Actually this was a Quadra 605, but mainboards are the same.
On this board 4 of the VIA's around C137 were toast:
The 12V supply can be picked up as shown in the picture on R85.
U30-24 was bodged to U19 as shown in the picture (this is where the broken VIA's were going.)
There was also some repair and replacement of the TDA7052AT Amp.
SPKR- Bodge underneath the board which goes to the speaker jack J17-2
Now the speaker was working, but just giving static.
After slaving over U30 / DFAC-II for a while hahah, I found out that something ugly must have happened under the chip, because U30-12 & U30-21 were not connected to QVCC!
So a couple bodges later...
Bodge U30-12 and U30-21 to U30-1. And now it's working.
DFAC-II Pin Reference
Schematics (page 13)
On this board 4 of the VIA's around C137 were toast:
- SPKR- feed to the TDA7052AT Amp
- 12V supply to the TDA7052AT Amp
- VIA's that connect U30-24 to Sys_Reset
The 12V supply can be picked up as shown in the picture on R85.
U30-24 was bodged to U19 as shown in the picture (this is where the broken VIA's were going.)
There was also some repair and replacement of the TDA7052AT Amp.
SPKR- Bodge underneath the board which goes to the speaker jack J17-2
Now the speaker was working, but just giving static.
After slaving over U30 / DFAC-II for a while hahah, I found out that something ugly must have happened under the chip, because U30-12 & U30-21 were not connected to QVCC!
So a couple bodges later...
Bodge U30-12 and U30-21 to U30-1. And now it's working.
DFAC-II Pin Reference
Schematics (page 13)