lg 42pc3dv perfect sound, messed up picture

[gamergomer]

So I see others issues with this tv and no picture, but what about a bad picture?

My picture is dim, fuzzy, has black patchy areas (that change position, not a shattered screen). The sound is perfect. It also flickers bright. When in high power mode, it flickers about once a second. In low power consumption mode, it flickers once every two seconds.

These pictures actually look brighter than real life. The picture's pretty dim in real life:

[gamergomer]

Ok, so I took the back off today. Not a single bad cap from what I see.

But I played around with seeing what unplugging different boards and then powering it on did. I notice that there is a snapping comming from the right-most (from back) board (closeup included). The popping or snapping goes away when the board is off. It seems to be coming from the top half of the board and I thought from the left side (bad solid cap?).

I unplugged this board while running and the left picture (from front)dissapeared. The right picture looked pretty good except it pulsed. If I unplugged what I think is the problem board before turning the tv on, I just didn't get any picture at all.

Any suggestions for what's next if I want to try pinpointing the component rather than just trying to replace the whole board?

[tom66]

This is a bad Z-sustain - the board on the right, as you have diagnosed.

The problem is with the hybrid module, which is under that large heatsink. Replacing the hybrid module is difficult, but not impossible. It requires good soldering skills because of the awful design LG used with these plasma TVs.

[gamergomer]

Any ideas how to figure out what hybid module I need and are there pictures for what the job will look like anywhere?

I'm a computer tech and I've soldered and unsoldered lots of old school eproms, but I always hated things like soic. This looks like it's full size but that it's a pain because of the fact that you can't remove the heatsink beforehand.

Ok so I see these:
http://vacation-tripadvisor.com/ebay...9&site=EBAY-US

http://www.ebay.com/itm/4921QP1027P-...item19d00e5d59

Is this what I want? It looks like the same part for either side hybrid?

Is there any way to improve the design when I'm done to keep this from happening again?

[tom66]

The second eBay link is what you need. (If the pin out and old device are the same - check before buying!) You'll probably also need to replace the fuse for Vs on the board.

Hybrid failure is common on these LG plasmas. I have no idea if LG fixed it with later hybrids.