Ear-Mic Jack Detection Trouble Shooting - LG KE520 Service Manual

4.13 Ear-Mic Jack Detection Trouble Shooting

START
Disassemble the rear case of
phone.
Connect the Ear-Mic Headset to
the Ear-Mic Socket of phone.
Check the Ear-Jack Detection.
Is the status of VA301, R305 low?
YES
Check the soldering status
Of CN300. Is it O.K?
YES
The main_PCB has a
Problem,
Change the main_PCB.
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Only for training and service purposes
4. TROUBLE SHOOTING
NO
Re-solder
R305, VA301
NO
Re-solder Pin #8 of CN300
- 99 -
VA301
R305
LGE Internal Use Only