5-3 Trouble shooting Chart
BT has no sound
Go
Check whether there is audio signals No
of the 4 and 8 pin of XP11
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
\
BT board has problem
and change it
Confirm whether there is audio signals of
the 5 and 14 pin of U17
Check the connection of R162 and
R169 to U17
Confirm whether there is audio signals of
the 3 and 13 pin of U17
U17 has problem
Check whether it is right of the
IIS signal between U16 and MPEG
Check whether there is audio signals of
the 22 and 24 pin of XP82
Check the connection of VFD board
and main board
If MCLK, BLCK and LRCLK of IIS signal
isn’t normal ,MPEG has problem .
If data line has no output,U16 has
problem.
Check the signal output from U485
U485 has problem
Confirm whether there is PWM wave of
the 2 pin of U481
U481 has problem
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