TV Does Not Turn On Indicator Lights Up Red

Chaotic flickering indication

When the LED glows in a chaotic manner: it blinks at different frequencies or goes out for a few seconds, and then turns on again, but in a different color, then it is quite difficult to identify the cause of the malfunction. Here you need a complete equipment diagnostics.

It is better to start with the power supply, and then move on to the main board, one by one checking all the circuit elements.

TV Does Not Turn On Indicator Lights Up Red

Red indication light

When the indicator is red, then, most likely, the technician is in standby mode. If the TV cannot be turned on at the same time, it is worth checking the operation of the main board. It is necessary to inspect all capacitors for swelling and, if necessary, replace them, after which make a control ringing of all elements with a tester. It is also useful to check the power supply using the same multimeter.

If a short circuit occurs, or one of the burned out elements has led to the AT24 memory chips (Eeprom, SpiFlash), then a software update will be required. When the installation of the software by the local interface is impossible, you will have to perform a flashing using the programmer.

If everything is fine with the main board, but the TV cannot be turned on, you should check the power circuits on the system board. It houses voltage converters, DC-DC modules and other secondary sources. The first thing to find out is the stability of the power supply in a given voltage range. Diagnostics of the board is carried out using a multimeter.

TV does not turn on for a long time

After a while, Philips TV may not start up the first time. It takes 3-4 minutes to turn on the TV, and attempts can be from 10 or more. In this case, as soon as the image starts to appear on the screen, it makes a click and turns off. Such symptoms are inherent in devices Sharp, Thomson, Rubin and Daewoo. When the TV clicks and does not turn on, this indicates a malfunction of the power supply capacitors. After turning on the power, due to insufficient electrolyte capacity, the Philips PSU goes into defense.

Why did the TV stop turning on

Breakdowns of TV sets, like any electronics, can be caused by various reasons, which can sometimes be difficult to get to the bottom of. Devices, both new and used for a long time, are susceptible to failures. For example, trying to turn on the TV receiver, you see the indicators blinking, hear a clicking sound, but the TV still does not turn on and does not work. Different models of devices may have their own “symptoms”. There can actually be many reasons why the TV does not work.

The device is locked after switching on

The blocking pattern can often be seen on a Toshiba TV, whether it is an LCD TV or a plasma TV. This happens as follows: after 3-4 seconds, the switched on unit goes into shutdown and is blocked, and a circle starts to light in the upper left corner, and the TV does not show. To solve the problem of why the TV does not turn on, you first need to measure the voltage on the system board. If the indicators are normal, all that remains is to flash the software.

The indication is green, but the TV does not turn on

There can be many reasons for this. Perhaps, logical processes were violated as a result of accidental de-energization at the time of their execution. First of all, you should try to force a software update using the programmer. After flashing, logic processes should return to normal sequence.

Next, you need to check the performance of the main board: ring the main elements, make sure there is sufficient and stable voltage, and also inspect the backlight parts. If there is no image on the screen, but there is sound, then most likely the cause of the malfunction is the inverter or the LED unit responsible for supplying power.

Sometimes the motherboard blocks the reception and transmission of all signals to the controllers, or sends incorrect commands, in which the matrix remains inactive. The latter may also be faulty.

Ultra-budget models are equipped with far from the most adequate TCON microcircuits. They receive commands from the controller and are responsible for converting signals for the LCD matrix. In some cases, a complete flashing of the chips helps, taking into account the specifics of the main board of the TV.

TV beeps

There are times when the TV beeps when turned on. When the whistle appears for a short time after switching on, this indicates a faulty power supply unit (power supply unit). Capacitors that have lost their capacitance can cause this sound. After some time of operation, the sound may become constant, which is a sign of an imminent breakdown of the power supply.

If the LG TV does not turn on and at the same time begins to beep, then more serious repairs to the unit will be required. Such a nuisance can also visit TV BBK, Sharp, Bravia, as well as Toshiba. Whistling may in this case be caused by the load in the secondary circuits due to:

  • burnt out line transistor;
  • closed capacitors;
  • a broken downstream chip.

In the case of a CRT, for example, a Vityaz or Rubin TV, TDKS often squeaks due to a cracked case. This can happen during long-term operation of the unit. The sound is caused by the high-voltage discharge draining onto adjacent cells. If replacing TDKS is problematic, then you can try to fill the problem area with epoxy-based glue.

Sharp 54CS-03S bipolar transistor

The display changes from green to red

Having received a signal from the control panel, the processor gives a command to the executing elements to exit sleep mode and turn on the equipment, displaying a corresponding notification on the main panel. That is, the indicator changes color to green from red.

