Question about Hitachi 43FWX20B 43" Rear Projection Television
My DLP is about 5 years old. In recent weeks the color has been gradually changing from what would be considered normal, to a picture with a more blue and yellow hue. It appeared to get worse over time and now the picture is very blue and yellow. Recently, I've replaced the lamp and the color wheel. Neither had any impact on the picture.
What could cause the color to shift over time that's not related to the color wheel?
Thanks in advance for any advice. only have blue and green color. set has to be on a few hours for this to happen. will come back to all colors after 15 minutes, then will be ok the rest of the night.
You are missing either red drive signal to CRT or you have a cold / fractured solder joint on the television. Also with the set unplugged check with a non metalic object like a ruler or a wooden spoon and start tapping around in the front or back of set and see what happens. See if you can narrow which area of the set has a problem... Good luck future technician.. Happy holidays.. Jay
Posted on Dec 08, 2008
Sounds like you've lost your red video signal (chroma) somewhere along the line. This tv has a 3 board video path. Analog main pcb --->Digital main pcb --->DMD pcb. The analog has all your inputs on it, except DVI and RGB which go straight into the digital board. The digital scales (upconverts) the signal to HD (1080 or native) and sends it to the DMD or light engine. See which inputs are distorted. If only DVI is clean then you problem is the analog board. If you menu and everything is distorted then suspect the DMD board. If you run component or DVI through the resolutions (480i, 480p, 720p, 1080i) you can get an idea between the digital board and dmd. The menu is generated on the digital board. Somewhere red is getting lost.
Posted on Dec 08, 2008
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