Classic II no sound….solved

[bibilit]

I had a spare Classic II, new caps around, worked but had no sound.
At some point, removed the DFAC for a test, but was not able to found the issue.
I was trying to troubleshoot an Analog Board, using this unit.
When the logic board was upside down, noticed a dark area in one trace…which was broken.
Trace was going from the DFAC to a capacitor !!
A small wire… and sound is back.

 

[chiptripper]

I had the same issue (no sound on a recapped board) and turned out to be the exact same issue. This trace was broken on the underside, disconnecting the DFAC from C9.

Nice, thanks for saving me some time!

 

[cgp]

That C4/5/8/9 combo reeks all sorts of havoc. I’ve recently restored a Classic II and both serial ports didn’t work due to broken traces and blown vias in this area.

 

[smrieck511]

Anyone know the specifics of C4? I managed to lift one pad (C4 +). There's a trace going from (what was) that pad to a chip labeled 34119 025 (which I bodged)...But there's also a trace on the opposite side of that pad leading to two vias....No clue how to bodge that as I don't know where the vias are going. Thanks for any help.

 

[smrieck511]

Disregard. I repaired both traces.