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Grundig LCD TV

Picture disappears after a couple of seconds. Sonud is OK. Turn off and on picture just flashes up and disappears to fullblack screen again.

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  • rdrs Aug 01, 2008

    There are no loose connections at all...

  • rdrs Aug 01, 2008

    This problem occurs regardless of the input 75Ohm /RCA /PC C51 and C55 are only in the YPrpB Interface on the Main Board Part 2.

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The problem of your LCD TV is defected inverter..

The defective LCD TV may have the following common symptoms:
Symptom: No picture on screen but LCD TV still has sound.
Solutions: The problem is cause by defective inverter. Replacing inverter will solve the problem.

Symptom: Screen flash on and off between 1/2 to a few seconds, but power indicate light stays on and TV still has sound.
Solutions: The problem is cause by defective inverter.


hope this may help;

Regards,

Posted on Aug 01, 2008

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  • Master
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The protective circuits are kicking in and shutting down the LCD section. Usually this is because of a fault in the backlight circuit. This is essentially a flourescent light that provides the backlight for the LCD panel. These are not the easiest circuits to diagnose because either they work or not. I have seen bad caps, leaky diodes and shorted transformers cause this. I am not familiar with Grundig sets enough to point to a specific component. There should be a "power" board that contains the supply for the panel. That module should be swapped. If you have access to an ESR meter, you can check the caps using that. Check the diodes with a meter too, although they may test good out of circuit and fail under load.

Keep us posted on your progress. I hope I gave you a few options.

Dan

Posted on Aug 01, 2008

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  • Master
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U need to go with a professional service technician

Posted on Aug 01, 2008

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Hello,
The fault is in the Capacitors C51 or C55 in LCD drive circuit...Please Try to replace them by yourself and if your not sure contact a service person!!...This will surely solve your problem...!!Thank you...

Please post back for further assistance...

Regards!!...

Posted on Aug 01, 2008

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  • Contributor
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Try to resolder the pins of the chroma IC and some possible lose connections you can see in the PCB board...

Posted on Aug 01, 2008

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