lg 42px5d dim washed out picture

[mzone]

i have a lg 42px5d set suffers from a very dim washed out picture.

After further investigation, I have determined that unplugging the X-Sustain Main board did not change the picture quality. This leads me to believe that the X-Sustain Main board may be a fault.

My question is, would I also need to replace the Y-Sustain Main board or the Main Logic board? Unplugging the Y-Sustain board gives me a totally black picture, which leads me to believe that the Y-Sustain board is working, and that the X-Sustain board is the culprit.

My next issue, is it the X-Sustain board that is dead, or the Main Logic board is not feeding a signal to the X-Sustain board.

What would cause a very dark picture on a plasma screen?.


thankyou