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Answer this question I have this problem too Subscribed to new answers. Is this a good question? Yes No. Voted Undo. Score 2. That is to say, the TV screen goes black at random times and appears to be off but the sound is available and the power light is still illuminating. A troubleshooting procedure may differ for a variety of TV brands but generally will work the same to fix the problem and is as the following:.
Home Services About Jobs Contact. Get Free Quote In 2 Minutes. Name Phone Number Problem. TV screen is black Are you having any problems with your TV? The range of our services: TV diagnostics Free estimate on any order Repair of power supply board damage, Repair of backlight and voltage inverter failure Repair a failure of a control board with a processor Solution of the problem of mechanical damage to the matrix Ingress of water or other liquids and foreign objects into the device We invite you to arm yourself with basic knowledge about main malfunctions that sometimes arise during the operation of your TV.
The TV screen is black and the device shows no signs of life at all when turned on Sometimes it turns out that on pressing the power button on your TV you're not getting a picture and a sound. The TV is powered but the TV screen goes black and no sound There are many possible problems in case your TV is powered but a TV screen goes black and there is no sound. Typically the cause of the malfunction is: a problem in the internal power supply unit, which does not produce all standard operating voltages a faulty driving board a problem in the firmware a problem in the motherboard, namely in the control chips, etc.
A new set of Installation menu icons will appear. The TV will turn off automatically after a few seconds. After the TV turns off, unplug the TV power cord and then plug it in again to complete the reset process. Try to contact the manufacturer for a detailled explanation. As you mentioned, I could see screen movement in torch light and concluded image itself is fine.
Please confirm. You should test them in order to define which to change. Hi i have 42 inch LG TV which lost light but sound mornal. I took it for repair. I show the person open it and checked the power systems of the strips and said that all the LED failed He never checked all the LEDS individually but only the strips.
He the mounted 2 strips onto the failed ones. But the new LEDs he replaced left right rays from the 2 strips even now i see two lines of 18 spots.
Hi I have replaced my tv leds due to it had sound but no images and now that I replaced the backlight leds when I plug the power cord the led turn on before switching the TV on.
What could be the problem and how can I fix it.. Again the sounds is still good but no images. I will greatly appreciate any advice on how to sort this out.
If the lines went black one after another it might be the T-Con, motherboard or the connecting cables; not the backlight system. To be sure you can disassemble your TV and see if the backlight lights up entirely. My scenario: Watching TV… Suddenly a two second cracking sound not through the speakers in the TV like something burnt out no smoke or smell. Sound still working. Screen totally Black. Did you disassemble the TV yet? It could be either: — A capacitor that burnt, making one of the power unit not working anymore — The T-Con that failed, making the image disappear even though the sound is working.
Despite the screen being black because of the absence of image, do you see that the backlight is working anyway? If it is a burnt out component should I be able see the damage? If it is the power unit is that the board where the AC socket is situated?
Cheers Dene. In a dark room, you should be able to see the black screen being a bit less darker if the backlight was working, like a very thin glow. Best way is to disassemble the TV to check components with a multimeter. The power unit is often when the AC socket is yes, you will see when disassembling the TV.
But if you are not familiar with electronics be very careful as you can hurt yourself and do damage on the TV components. Even after you unplugged the AC, capacitors can still have power for some time.
I will proceed to dismantle the whole thing… Or should I first discount a component problem to save the hassle of exposing the backlight? Further: Is it possible to test a capacitor with a multimeter if its still connected to the board? Thanks for the warning anyway. Hi I have exposed the leds in the meantime— enough to visually inspect them— No obvious visual damage.
Is that relevant? About the LEDs, they might seem fine when looking quickly, but the difference between a dead one and a good one is sometime not that easy to see. Check the image from the post for example. The best way to check is to try to light on each strip with the batteries, that way you will know if they are dead or not. Hi Guilliame I have tested 2 strips at 27v, The strip needs about 31v. Both did nt light up. Can I deduce anything from this please? Well if both strips did not lit up, it is most likely like they both have a defective LED, try to have a close look at each of them to see if you see any difference.
Thanks for this, I have now tested them all individually, they are all ok, 5 strips x 12 leds, I can see no sign of damage on the power board. Is it likely to be the T-con? To go further you will need to test the power board with a multimeter to know if it is defective or not.
You can also try to see visually if you see a capacitor with a little bump. I will be very careful. Maybe, hard to say. The best test is to disassemble the TV bezel, plug the electric in and see if the backlight lights up or not.
I hurtly see the pictures but the sound is perfect. I have an LG smart. I hardly used to see any picture but after lighting for a while, the pictures would come back. But now the lighting has completely stopped coming back on even after lighting them for the whole day. I hardly see any picture despite have good and clear sound.
What might be the problem? From what I understand from your post, the backlight used to come back from time to time when you kept the TV on for a while; this would point to a defective power supply maybe a capacitor.
If a LED was burnt, the corresponding strip would not lit up from time to time. Hi, Your Tutorial is indeed of great information. There are two strips at the Top edge connected to driver board by 2 separate wires [2 X2].
One strip glows very dim to negligible light. Other strips some LED glows brightly others are dim to negligible.
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