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Logik LCXW32HD1-Standby Transformer Problems

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Ohm Supplies:
Depending on the design of boards, some psu’s are switched on by the main board, others will have all the voltages present (17pw boards are the best most common example).

You can switch most boards while on the bench by adding voltage or sometimes earthing. Not only does this mean a test can be done with out the rest of the set (although the set does not run with a load) it also tells you if the fault is on another board as is the case with this set.

If you look at the general forum on this site about the diagnostika tool, this is a palm sized device that works on this principle, simply because its how power supplies work.

We did some service info. a few weeks back showing how most engineers do this on a practical level.
Regards
Andy

scooby-doo:
Hi Andy

Cheers for all you help on this one mate, my next question is do you have a scaler board in stock?

Ohm Supplies:
Sorry no,

You can get the scaler from a scapper (it the little board on the right going to the screen and the psu) but if the psu has been repaired then it might of been damaged with the opto being incorrectly fitted.

regards
Andy

johnboy183:
Hi,
 I have also been working on one of these boards for some time now and I am not sure if I also may have unintentionally put U4 in the wrong way round. I can't easily find a photo or description of which way round it should go.
Usually the boards are marked quite clearly (with a number "1") to show where pin1 of the opto (the one with the dimple next to it) should go. However all of the other optos on this board dont seem to follow that pattern and the printed "1" is on the opposite side to teh dimple! (none of these others have been out of the boardso they are as original)
Can anyone tell me the correct way round as I dont wish to change mine and find it was correct to begin with?
regards
John

Ohm Supplies:
John,

INfo. on fitting the opto and checking the transformer is on the backer that comes with the kit, failing that, you can check but fitting the opto. the same way as the other 2. (the nearest being the other side of the stand by transformer or as always with opto's, follow the line that splits 2ndary/primary

regards
Andy

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