WESTINGHOUSE SK-32H540S Transformer board damage

[lilmonk3]

My nephew just was given a Westinghouse tv by a guy that was moving out of his building.. He told my nephew that it had a blown chip (transformer) and he tried to replace it and screwed it up.. Nephew sent me the pic of the board and it looks like the guy pulled the solder pads.. Nephew wants to know if I can help him fix it... After seeing the picture, I am not sure I can.. I figure we could some how run a jumper over to the trace line.. I dont see a trace line near the solder point.. Anyone willing to tell me what can be done?? He wants to fix this, because someone broke in his apt. and stole his... He just brought me the tv and I have pulled the transformer that it looks like he replace.. Boy he has booger this thing up. I have attached a pic that the nephew sent me earlier before I pulled the chip.. I am going to take some more pics after my little one goes to bed.. Leg 1 and 5 is where the pads are missing. And one other one that is partially.

[lilmonk3]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

Wow I am thinking this is bone yard material.. Here are the pics of the pads missing after chip removed.. Is there any hope for this board?

[selldoor]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

Doesnt look much of a problem to me ( famous last words) but its not me that is doing it.

First thing would be to test all three darfon tranformers ( what part number are they)
Test Meter on 2000 ohms ( May need to be 20000 if it goes off scale)
Test and record the secondaries - may be as in the attached pic though we have had a few odd ones lately.


EDIT haha it is an odd one see here
https://www.badcaps.net/forum/showthread.php?t=21240 post 58

Also perhaps you can help identify a cap - can you have a look at yours for a
Big Blue Cap see post 65 in that same thread.
Two on the go at the same time may be able to help each other out.

[woaimi]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

that's right selldoor, it's exactly the same with the one I'm working on. Now that we have 2 threads on this board, it should get more attention.

[lilmonk3]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

Trying to clean up or shit can some on going projects.. The solder pads on the board are GONE for pins marked NC.. So are these live pins and need to have the pads repaired??

[high-tech]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

The pins marked "NC" are not used for anything other than helping hold the xformer in place

[budm]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

This is bad that you and high-tech are having the same burnt out board at the inverter transformer, there must be a lot of the same failure boards out there.

[lilmonk3]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

The pins marked "NC" are not used for anything other than helping hold the xformer in place

Thanks High-tech.. I will be watching FB on this thing by Sunday, or its going to E-waste... Need to make room for some new projects

[lilmonk3]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

This is bad that you and high-tech are having the same burnt out board at the inverter transformer, there must be a lot of the same failure boards out there.

yep bud.. The forums are littered with these POS..

[lilmonk3]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

Grrr.. got the transforms in and everything hooked up... LOgo comes up and antenna cable menu.. Then black screen.. Time to do me research

[budm]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

That is the same symptom as high-tech is having. I will have to sit down and trace out the board to make the diagram and see where to look next, bad lamps can still be the possibilty.

[lilmonk3]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

I looking at this thread and going to do some stuff suggested there https://www.badcaps.net/forum/showthread.php?t=21240

[budm]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

Now I remember this one that I did draw up the diagram, I still do not know the end of the story yet.

[lilmonk3]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

I just pulled the 3 moffs off and all 3 are OL on every pin

[lilmonk3]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

Just tested bridge.
1-2 =3.05
1-3= 2.82
1-4= 4.58
2-3= .708
2-4= 1.82
3-4= 1.94

Mosf.

OL on all 3 legs of all 3 Mosf.

Based on this pic.
https://www.badcaps.net/forum/attach...2&d=1342117417

[lilmonk3]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

Bridge is on board and mosf.. Pulled

Just tested bridge.
1-2 =3.05
1-3= 2.82
1-4= 4.58
2-3= .708
2-4= 1.82
3-4= 1.94

Mosf.

OL on all 3 legs of all 3 Mosf.

Based on this pic.
https://www.badcaps.net/forum/attach...2&d=1342117417

[retiredcaps]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

The solder pads on the board are GONE for pins marked NC.

NC = no connect

[retiredcaps]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

Just tested bridge.
1-2 =3.05
1-3= 2.82
1-4= 4.58
2-3= .708
2-4= 1.82
3-4= 1.94

In the future, when reporting measurements, always report the units with it (k, M ohms, etc). I'm assuming from the above none are shorted.

[lilmonk3]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

Sorry about that .. Its M ohms

[lilmonk3]

Re: WESTINGHOUSE SK-32H540S Transformer board damage

Well after hooking everything back up .. I pulled some readings and my head is starting to hurt.. Starting with `12.5v moving to the right.. First numbers are with AC plugged in and second set is plugged in and power button pushed.
12.5=1.3----12.10
12.5=1.3----12.11
GRD= MINUS 0.05---MINUS 12.9
GRD= MINUS 0.04---MINUS 11.3
5VS= 4.87--- 4.92
5V= 2.1--- 4.90
5V= 2.1--- 4.91
5V= 1.9--- 4.89
GRD= MINUS 0.03---MINUS 13.0
GRD= MINUS 0.04--- MINUS 11.2
PS_ON= 22.7--- 4.48
BL_ON= 11.1---4.86
V_PW= 2.84--- 163.6