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Old 04-03-2015, 05:37 PM   #1
Join Date: Apr 2015
City & State: Irmo
My Country: United States
I'm a: Knowledge Seeker
Posts: 29
Default LG 50PT350 sound but no picture

First, I'm new at the whole TV thing. I have some experience with vintage audio but this will be only my 2nd attempt at at TV (I was able to fix a 2008 Panasonic Plasma).

When I power the unit up I get a relay click and sound but no picture at all, the screen does not light up at all. The unit accepts commands from the remote and the volume works. The problem started about a month ago, I would turn the set on and get no picture. If I turned it off then back on the picture would come on. The problem got worse and I might have to turn it off then back on 5-6 times before the screen would work. I would like to try and fix this set.

So, the Va and Vs voltages checked out as dead on. I have no idea where the test points are for any of the other voltages. I checked every fuse I could find and they all checked out.

Most of the info I can find says that the sound but no picture problem is likely a YSUS problem with either the board, the buffers or both. However I would like to confirm the problem before I start throwing parts at the unit.

Any advice or guidance would be appreciated.

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