If the notification LED on the control panel switches back to red, it means that one of the circuits is not executing the given command. Here the problem may be in the inverter, which is not able to turn on the backlight, or in a faulty power supply that blocks the start of the equipment.

In such cases, the processor switches to standby mode: the indicator lights up in red without blinking. For example, the processors of some Sharp TVs, after five attempts, put the system into a complete lock. That is, the TV cannot be turned on without resetting all parameters through the service menu or completely flashing the AT24 memory. Other models perform self-diagnostics when attempting to start until the cause of the problem is rectified.

TV set freezes

Turning on the TV receiver, you see the SmartTV splash screen display on the screen, while the indicator blinks 5-6 times and the device freezes. After that, the Samsung TV does not turn on either from the remote control or from the panel. There is a response only when you press the shutdown button on the remote control (the red indicator is blinking), but the telly does not even think to turn off. What to do? Then the only thing that can be done is to de-energize the unit.

Sometimes it does not show the TV due to a failure in the software shell. it will need to be flashed at the service center. In rare cases, such symptoms can be observed with a malfunction of the CPU, or rather its memory module.

Extraneous sounds

Very often, TV owners are faced with the fact that the device not only does not turn on, but also emits extraneous sounds. In this case, the technique can behave in different ways:

  • the relay clicks, the LED blinks, the TV does not start;
  • the indicator is off, the TV receiver pokes, or clicks are heard;
  • TV beeps, whistles, does not turn on.
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The most common in the above situations are the following reasons.

  • The blocking was triggered. If some components of the TV break, for example, the power supply, a protection is triggered that prevents the device from turning on. This helps to avoid more serious damage. It is the blocker that makes clicking sounds when the TV receiver tries to turn on.
  • The plastic parts of the television cabinet heat up and cool down. Even a working device can produce SIMilar sounds.
  • The TV receiver may emit a warning squeak or whistle if a signal source is selected on it, but the device is not used for a long time.
  • The TV panel can also make clicks when the power supply is under severe stress. In this case, the problem is most likely related to the transformer, transistors, or microcircuit. To solve it, you should contact the service center.

Indicator is off

If the TV set does not work and the LED is off, this indicates a lack of power, since if the indicator burns out, the TV would function properly. In this situation, it is necessary to check all possible household reasons. lack of light, disconnection of machines, tightness of the plug to the outlet, etc.

Another reason why the indicator does not light up is the disabled “Power” button, which the manufacturer usually places on the bottom, side or back of the TV panel. While it is in the off state, the user will not be able to turn on the TV from the remote control or control buttons on the device. It is necessary to return the toggle switch to the working position.

Sometimes the problem can be more serious. So, on CRT TVs Daewoo, Thomson, Gorizont, Rubin, Vityaz and other manufacturers, as well as in modern plasma and LCD TV sets made by LG, the fuse may blow. To fix the problem, you need to replace the part with a new one. You can do this on your own or use the qualified help of a telemaster.

No voltage

The absence of voltage is easily identified by the indicator, which is off. To make sure the TV is working properly, you just need to move the device and plug it into a different outlet. If the technique has worked, then you should find out why the power did not come to the TV set earlier. it may be a lack of light, disconnected machines, a faulty outlet or extension cord to which the TV panel was connected.

Broken processor

Modern televisions are equipped with a huge amount of electronics that are controlled by a central processing unit. In the event of a short circuit or burnout of a node on the board, the device will stop working. It will not be possible to solve the problem on your own; to eliminate the malfunction, you need to contact the service center.

Backlit matrix breakage

Even on TVs of the most famous and most reliable manufacturers, the backlight and matrix breaks down. Such a malfunction is signaled by the presence of sound in the absence of an image, light or stripes on the body, a “web” on the screen. To fix the problem, contact the service center.

Faulty wires

If the outlet to which the TV receiver is connected is working properly, and the voltage is not supplied to the device, you need to inspect the TV network cable. It may have been killed or damaged by pets. Even if the power cord looks intact, you should replace it with another one and try to turn on the TV again. The wire may have been damaged internally. under the outer insulation.

Incorrect mode selection

If the TV turns off and does not turn on, or goes into sleep mode and does not come out of it, this may indicate that the user mistakenly or deliberately chose the wrong operating mode. To solve the problem, you need to reset the TV receiver to factory settings.

