It's your T-Con board (Timing Control). Is the set a KDL52W4100, KDL52W5100, or KDL52W5150? I don't see any KDL52W4150.
Look familiar? I'm a TV tech. The T-Con is the board at the top of the panel that the LVDS cable from the "Main" board plugs into. If you confirm the model#, I'll get you a part#, and the list price. You can perhaps use that knowledge to haggle. Don't let them convince you it's the panel of the "Main" board. I'd wager money on my diagnosis. A Guy