LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.12 Folder on/off trouble
Folder On/Off(Close/Open) is worked as below :
Folder On/Off Event
→
Flip(U402 pin 1,key board) is triggered(Open : about 2.7V, Close : 0V)
→
Key coder IC(U404) sense the Folder Flip Event
→
Key coder IC send the key
information to CPU by I2C interface
Insert the magnet
Check the magnet in
folder Assy
Approach the magnet to U402
FLIP(U402p in 1) is 0V?
Yes
NO
Yes
Check the U402
And check the R413
for AP_VDD_IO_2.7V
Start
End
Yes
NO
Change the Main Board
Check R414, 415, C418,TP407,TP406
Work well?
NO
YES
NO
Work well?
RA400
U404
R415
R414
C418
TP406
TP407
magnet
U402
R413
Содержание KS10
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