LG KT520 Service Manual page 89

4. TROUBLE SHOOTING
4.5.2 Optical Joystick key Trouble
START
Reboot the phone
OJ key works well?
No
Board to Board CN reconnect
(Main : CN501, Key : CN100)
OJ key works well?
No
Change Key PCB
OJ key works well?
No
Change OJ key module
LGE Internal Use Only
Yes
Finish
Yes
Finish
Yes
Finish
- 90 -
CN102
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< Key Board ñ BOTTOM side >
< OJ Key module >
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Only for training and service purposes
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