timer
A black screen may appear due to the user accidentally turning on the sleep timer or power saving mode. The timer function can automatically turn off the TV after a set period of time. Power saving mode can also cause a similar problem in Smart TV.
To resolve the black screen error on the TV, you will need to disable these features. To turn off the sleep timer, do the following:
- Press the menu button on the remote control.
- Select “System” and click on “Time”.
- Select “Sleep Timer” and turn it off.
On the other hand, in order to turn off the power saving mode, you must follow the steps described below:
- Using the remote control, press the menu button.
- Go to settings on TV.
- Select a power saving mode and turn it off.
If the above solution still does not solve the problem, proceed to the next step.
Correct TV setup
A custom TV may exhibit a black screen problem due to incorrect TV input settings. The voltage source may also not turn on the power. Therefore, the user needs to ensure that the inputs are set correctly. Using the remote control, press the “Source” button to see the available inputs and go to their settings.
Also, make sure the component that can be used at the moment is selected for the TV input. Additionally, you can try switching to all TV inputs one at a time to make sure the component is properly connected to the correct input. Thus, the user can solve the black screen problem, for example, in the device in the Samsung Smart TV.
The TV does not turn on, there is an indication
The indicator changes color to green, but nothing happens
The situation is ambiguous and can have many reasons for this behavior. In order to make sure that the main board is working, the supply voltages are measured and the commands to turn on the power, backlight, etc. are examined. Perhaps, when you switch the TV to a channel with a tuned program, a sound will appear, and this already suggests that the cause of the malfunction most likely lies in the inverter or power supply unit with LED backlighting or in radiation sources.
If the LED (light bulb) indicates the operating state, but the power-on commands are not received from the motherboard, the system does not respond to the buttons and the remote control, the software of the memory devices on the main board may fail. There are situations when the processor issues a command to turn on the power supply, but does not start the inverter, or issues a Dimm command, which determines the brightness of the backlight, in the absence of an On / Off command. In this case, updating the software, firmware helps to return the normal sequence to the logical processes occurring on the motherboard.
In some cases, the appearance that nothing happens when turned on can be created by the motherboard, blocking the supply of signals to the matrix controller or transmitting such information in which the screen remains dark. The T-con itself may be faulty, as well as the LCD matrix itself. Each option is considered and diagnosed separately. At the same time, the backlight turns on, but has a weakly pronounced character due to the underestimated image brightness.
The indicator (light bulb) constantly blinks chaotically
This state of the device only indicates a malfunction and does not contain significant information about possible problems. It is necessary to diagnose the entire device, starting with checking the power supply and secondary converters on the system board. Further, the buses for the exchange of information between the processor and memory microcircuits, the sending of commands by the processor to turn on and the processing of these commands by the peripheral components of the television chassis are investigated.
The indicator changes color to green and back to red
This behavior most often indicates that the processor generates a command to turn on the device and sends it to all executors. If any of the TV units does not follow the command, for example, the power supply does not turn on in operating mode or the inverter is not able to start the backlight, then the processor, without receiving confirmation that everything is in order, cancels the power on and puts the device back into standby mode. In Sharp LCD TVs, after five unsuccessful attempts to turn on the backlight, the processor blocks the startup altogether, until the errors are cleared through the service menu or until the contents of the Eeprom memory are replaced. This behavior will continue until the cause is eliminated: defective lamps replaced, inverter, power supply, or other faulty component of the TV chassis repaired.
Indicator shines red
The situation when the TV cannot be turned on from the remote control or the buttons on the device itself, and the indicator is on, is common. Usually, in such cases, they say: “The TV does not come out of standby mode.” There may be several reasons for this, but you need to start with the most obvious ones. Replace the batteries in the remote control, remember from which button the TV was turned on earlier and, if this does not help, call the master on the TV or, with the proper skill, start an independent repair of the TV.
The glow of the indicator is more or less likely to indicate the health of the power supply. However, the diagnosis of this malfunction, like most others, should be started with an analysis of the operation of this board. Checking voltages in standby mode, their stability when trying to turn on in the operating mode, measuring the level of filtration, visual inspection of parts helps to assess the health and functionality of the power supply. Electrolytic capacitors, the upper part of which has a characteristic swelling, must be replaced.
In the section “Malfunctions of TVs”, the real history of repairs of TVs with a similar manifestation of a defect is considered on the example of TVs Philips 42PFL7433S / 60, Samsung LE40R82B, Philips 20PF5121 / 58 and other models. The behavior of television sets was somewhat different, but the reason was the same. There was a change in the properties of electronic components, mainly capacitors, in which the power supply could not provide a confident start, affecting the operation of the entire system so that the indication was present, and the TV did not turn on. If in one case the malfunction was visible to the naked eye, then in the other, its localization required a long process of diagnostic measures and measurements.
The elimination of an obvious defect in the power supply does not always lead to normal operation of the TV as a whole. In some cases, unstable power supply leads to loss of information in Eeprom, SpiFlash memory chips. At the same time, it is possible to turn on the TV and switch it to operating mode only by updating the software (firmware) on the programmer. The workshop is equipped with these devices in sufficient quantity for different types and cases of microcircuits. When repairing with your own hands, difficulties may arise with firmware without equipment and a firmware database for television models, and contacting a service organization in such a situation is morally and economically justified.
Sometimes such troubles occur when there is a malfunction in the power circuits on the TV’s motherboard. Usually in this block there are several secondary sources, made according to the scheme of DC-DC converters or voltage stabilizers. An indispensable condition for the correct operation of the processor and devices associated with it is a stable supply voltage in the voltage range at which their normal functionality is ensured. In cases where these conditions are not met, the consequences can be unpredictable, and the command to turn on the device can be ignored until the necessary power supply parameters are provided.
The indicator flashes in a specific sequence
In television receivers of some manufacturers: Sony, Philips, Panasonic. self-diagnosis of the TV is provided at the moment it is turned on. As a result of polling via SDA and SCL buses, the central processor receives information about the operability of other functional devices: tuner, sound processor, memory chips, the digital bus itself, etc. If a faulty node is detected, the turn-on command is blocked, and the receiver goes into standby mode with error indication. The light indicators start blinking in a certain sequence, indicating a particular error in the device.
This self-diagnosis method allows you to quickly identify the faulty component. The service instructions for a specific model contain the so-called error codes, in which each combination of flashing indicators corresponds to possible failures of various components of the TV receiver. This greatly facilitates the life of the telemaster when diagnosing, directing him along the right path. For example, a paused 13 LED blinks on a Sony TV on a FIX2 chassis indicates a backlight problem. An inverter or lamps can be faulty, so we will diagnose them. As an example, I will give a table with error codes for Philips TVs on the Q552.1E LA chassis. The first level of errors (Layer 1) we see immediately when a defect occurs, the second level (Layer 2) can be observed if the receiver is switched to service mode.
Summing up, we can say that the behavior of the indicator light in the TV when a malfunction occurs can provide a lot of useful information for the successful diagnosis and localization of a defect in a particular unit, contributing to the successful repair of the TV as a whole.