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4. TROUBLE SHOOTING
①
Check voltage
at pin 1 at U403 2.8V?
Yes
④
Check the voltage
of pin 5 of U400.
is almost 1.2V?
Check the soldering
J400
Resoldering J400
Earphone detect problem
No
Check the
soldering U403
Resoldering U403
Earphone receiving path problem
②
No
Yes
No
Yes
No
Check the
soldering J400
Yes
Resoldering J400
Check the voltage
of pin 3 of U400.
is almost
1.2V?
Yes
Resolder or
replace U400
④
- 96 -
No
Replace U403
Yes
No
Replace the Main
board
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