Re: LG 50PN4500 - fluctuating Vcc/18V supply on Y-sustain board causing fault

Just gave up and bought a used y-sus for $45. back up and running!

Re: LG 60PB660V Plasma tv Help Please

There's a few threads with LG panels, have a look at them - they all seem to have similar problems, mostly with the Ysus not supplying the 18v to the Zsus. The issue seems to be centered in the power supply section of the ysus board.

Re: 60PB660v Lg plasma tv- sound but no picture

Sounds suspiciously like the problem I'm having with my LG 50pn4500. there is a thread about it. Problems are in the 18v circuit. If this isn't working you won't get the status light to come on.

Re: LG 50PN4500 - fluctuating Vcc/18V supply on Y-sustain board causing fault

Thanks, I've given the board a good look over, but I'm sure my tired old eyes may have missed something.
I'll report back when I've had another go at it.

Re: LG 50PN4500 - fluctuating Vcc/18V supply on Y-sustain board causing fault

I'm chasing somewhat of the same issue. Started with a shorted cap at c204 between Vcc and gnd of Ic201 (200d6). replaced with a 50uf (original was 100) to check and everything worked for about 10min.
replaced Ic201 based on OP's xperiences as everything else seemed to test fine, as well as replacing C204 with the proper value.
Blew out the 2.0 ohm resistor and the driver FET Q202.
replaced those and IC201 again(as a precaution), and got fluctuating voltages on the high voltage pin...