insignia p501q-10a MOSFET IDENTIFICATION

[topfli8979]

Hello ALL,

Im am new to the forum and I am hoping you can help me out, picked up a insignia p501q-10a. When power applied tv tries turning on then shuts off quickly with a clicking sound. Measured VA,VS all normal and holding steady, have it narrowed down to bad Y board. Y board # Lj41-05905a, I found a mosfet location Q5007 that is shorted. The problem is the part number reads "20Z" thats all! Im having a heck of a time finding a replacement, digikey is clueless. Where should I look?

[ben7]

Re: insignia p501q-10a MOSFET IDENTIFICATION

Lots of cascade failures can happen with these boards in Plasma TV's.

I would suggest a new board, and if budm or tom66 thinks something else is bad, i'm sure they will chime in sometime.

[topfli8979]

Re: insignia p501q-10a MOSFET IDENTIFICATION

Yes if I can find a board that is not $168 bucks, I would buy it. Not anything on ebay cheaper than that.

[tom66]

Re: insignia p501q-10a MOSFET IDENTIFICATION

Are you searching for the Samsung part number e.g. BN44-xxxxxx or BN96-xxxxxx? Or using the Insignia model #?

[topfli8979]

Re: insignia p501q-10a MOSFET IDENTIFICATION

I have been searching with both numbers. No luck,

[tom66]

Re: insignia p501q-10a MOSFET IDENTIFICATION

I believe this Samsung Y-main and buffer set is notorious for blowing the upper buffer and a FET on the Y-main.

You would likely need to swap the upper buffer too.

Is the FET simply marked 20Z, nothing else?

[topfli8979]

Re: insignia p501q-10a MOSFET IDENTIFICATION

Yes its a very small fet, only marked "20Z" right next to upper heat sink. I plan on replacing buffers if i CAN FIND THEM. LOL. I think parts for this model are going to be hard to find.

[tom66]

Re: insignia p501q-10a MOSFET IDENTIFICATION

Can you show a picture? Might not be a FET.

[topfli8979]

Re: insignia p501q-10a MOSFET IDENTIFICATION

I just tried with my camera, and phone. Zoom is horrible, just fuzzy picture of it. I was wrong the number on the part is"Z02" not "20Z". Its a surface mount 2 legs on one side, 3 on other.

[tom66]

Re: insignia p501q-10a MOSFET IDENTIFICATION

Not a FET, then... how are you testing it as shorted?

Possibly SOT23-5?

http://altera.theicstock.com/images_...5TR_807350.jpg

[topfli8979]

Re: insignia p501q-10a MOSFET IDENTIFICATION

Bottom left leg to top left leg,bottom left leg to middle leg. Far right leg to top right leg, which is coming through as shorted, there is two other components on the board identical to this one, and they seem to tst fine. It does seem to look like your picture though>

[topfli8979]

Re: insignia p501q-10a MOSFET IDENTIFICATION

Is that the correct way to test this component?

[tom66]

Re: insignia p501q-10a MOSFET IDENTIFICATION

If it is 5 pins, no...

There are other potential faults.

Have you tried running your set with one buffer missing and seeing if you get half a picture?

[topfli8979]

Re: insignia p501q-10a MOSFET IDENTIFICATION

I dont think I can remove the buffers they are built into the y board. This is a very odd unit.

[tom66]

Re: insignia p501q-10a MOSFET IDENTIFICATION

Can you post a picture? Not seen that before on a Samsung.

[topfli8979]

Re: insignia p501q-10a MOSFET IDENTIFICATION

[tom66]

Re: insignia p501q-10a MOSFET IDENTIFICATION

Ah, I was wrong - Indeed, I have seen this before, but it is a rare board.

Someone else had a similar issue - this may help in diagnosing your problem. It was on a Samsung plasma, but using the same parts as yours I think:
https://www.badcaps.net/forum/showthread.php?t=18434

[topfli8979]

Re: insignia p501q-10a MOSFET IDENTIFICATION

Okay I have found some shorted components on the bottom heat sink. Also tried to unplug y board and just use x sustain, Im not getting any sound, but power does stay on.

[tom66]

Re: insignia p501q-10a MOSFET IDENTIFICATION

You might not get any sound if you're not on the right input - try connecting a DVD player or games console with sound (and video as it won't make sound without a video signal) and press the Source button until you hear sound.

[topfli8979]

Re: insignia p501q-10a MOSFET IDENTIFICATION

Do I have to remove the heat sinks to get the fets out? Im not getting OL on my meter from any of the 6 of them.