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Nearly dead sound on my Performa 550
Posted by: ReGZ0089 on 2020-10-20 10:39:33
Hey folks,

Got an interesting issue and I wanted to ask the community here about it.

Back during the summer, I picked up a Performa 550 with some sound issues that I picked up from the original owner for 50 bucks.

It came with everything and worked fine outside the sound issue. 

Sound comes out extremely quiet, even with the volume cranked thru head phones. I knew the board had some capacitor issues, etc. so I had it sent out to clean the board, and replace the caps. It came back with the issue still not resolved. 

Is there anything else that can be done for this board?

I swapped it into a color classic I have and the issue still stands, so it is a logic board issue.

(Board before it was cleaned)

116764238_10160099955853989_2473575737114004687_n.jpg
Posted by: bibilit on 2020-10-20 12:10:58
Probably an issue with the Digital Audio  chip, the one surrounded by caps in your picture. 

Probably still contaminated by goo. 
Posted by: ReGZ0089 on 2020-10-20 12:15:54
That.. was not something I considered, would it be best to desolder the chip off the board and resolder it after cleaning under it?
Posted by: bibilit on 2020-10-20 13:14:58
It’s usually the way to go, doesn’t works every time though
Posted by: Scott Baret on 2020-10-20 23:21:46
Following. I have a 550 with no sound. It hasn't been re-capped though, as I just got it on Saturday.
Posted by: MrFahrenheit on 2020-10-22 07:05:54
I bought a 550 board in a huge lot of items. I recapped it and when I tried it I had no sound as well. The board was clean before recapping. 
 

From what I’ve found, sound chips in the color Classic/color Classic II, LC520/550 boards are notorious for dying. Bruce from recap a Mac in Australia has mentioned in his videos he has a drawer full of brand new stock sound chips for these machines, because it’s such a pandemic of failure. 
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