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Logik LCXW32HD1-Standby Transformer Problems

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scooby-doo:
Hi Andy

Yes it has been turned on with U4 the wrong way round, this is when I got the flashing control panel lights, turned it back round and now I just get the very dim standby light, since my last post I have replaced U4 and still have the same fault.

Ohm Supplies:
I'd think that the scaler board is damaged from the opto, i've seen it a few times and not managed to repair the board.

regards
Andy

scooby-doo:
Hi Andy
I know its all confussing, but the PSU I am working on is the one that HASNT been turned on with U4 upside down.

Or when these boards fail is there a chance this damage will be caused anyway, judging by the fuse in this board it was a large short.

Is there anywhere else you can direct me too with my DMM to confirm this is Fubar'd

Cheers

Ohm Supplies:
Hello,

WHen the boards blow its not that common to have a problem on the scaler however the opto being in the wrong way nearly always causes problems, the symptoms are dead, all the lights on the front on permanently or if you’re lucky the front buttons not working and the remote control being the only way to get the set on. Putting a working or repaired psu in wont sort the scaler and it would have to be replaced
Regards
Andy

scooby-doo:
Hi Andy

Right I understand now, so what you are saying is I could go out buy a gleaming new psu and the problem will persist.

What I am finding hard to understand is that if I plug the PSU just using the AC plug (like you told me to do to check between c45 & C55) if I leave all other cables out of the board and check all the terminals on the board I am not getting any voltages at all just 5.10v from 5vs and 1.8v from STB.

Wouldnt there be a voltage at 12v or 3.3v or would all the other boards need to be plug in to stabilise all the other voltages.

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