LG 42pq30 power supply poof

[splatee]

Hello,

Picked up a LG 42pq30 plasma up that had a turn on issue. After troubleshooting the power supply found a fuse was open an replaced it. Plugged it back in and poof power supply went up in smoke. Looks like a few diodes and a couple resistors went and an IC. I had the other boards disconnected from it so those are ok. Looks like i will be needing a new power supply.

[dkneyle]

Re: LG 42pq30 power supply poof

Ah yes, the old syndrome of $50 worth of semi-conductors going open circuit to protect the 15c fuse!

[splatee]

Re: LG 42pq30 power supply poof

Have replacement power supply ordered and should be here in a couple of days. Hopefully all goes well. I really didn't plan on putting a bunch of money into this tv and the wife isn't too thrilled either.

Thank you

[splatee]

Re: LG 42pq30 power supply poof

Replacement power supply installed and working. The only thing is that there is like a peppery pixel noise on the screen. Sort of looks like pixels are not firing correct. It is not really noticeable from viewing distance but up close can see it. I wonder if the voltage needs to be adjusted slightly. Have not taken measurements. But so far so good.

[comptek]

Re: LG 42pq30 power supply poof

Check and adjust VA and VS voltages

[maxvalutech]

Re: LG 42pq30 power supply poof

Agree get vs va within one volt of what shown on rear of screen. Also look for other trimmers on ysus and take note of position now and then try a bit of a tweak for any improvement. And further just ensure control board connections ribbons clean and properly seated both ends.

[splatee]

Re: LG 42pq30 power supply poof

Thanks for the help everybody,

I adjusted the VA and VS to the voltages labeled on the panel sticker.
VA=60v was 59v
VS=196V was 191v

Y-Sus
-175v
145v

Z-Sus
80v

There was a slight improvement but still some sparkles. Not sure what else to check. I did all voltages at recommended values