LG 50PC3D washed out picture

[drgears]

Have been playing with a LG 50" plasma tv,,,power board required 9- 10V 3300uf caps to be replaced ,,,were replaced with Rubycon caps of the same value...The good is set power up ,,,sound responds to commands,,,the bad,,,picture is there, but is lazy and washed out..the picture has no distortion lines ect ect,,,just poor color poor brightness .do not see components with issues on sustain boards,,,removed buffers ,,,no obvious shorts noted on chips...could use a little help on which component would be suspect to this issue thanks.....

[tom66]

Re: LG 50PC3D washed out picture

Bad Z-sustain probably. Can you take a picture of the board on the right hand side of the TV? It's usually marked with ZSUS. Also, it's the board that's *not* connected to the buffers; it connects straight to the display.

I repaired a TV with a fault like this; the Vsus fuse on the Z-sustain was blown. This caused the picture to appear purple and slow to update (things tended to exhibit motion blur). Replacing the fuse fixed the problem.

[drgears]

Re: LG 50PC3D washed out picture

thanks for the reply,,,FS3 fuse is on Y-SUS board,,,checks out ok...so does FS-2...had set running last night,,,noticed that one of the sinks on Z board was not getting warm,,,probably a good sign that component under it is kapoot !!!
reading Coppell tv blog symptoms as described fit to a tee,,found a used one,,,he wants almost as much as to repair,,,guess I'll have to make a decision.....Sound like your pile of broken tv's is bigger than mine!!! I'm jealous,,,,did I spell jealous right??? thanks again enclosed is pic

[tom66]

Re: LG 50PC3D washed out picture

thanks for the reply,,,FS3 fuse is on Y-SUS board,,,checks out ok...so does FS-2...had set running last night,,,noticed that one of the sinks on Z board was not getting warm,,,probably a good sign that component under it is kapoot !!!
reading Coppell tv blog symptoms as described fit to a tee,,found a used one,,,he wants almost as much as to repair,,,guess I'll have to make a decision.....Sound like your pile of broken tv's is bigger than mine!!! I'm jealous,,,,did I spell jealous right??? thanks again enclosed is pic

Quite possibly you have a bad "hybrid" (the IC under the big heatsink.) Yes, a new hybrid will cost around 80% the cost of a new sustain board, so it's not really worth replacing the hybrid. And it's a bastard to do.

Are there any fuses on the Z-sustain at all?

Yes I have a lot of TVs, but my junk pile consists of just one TV (that I haven't got around to fixing yet) - all the others have been successfully fixed and sold or are in use in the house!

[drgears]

Re: LG 50PC3D washed out picture

there are no fuses on the z board,,,all are on the y board,,,have a GOOD USED z board coming from NY,,,,, $50.00,,,I'll let you know how this turn out......it's amazing how many same but different parts are for the same tv....getting to be an expert on that tv ...Do you have a tv for every room in the house,,,including the dog's house???lol gbaum.....

[drgears]

Re: LG 50PC3D washed out picture

My "good used" board showed up,,,installed it ,,,tv picture is better ,not perfect,,,,had it running for half hour noticed heat sinks were not getting warm,,,looked things over noticed I did not plug cable P1 into the board ,,,this cable comes from control board ,,the one with the lit led's ,,upon inserting the plug (tv is running) there is a very loud pop from the z sustain board,,dog won't come in the kitchen now,,,don't think my good used board was too good ,,,so much for used parts,,,a little leary on putting in a rebuilt board ,,,and watch it go up in smoke

[truep]

Re: LG 50PC3D washed out picture

You should have turned the set off and let it sit for a few min. before plugging in the cable. You probably blew something on the board or the control board.

[drgears]

Re: LG 50PC3D washed out picture

from a cold start With my "good used" board installed this would shut the tv down upon start up,,,I have 2 power boards a known good one and the one I re-capped that came out of it,,,was questioning if the power supply had a problem so replaced the power board,,,tv stays running,,,then noticed I didn't plug in P1,,plugged it in,,,guaranteed z sustain board now has a problem for sure!!!

[tom66]

Re: LG 50PC3D washed out picture

from a cold start With my "good used" board installed this would shut the tv down upon start up,,,I have 2 power boards a known good one and the one I re-capped that came out of it,,,was questioning if the power supply had a problem so replaced the power board,,,tv stays running,,,then noticed I didn't plug in P1,,plugged it in,,,guaranteed z sustain board now has a problem for sure!!!

Not necessarily. If you plugged it in and the board was cold, the "crack" sound was probably just the caps charging up real quick. You have probably blown the fuse, just replace that and connect it before powering up the TV.

[Bullgawd]

Re: LG 50PC3D washed out picture

Where exactly is this fuse you guys are talking about? Same TV with a bad Zsus.

[tom66]

Re: LG 50PC3D washed out picture

Where exactly is this fuse you guys are talking about? Same TV with a bad Zsus.

It might be a small SMD fuse, white, about 0.12" by 0.063".

[fusionlore]

Re: LG 50PC3D washed out picture

Do you have a part number for the z sustain board?