Westinghouse SK-32H540S Catastrophic inverter Transformer Failure.

[Shinju]

Re: Westinghouse SK-32H540S Catastrophic inverter Transformer Failure.

So I pulled the transformer and looked under it and the board is burnt pretty bad and pretty deep.

I cleaned it as best as I could but it still is rather nasty, anyway when removing the soldiering one of the outer feet solider pads to the transformer came off. There is no copper around it, no trace running to it so I am not sure what the purpose for these 5 solider points are as they have nothing attached to them top or bottom.

this board looks to be a single sided board only.

[budm]

Re: Westinghouse SK-32H540S Catastrophic inverter Transformer Failure.

They the use the same transformer form factor with all the pins so they can have the choice of making many version of the transformer, one may have two primary windings and two secondary windings, or one with one primary winding and two secondary winding, etc. the extra pins also help to keep the transformer securely attached to the PCB.
Since carbonized PCB is conductive, you need to remove the burnt ot section so you will not have high voltage arcing in that area.

[Shinju]

Re: Westinghouse SK-32H540S Catastrophic inverter Transformer Failure.

They the use the same transformer form factor with all the pins so they can have the choice of making many version of the transformer, one may have two primary windings and two secondary windings, or one with one primary winding and two secondary winding, etc. the extra pins also help to keep the transformer securely attached to the PCB.
Since carbonized PCB is conductive, you need to remove the burnt ot section so you will not have high voltage arcing in that area.

I am going to get a new board, I found one local just waiting to hear back on it.

This one the burn is pretty bad and its over a main trace, I did power up the Panel and it worked (no back light) I just wanted to see what would happen. I can hear the 2 original transformers squealing pretty badly.

[Shinju]

Re: Westinghouse SK-32H540S Catastrophic inverter Transformer Failure.

So an update on this, so I cleaned the soot off, installed 3 new transformers and nothing. After a few seconds I hear something start to squeal on the power board, is there some sort of protection circuit that needs to be disabled or reset?

The panel still works, have picture and audio just no CCFL juice!

[budm]

Re: Westinghouse SK-32H540S Catastrophic inverter Transformer Failure.

I wonder if those two MOSFETs on the middle heat sink are OK, they drive those three inverter transformers.

[Shinju]

Re: Westinghouse SK-32H540S Catastrophic inverter Transformer Failure.

I will check those out, thanks budm!

[budm]

Re: Westinghouse SK-32H540S Catastrophic inverter Transformer Failure.

BTW, did you also get the replacement board or just the new transformers?

[stj]

Re: Westinghouse SK-32H540S Catastrophic inverter Transformer Failure.

check the blue caps

[Shinju]

Re: Westinghouse SK-32H540S Catastrophic inverter Transformer Failure.

No, I didn't get the board it sold before I could accept his counter offer unfortunately. So I took my dremel and cleaned up the burn as best as I could on the original board. So I just got 3 new updated transformers for this darfon board.

[vinceroger69]

Re: Westinghouse SK-32H540S Catastrophic inverter Transformer Failure.

also check the windings on the new transformers i had a brand new transformer that was faulty a short while ago.

[Rudy.ALvarez91586]

Re: Westinghouse SK-32H540S Catastrophic inverter Transformer Failure.

I have the same tv and I had one of my transformers go out it was the transformer in the middle bad burnt the board I replaced the middle one and I have the same problem can't watch regular tv local channels but when i go and watch a movie it shuts off in 2 secs

[Rudy.ALvarez91586]

Re: Westinghouse SK-32H540S Catastrophic inverter Transformer Failure.

so on my tv I bought the same transformer that was still in spec with the other 2 looked the same ohm ed the same from a vender in china it took three weeks for it to come in (i think it is supposed to be 4% tolerance of voltage) I cleaned the carbon off and then I soldered it in and the tv works fine now it has been running for months no problems watching tv or movies

[Shinju]

Re: Westinghouse SK-32H540S Catastrophic inverter Transformer Failure.

Mine is still dead, I did however get a whole other Westie that had the same bottom blown transformer and popped a new one in after cleaning up the board and its been working great.

I think this Westie's board is shot, not sure I want to spend 80.00 from chinatown on a new board considering I sold the other one for that price.

BUT on a good note, these TV's have a pretty remarkable looking picture for being a bottom end unit.