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Old 04-04-2015, 06:39 AM   #3
ultimatt
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Join Date: Apr 2015
City & State: Irmo
My Country: United States
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Posts: 29
Default Re: LG 50PT350 sound but no picture

OK...sticker reads:

5v/Va:55v/Vs:205v
300v/-193V/NA/90v

took measurements and got following results -

Va=55v
Vs=205.3v

YSUS -
+VSC = -35v
+VY = 14.4v

ZSUS -
VZB=89.8v

so, I assume the 300v and -193v on the sticker are the YSUS voltages and I am way out of spec.

If I need a new YSUS board is there any way to test the 2 Y Buffers to see if I need them as well? Is there a particular resistor or transistor that fails on the YSUS that can be replaced and upgraded? I do not see any burst or swollen caps on the board.

Thanks.

Last edited by ultimatt; 04-04-2015 at 06:41 AM..
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