Question about RCA PHD42600 42 in. Plasma Television

2 Answers

My tv I got for free from a customer (I am a mobile mechanic) the tv turns on and the sound is good but the picture goes bad after about 2 min or so some times it goes grainy and other times it just shows whight but still has sound ......I bought a video processihg board on e-bay and installed it with no change but it could be that the board I bought was bad also .......by the way the onscreen menu shows up perfect even when the picture is at its worst ..............................this model does not have a onboard tuner and i have tried differnt cables and differnt dvd players and vcrs

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  • brodymchaffe Feb 03, 2010

    I would think the cmos or any other firm syle programing would be fine do to the fact the tv works fine for about 2 or 3 min some times an hour ...........the board I replaced part Number: NA18106-5007, Description: CARD, LOGIC BOARD, ...............changed nothing is this the one that goes out normally

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If it has sound but bad picture then one of the following parts is faulty, and must be tested and replaced:

The inverter is the high voltage board that provides variable power to the backlight lamp. This is the most common. When inverter is faulty you can get no picture, or a very dim picture that can only be seen by pointing a torch light with a 45 degree angle on the LCD surface from very near distance.
The inverter must be tested by reading voltages with a multimeter.

The LCD ribbon cable/LCD display and connectors.
This is quite uncommon, but happens. If the TV had been hit or moved the LCD cable may have slipped out, or the LCD connector may be damaged.

The LCD controller board.
This is the board that controls the video signal, it is difficult to test, as there is need to read determined values on IC pins. To test this board you need to purchase a service manual and follow the troubleshooting diagrams on service manual.

Input/Output Signal boards.
This are the boards where you connect the video and audio cables, if a signal board is defective, then you may get no picture on particular inputs located on faulty board.

Good luck and have a great day!

Posted on Feb 03, 2010

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Hello:
You may have to also change the Digital board also, this model has problems with the digital processing IC, Also the analog board you replaced may be defective, it is best to purchase this board new rather then used, as there are a lot of CMOS IC's on this board that could go bad from static electrical charge.

Posted on Feb 03, 2010

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