2005 fpw still dead after cap change

[lance01]

Any ideas? It blinks initially but stays black.
Replaced all the caps.
There is a transformer in the high voltage section that is suspect. However, the number PT20106 has got me stumped. Can't find that on the net.
Any suggestions?

[selldoor]

Re: 2005 fpw still dead after cap change

All the caps? Both Boards? What make replacements?

[lance01]

Re: 2005 fpw still dead after cap change

power board cap replacement plus 2 on the 'logic' board.

[lance01]

Re: 2005 fpw still dead after cap change

not sure about the make of the replacements. I think the logic board replacements I bought were panasonic.
The others are gold on black. I think they are good caps.

[jetadm123]

Re: 2005 fpw still dead after cap change

Suggest you post some good focused overhead photos of the power board top and bottom as there were different versions used on your model monitor. Use "manage attachments" to post them.

[lance01]

Re: 2005 fpw still dead after cap change

I can post pics, but I am not sure what you expect to see.
I only have a top view of the board right now - I put the monitor back together and discovered the caps didn't fix the problem and I didn't take it apart again.

There is a PT20106 that looks like it may have overheated. I can't really tell if the varnish they used for the windings melted or it was manufactured like that (the process isn't exact for transformers so there may be slight excess during mfg).
Second, it looks like one of the small transformers might have heated up too, but again - I can't tell. What I see is inconclusive - I have seen many burned parts in my day (I am an electrical engineer) and I don't see a clear 'smoking gun'. The only thing I can do at this point is start probing, but I don't have a schematic and I don't want to get whacked with 750V.

There were no bulging caps when I replaced them (top or bottom). Doesn't mean a cap was not bad, but the bad cap thing was pretty darn clear on the cheapo Princeton monitor I fixed.

Not sure what to do at this point. Got some time and a few bucks invested, but I probably should cut my losses.
Thoughts?

[smason]

Re: 2005 fpw still dead after cap change

What blinks? The backlights?
Could be a bad lamp, or a bad inverter transformer. Post the pic you have and we'll have a look

[budm]

Re: 2005 fpw still dead after cap change

"I can post pics, but I am not sure what you expect to see." You will be amazed what we can do when people supply us with good clear pictures!

[lance01]

Re: 2005 fpw still dead after cap change

You asked for pics. You got em.
Let me know if you see anything.

[jetadm123]

Re: 2005 fpw still dead after cap change

Does look like a scorch mark under the first transformer. You can test each inverter transformer as outlined here:

https://www.badcaps.net/forum/showthread.php?t=19541

[lance01]

Re: 2005 fpw still dead after cap change

Well - it looked like discoloration of the glue attaching the clear insulator to the bottom of the pcb. The transformer top side looks good.
The bigger transformer was what I was concerned with. The monitor never lights up.
Guess I will have to test it per the link you sent, thanks.

[selldoor]

Re: 2005 fpw still dead after cap change

Power OFF Meter on ohms 1000 or 2000 test S1 to S2 S3 to S4 S5 to S6
and so on up to S11 to S12 and post results