50" LG PLASMA TV for Turns on but screen is grey to black w/shadows. Stereo sound works fine. Model No: 50PX1D what is the problem

SOURCE: LG 50PX4DR plasma tv

Open the back cover and check the fuse on YSUS Board. If the fuse was gone, replace the YSUS board or ZSUS board.

SOURCE: My LG Plasma TV RU42PX10C

I have the same exact TV, LG Plasma TV RU42PX10C. It has a pop sound, and now all I see are moving shadows on a dark black/gray screen. Sound is fine, powers up, tv works...only see dark shadows of the broadcast...seems like the backlight or bulb. I read that it could be the back fuses, but there are no fuses on any of the boards that are removeable without soldering and expert electrical knowledge. But I dont know for sure, any help is really appreciated. email me if you have a solution please
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SOURCE: LG 50PX1D 50 in. Plasma TV

i just had the same problem. after talking to many tv repair people i finally got a knowledgeable person to help me. i ordered the part and fixed it myself.
it was very easy. i have an LG model# 50px1d. so if you had this problem i suggest you order the part yourself and fix it. i got an estimate for repair and it wouldv'e cost me at least $500 parts and labor. i paid $230 for the part. so you can see i saved a little more than half. the part you need is the " Z SUS " ASSEMBLY. you can order the part from LG website. the part # is 6871QZH044C.
let's just say after doing everything myself, i am watching TV right now.
by the way LG would not help me at all. spread the word that LG is not a good product.

SOURCE: Purchased LG 50PX1D; 50 inch plasma TV from Best

that you internal projection lamp has failed

SOURCE: LG 50inch Plasma received loud sound then went black

I had the same problem with my LG 50 inch TV that I bought from Best Buy in Nov 2006. Fortunately I had the service plan. They had to replace the power supply board as 9 capacitors popped, so the TV would turn on them pop and go black and turn itself off. The TV has been a pain. I have the built in DVR and that has failed twice. I have had 3 repairs through best buy. One more time they owe me a new TV when they come out.