Macbook A1989 Stuck at 5V

Instafixx

Member
Disconnecting J6400 the machine works fine. No Speaker Sound.

Even if I replace this small microphone. Its the same.

Checked J6400. No Shorts.

What is the issue?

Bare Board on bench.
Only J6400 Connected. Stuck at 5v.
Flex disconnected at J6400. Machine is 20V

U6400 is bad. I do not have a donor board of this model. What other model chip will match?
 
Last edited:

2informaticos

Administrator
Staff member
What microphone?
J6400 is just speaker connector.

Search for TAS5770 on the schematics of your scrap boards.
 
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