Proscan LED 32" TV not working.

[vinceroger69]

Re: Proscan LED 32" TV not working.

Voltage Regulator (LDO) testing:
https://www.badcaps.net/forum/showthr...999#post300999

[THERED117]

Re: Proscan LED 32" TV not working.

I checked the fuse and it was good. Here is the readings from the regulators.

[attainteddragon]

Re: Proscan LED 32" TV not working.

this looks like an adjustable regulator, so output should be 1.25v above ground voltage.

if it is a 3.3v regulator, (can't read bottom line on ic) then it is out of spec as well.

[vinceroger69]

Re: Proscan LED 32" TV not working.

if this was my tv i would try and source a replacement mainboard, as long as it matches the numbers on any stickers on your old main board and also matches the lcd panel used in your tv (white sticker on metal tv chassis usually) it maybe the best route too go, as you may replace that regulator then have a eeprom/spi flash ic issue etc so if you can source a mainboard at a good price with returns policy if faulty on arrival i would buy one.

[dskall]

Re: Proscan LED 32" TV not working.

Looks like input to first reg. 5.03v and input to third reg. are from same trace but different voltages.

[THERED117]

Re: Proscan LED 32" TV not working.

Sorry its been a few days. Here is what i have so far. BTW the fuse was good. Zoom in to see the readings.

[THERED117]

Re: Proscan LED 32" TV not working.

I could have bought one already. I,m being stubborn. I want to repair if a can lol

[attainteddragon]

Re: Proscan LED 32" TV not working.

well, you will need to change out that regulator to start with.

[THERED117]

Re: Proscan LED 32" TV not working.

which regulator are you talking about? Why? I'm not arguing, I'm just trying to understand/learn.

[attainteddragon]

Re: Proscan LED 32" TV not working.

the one i marked earlier as being out of spec.

[THERED117]

Re: Proscan LED 32" TV not working.

gotcha thanks. I overlooked the thumbnail.

[vinceroger69]

Re: Proscan LED 32" TV not working.

with that 3rd regulator it does seem odd that the trace at the left regulator is 5v but when it reaches the third regulator on the same trace its down too 3v volts so yes maybe double check voltage readings if still odd maybe change the regulator

[THERED117]

Re: Proscan LED 32" TV not working.

So I know it been awhile but I finely bought a board...... Problem now is the PS board. Ive got one on order but i would like to know what died. At the moment I only have one question. Is it normal for a heat sink to be electrified? IE I'm getting 60 ish VAC on the left heat sink.

[vinceroger69]

Re: Proscan LED 32" TV not working.

yes a lot of power supply heat sinks are live.

[budm]

Re: Proscan LED 32" TV not working.

So I know it been awhile but I finely bought a board...... Problem now is the PS board. Ive got one on order but i would like to know what died. At the moment I only have one question. Is it normal for a heat sink to be electrified? IE I'm getting 60 ish VAC on the left heat sink.

I would suggest you to at the very least plug what you are working on into the GFCI outlet.

[Andrew F. Ali]

Re: Proscan LED 32" TV not working.

So did you get the TV going by installing the new Main Bd you got? Did the older posts not confirm the PSU was OK? Did you mess with PSU and now destroyed it?

[THERED117]

Re: Proscan LED 32" TV not working.

I changed out the main board with no luck. When it didn't work I checked the output from my PS and and found that there was no voltage. I had voltage up to the transformer so I didn't dig into it too deep. I was going to take the easy quick way out and buy the PS. So now I have another PS and the problem is unchanged. Also there is no stand by light.

[THERED117]

Re: Proscan LED 32" TV not working.

GFCI is a welcomed idea. lol

[vinceroger69]

Re: Proscan LED 32" TV not working.

its odd as in your earlier posts the psu checked out fine but then you say its lost the voltages, so you have now replaced the main board and another psu and still same issues? i would leave your two new boards in if they are the exact same board numbers including any details on stickers etc, then i would re test all the psu voltages and post your results please let us know what it says by each pin and the voltages you are getting.

[THERED117]

Re: Proscan LED 32" TV not working.

Ok. I will as soon as i get a chance this weekend. Thanks