Sanyo DP42849 - No Power At All

[tom66]

Re: Sanyo DP42849 - No Power At All

What capacitance and voltage rating is printed on C605?

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

C605? There's nothing there. Did you mean C603?

[tom66]

Re: Sanyo DP42849 - No Power At All

C905, sorry. Reading upside down is hard.

Did you reinstall D902?

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

Ah. C905: Looks like 50v; 1 microfarad.

Yes, I resoldered the leg I pulled up.

[tom66]

Re: Sanyo DP42849 - No Power At All

C905 is only 1uF/50V? That is quite big for that volt/capacitance rating. Is that C902 maybe?

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

Double checking . . .

C902 is 50v 22uf
C905 is 50v 1uf

[tom66]

Re: Sanyo DP42849 - No Power At All

IC601 D/S


Will try to post tomorrow; our timezones are inconvenient! 1am now and I need to be up at 9am.

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

No worries. Thank you for all you've done so far!

[tom66]

Re: Sanyo DP42849 - No Power At All

OK, try checking the voltage across each of those capacitors, as before.

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

C902 & c905?

[tom66]

Re: Sanyo DP42849 - No Power At All

yep.

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

C905: .02 -->.06
c902: 16.60 --> 19.90
c603: ~.01 --> ~.01

[tom66]

Re: Sanyo DP42849 - No Power At All

So, it looks like D903, a little SMD diode on the bottom of the board, is a potential candidate. It's near C905. This develops the supply voltage for the main switcher IC. It is possibly open circuit, which could be caused by a short, or the initial failure.

Can you get a picture of the area around this diode - I need to be able to see where all the traces go into this device.

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

I'm on it.

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

Here you are:

[tom66]

Re: Sanyo DP42849 - No Power At All

That confirms my hunch; check D903 is not open circuit. Also, check on 2000 ohms across that capacitor C905 right next to it (allow reading to settle for 5 seconds first.)

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

D903: 626
c905: "1"

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

Bump. Sorry I havent gotten back, my internet been down since thursday.

[tom66]

Re: Sanyo DP42849 - No Power At All

My fault for not checking. Can you see any part # on D903? Could just be a few letters.

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

There wasn't much I could do without internet anyway, so I didn't mess with it.

Looks like 5p. Might also be 5D. It really looks like a 'p', tho.