Re: LiteOn PA-6601-1A (600w) blows its TOP

Thanks for the replies! and Happy New Year

Attaching pictures of the board to show you what I mean. I believe the SOP8 mosfets marked A2700 are not on the mains side - I meant they are on the primary side of the step-down transformer for the output voltages (which is all on the secondary side of the PSU).

The A2700 mosfets are components Q306A-Q309B (8 in total), but it's only Q307A & Q307B that were overheating (Q307A is removed in the pic, Q307B is seen there hand-soldered). The heatsinks above Q306A-Q309B...

Re: LiteOn PA-6601-1A (600w) blows its TOP

Greetings! and sorry for the necromancy but I read somewhere back in this thread something to the effect that threads never die they're just sleeping...

I've been struggling with a broken LiteOn PA-6601-1A for a long time now, enjoying this thread repeatedly, as each time I order parts it's usually months before my next repair attempt.

When I received the unit C301, C302, R302, Q301 were all damaged so have now been replaced.

However now when I start the PSU by shorting pins 14 & 23 with...