Question about RCA PHD42600 42 in. Plasma Television
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
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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Posted on Jan 02, 2017
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