The TV does not turn on. causes and their elimination

Like any technical device, TV panels sometimes stop working. Malfunctions can be very different, but the most common problem is when the TV does not turn on. There can be many reasons for this: from a lack of electricity to a broken processor. For a clear understanding of what to do in this case, you first need to find out what exactly caused the problem.

The problem is electronics

In some cases (very often this happens with Philips TVs), the device does not work due to the failure of electronic components. Resistors, capacitors, or other elements may burn out. Repair of the product in this situation should be entrusted to professionals.

Samsung smart TV

Common problems with Samsung TVs include unable to turn on, signal detection, power-on delay, and no picture and sound. Other errors: fast shutdown, screen flickering, faded images and capacitor leakage, after which the board may burn.

A defective capacitor may cause a power-on failure or cause the TV to pop repeatedly at startup. A faulty cable box or satellite can cause signal detection failure, resulting in a noticeable delay between changing channels or searching for an image on the screen. Defective capacitor on power supply makes Samsung TV take a long time to start up when turned on.

A defective fuse on the wrong input channel will make it impossible to display images when the unit is turned on. The TV cannot play sound when there is no power. If the TV has programming irregularities, it turns off for no reason. Firmware that is out of date can also cause this error.

A worn out jumper on the power supply causes the screen to flicker. Problems with LCD technology or poor TV settings can cause Samsung TVs to show deep blacks and discolored images.

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.

The TV does not turn on and the indicator is on / blinking

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. Use the remote control to press the Source button to see the available inputs and go to their settings.

Also, make sure that 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 Samsung Smart TV.

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 are:

  • Turn off the TV and unplug it from the cables.
  • Wait 5 minutes for capacitors to discharge.
  • Disconnect the jack going to Z-Sustain and then reconnect the TV.
  • Check the sound. If there is sound, 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 complete 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.

Smart TV firmware update

Updating your Smart TV software will not only allow you to get the most out of it, but will also solve most of the problems associated with it. The appearance of a black screen on TV is one of the errors that can be solved by updating the device firmware. To do this, follow these steps:

  • Press the menu button on the remote control.
  • Go to “Settings” and click “Support”.
  • Click on “Software Update”.
  • Select “Update parameter now”.
  • Waiting for TV to go through the process and new updates to be downloaded and installed on it.
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After the update is complete, the device will automatically reboot, the remote control will flicker and the black screen problem will most likely be fixed.

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.

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 resolve the black screen error the user is experiencing on the Samsung Smart TV. To reset TV settings, do the following:

  • 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 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 website.

Checking if the cable is connected correctly

Many users understand that there is a problem when the LED constantly blinks in different colors, while the TV does not turn on. In this case, it is required to check the functionality of the main control blocks. If the indicator flashes randomly, without a specific sequence, then this also indicates damaged hardware units.

Non-working external nodes also cause the TV screen to be black. This is due to the power line of the device, which needs to be checked first. First you need to make sure that the correct cable connection is established between the external sources and the TV. This will let the user know if there is a connection problem. Therefore, it is necessary to disconnect all cables from the device, reinstall them tightly and reconnect them correctly to prevent loose contact. In addition, you need to make sure that the power cable and PSU are in good working order.

After completing this stage, they begin to check the functionality of the cables in order to understand whether they are working or showing a malfunction. Coaxial cable and HDMI should be in good condition. If the user finds a damaged cable, they need to take another one and check if the problem is solved. You can also try switching from one HDMI port to another to see if the port will work well. If he still does not respond, be sure to proceed to the next stage of diagnosis until a solution is found.

General problems

The main malfunctions associated with the inability to turn on the TV can be divided into four categories:

  • The power light is on or flashing, but the device does not respond to the power button.
  • The diode on the device lights up red, but it does not respond to pressing any buttons.
  • The indicator is off, the TV does not turn on.
  • When you try to turn on the TV, it starts to make uncharacteristic sounds and does not turn on.

Despite the fact that most types of such equipment have a different design (namely LCD, plasma or electron-beam), due to design differences, they can also differ in size. But the above problems and methods of solving them are suitable for any type of device.

The TV does not turn on, the indicator is off: possible causes and solutions to the problem

Any equipment fails over time or malfunctions begin. This problem also applies to televisions. It may be that when the power button is pressed, the relay clicks, the indicator lights up red, the TV does not turn on. The reasons for the breakdown and the symptoms can be different. on all of this below.

What to do if the LED is on and the TV won’t turn on?

There are times when the Toshiba TV does not turn on, but the indicator is on. It is logical to assume that the glow of the lamp on the device means that electricity is supplied to the control unit. If problems with turning on the TV occur when using the remote control, it is worth checking if everything is in order. Try to turn on the device using the button on the case.

