Table of Contents
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Speaker does not work
Yes
PAM400 pin 3,16(VDD)
= 3.7V?
Yes
U303 and U304
(analog Switch) pin 5
≒ 3.7V?
Yes
Does Speaker Receive
The Signal from PAM400
(Audio AMP) ?
Yes
Is Speaker working?
Yes
END
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No
Resolder or replace PAM400 and
No
Resolder U303, U304 and U402
No
Resolder R307, R308, C312, C313,
No
Change the Speaker
9-11
Flow Chart of Troubleshooting
U402
C314, and C315
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