Thomson TV turns on but black screen (solved)

You have just turned on your Thomson television and you notice that the screen remains black. The image does not appear, disappears after a few seconds or darkens over time? You are confused and don't know what to do. Know now that there is more or less easy solutions to solve this display problem on Thomson televisions. In this article, we will then see the possible causes of the problem and the ways to fix it.

Thomson TV that turns on but black screen: explanation of the problem

Sadly, a television failure is inevitable. However, there are some breakdowns that are more easily repairable than others. In your case, most of the time, experience in electronics is essential. This is because the components often responsible for the failure require opening the television.

Indeed, whena Thomson television turns on, it has sound but no picture, the problem may come from:

  • du backlight : slab or LED bars
  • full T-CON card and its connectors : LVDS cable or ribbons
  • of a problem of firmware

If your Thomson TV turns on but has no sound or picture, the problem is either:

  • by wrong source selection image reception. To verify this hypothesis, then try to change the source (TV, HDMI 1, etc.) by pressing the "source" button on the remote control.
  • full motherboard which is defective. In this case, you can test the voltage of its various elementary components, as well as its input and output voltage. If the measurements are not in conformity, it will then have to be replaced by an equivalent and qualitative card.
To distinguish motherboard, power board and T-CON board : - the motherboard has all the inputs and outputs of the TV. It is therefore connected to all the elements of the device. - the power board is connected to the power cable of the TV. - the T-CON card is connected to the motherboard and to the panel, it is often rectangular and is generally located on the top of the television.

Thomson television that has sound but no picture: problem solving

When your Thomson television turns on but does not display any image even though you hear sound, here is the detailed steps to follow to try to diagnose the origin of the problem and solve it :

Hard reboot the TV

The cold restart, also called "electrical reset", allows you to solve many software malfunctions such as, among others, the one you are experiencing or a starting problem.

In order to reset a Thomson TV with black screen, here's how to do it:

  1. Turn off the TV,
  2. Switch off the TV decoder if you use one,
  3. Switch off the power supply TV and TV decoder for at least 1 minute,
  4. Reconnect the power supply of both devices.
Restart the Thomson TV that turns on but the screen remains black

Wait for the TV decoder to restart. Then try turning the TV back on. If the display problem is not solved, then unfortunately a hardware failure is certainly the cause of the malfunction.

Check Thomson TV backlight

If your Thomson television turns on but does not display a picture or that thedisplay dims ou disappears over time, the problem may come from the backlight. To verify this hypothesis, there is a quick and easy test to perform:

  1. Start your TV.
  2. Point a phone flash or lamp a few centimeters from the screen.
  3. Si you see an image, the problem is definitely backlight.
  4. If on the other hand nothing is displayed, the problem certainly comes from a connectors or T-CON card. In this second case, go directly to the rest of the article.

If your Thomson television has a backlight problem, the failure may come from the From to led bars which are defective.

Unfortunately, in the case of this breakdown, it is very difficult to repair it. Indeed, very often it is necessary to open the front and rear panel of the television, check whether the problem comes from the panel or the LED bars, find the corresponding reference and replace the defective element. This therefore requires being extremely careful not to break the panel or another element of the television.

Caution: never open a television still under guarantee because that will make you lose your rights. Contact immediately Thomson after-sales service for a free repair.

Do not hesitate to be accompanied by video tutorials, online repair sites or to request an intervention from a specialist near you. Note that some repairers do not offer backlight repair because there is a high risk of breakage. And the bigger the screen, the greater the risk!

Check the connections

If the previous test has determined that the picture problem on thomson tv does not come from the backlight but from the connectors or the T-CON card, you will first need test cables and connectors.

For this you will need to open the back panel of the TV. Be sure to unplug the power cord and wear antistatic gloves beforehand. Once the panel is open and access to the electronic boards, do not touch anything before having discharged the main capacitor located on the power supply board.

Then, check that all the connectors are correctly connected. In particular, you will need to check the LVDS cable (Low-Voltage Differential Signaling), which connects the motherboard to the T-CON board and the cables (usually there are two that look like tabs) that connect the T-CON board to the slab. Also check the other connectors on the power board and motherboard. If in doubt, unplug them and plug them back in.

Thomson TV sound but no picture: check the components

If the screen remains black after that, then test the voltage of the connectors. If a voltage is not compliant, you will certainly have to replace the connector in question so that the TV display returns to normal.

Control the Thomson TV T-CON board

Finally, if the backlighting and connectors work normally, then your Thomson TV broadcasts sound but does not display an image probably due to a failure of the T-CON board. In this case, only one solution: replace card. To do this, choose a card equivalent ou compatible and qualitative. Avoid at all costs counterfeit cards that can cause you more problems.

In order to help you in handling, we recommend the spareka video :

Contact a professional repairer

contact a specialist to repair a Thomson TV that no longer displays an image

If you cannot identify why your Thomson television turns on but the screen remains black or you are unable to carry out the manipulations, we advise you to contact a professional repairer in order to save you from unnecessary costly repair or further damage.

If your TV has the right to guarantee, call on Thomson after-sales service for free repair.

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