If the TV turns on, you should make sure that the remote control is working properly. First you need to find out if the batteries are dead in it, if their contacts are oxidized. Inspect the IR transmitter for dirt or damage. Disassemble the remote control to clean it.

If the remote control is filled with liquid, then it is necessary to return it for repair or replace it. If the device cannot be turned on from the button on the case, this may be due to two reasons.

What to do if the indicator is off, the TV does not turn on?

This type of malfunction is caused by a lack of power in the electrical network of the device. It may be that even an expensive Samsung TV does not turn on, the indicator does not light up, but the problem may be not only in the device itself. First, it is worth analyzing the possible causes of malfunctions in the device, which you can solve yourself:

  • No electricity is supplied to the outlet. The wire, the outlet itself, or the machine in the panel is SIMply turned off. It is worth making sure, if possible, of the integrity of the cable, testing the outlet, for example, using another device or turning the machine on and off several times.
  • Damage to the extension cord. If you use an extension cable to connect to the power supply, and the Philips TV does not turn on, the indicator does not light when connected through it, you should try to connect the TV directly to establish that the problem is caused by it.
  • The power button on the TV is not turned on. A SIMilar problem can only occur when using the remote.
  • Another mode is on. It is possible that the previous use of the TV, it left the active mode AV or HDMI. Due to the lack of a signal, the device goes to sleep.
  • One of the components is defective. To diagnose such a problem, it is better to seek help from specialists so that they test the performance of all components of the device and, if necessary, carry out repairs.
  • Blown fuse. Fuses are now mostly found on older devices. So, if your old Samsung TV does not turn on, the indicator does not light up, then you should check the condition of the fuses. If necessary, you can replace burnt.

What to do if the diode blinks and the TV does not turn on?

Most modern models, having detected some kind of error, transmit its code by this blinking. Usually, you can understand what is wrong by the number of flashes. Information about the error code can be found in the user manual or on the official website of the manufacturer.

If the TV is connected to a computer or laptop, it is possible that the PC has gone into sleep mode. Accordingly, the TV will blink to indicate that there is no signal. To do this, you need to move the mouse or press any key on the keyboard.

Damage to processor or control unit

The TV may stop turning on due to a short circuit on the board. In the event of such a malfunction, it is categorically not recommended to undertake self-repair. Better to contact the service. Unqualified repair attempts may cause irreparable damage to the device.

What to do if the TV does not turn on, the indicator is off, and you hear extraneous sounds?

In some cases, when trying to turn on from the TV, clicks, hum and other noises are heard. The most common causes of these sounds are:

  • Protection system. It is triggered by various malfunctions of the internal components of the device. It is she who clicks, disconnecting the electrical circuit of the TV.
  • Clicks of the case immediately after switching on or off are associated with heating or cooling of the case. This is absolutely normal for any TV.
  • Overload in the power supply. In this case, it is necessary to call the specialists of the service center, since this problem cannot be solved independently.
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Protection triggered

Such malfunctions can be caused by a normal voltage drop or a power outage while the TV was in sleep mode. Also, a SIMilar problem can manifest itself in the form of a short-term turn on of the TV.

So, the TV does not turn on, the indicator is off. What to do? To exit this emergency mode, it is enough to disconnect the device from the power supply for a while. It is likely that after a while, the device will recover. If power surges or power outages occur frequently enough, it is better to purchase a stabilizer or an uninterruptible power supply. As a last resort, you can use at least a surge protector.

If your Philips TV does not turn on, the indicator is off or it makes strange sounds. this does not mean that the cause of the malfunction is in the device itself. When such situations arise, there is no need to panic. It is better to diagnose the device for breakdowns and solve the problem yourself, if possible. In the event that the components of the device itself are faulty, then without hesitation you need to contact the specialists.

The TV does not turn on, there is an indication

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 start 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 television chassis repaired.

The indicator (lamp) blinks constantly randomly

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.

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 indicates 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 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 that determines the brightness of the backlight, in the absence of an On / Off command. In this case, software update, firmware help 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. The backlight turns on at the same time, but has a weakly pronounced character due to the underestimated image brightness.

The 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 wizard on the TV or, with the proper skill, start an independent TV repair.

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 an 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 the loss of information in the Eeprom and 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 interrogation via SDA, 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 unit is detected, the turn-on command is blocked, and the receiver goes into standby mode with error indication. 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 blinking 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, 13 paused LED blinks on a Sony TV on a FIX2 chassis indicate 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 give 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.