Lien Chang LCAP07F 12V brick, no voltage

[Behemot]

Output caps were bloated, small cap toasted. Fuse between secondary ground and wall ground was partialy blown. Replaced all, still nor working.

All silicon is good but probably driving curcuit, tiny 6pin device. Only 2,7 V is coming through high-resistance resistor array to it, that is most likely too low for it to operate. It is labeled .63601, have not foudn anything like that.

[budm]

Re: Lien Chang LCAP07F 12V brick, no voltage

Any pictures? Fuse between secondary ground and wall ground was partialy blown: Secondary cold side ground and the primary side safety ground?

[Behemot]

Re: Lien Chang LCAP07F 12V brick, no voltage

Yep. It was somewhat toasted, measured 5 units voltage drop (diode tester).

That voltage is preset on C106, C105 is 0. Seems like it's just dropping voltage from input, than it's rectified and smoothed and fed into the driving IC.

[ben7]

Re: Lien Chang LCAP07F 12V brick, no voltage

Yep. It was somewhat toasted, measured 5 units voltage drop (diode tester).

That voltage is preset on C106, C105 is 0. Seems like it's just dropping voltage from input, than it's rectified and smoothed and fed into the driving IC.

Yes that is usually how they work.

Could you get a better picture of the bottom of the board? It is hard to see the traces around C106 and C105 because of the angle and the lighting.

BTW, I always have to ask, what brand caps were in this sucker? :P

[Behemot]

Re: Lien Chang LCAP07F 12V brick, no voltage

It is quite overburned but traces are somewhat more visible. Can't give ya more than this, the old Lumix FZ4 just does not do any more.

Samxon GK, better than no-name craps but if they'd have chosen GT…