Folder On/Off Trouble - LG KS10 Service Manual

4. TROUBLE SHOOTING

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
C418
TP407
TP406
R414
RA400
R415
R413
LGE Internal Use Only
Start
Check the magnet in
folder Assy
Approach the magnet to U402
FLIP(U402p in 1) is 0V?
YES
Work well?
Check R414, 415, C418,TP407,TP406
Work well?
End
U404
U402
NO
Insert the magnet
Yes
NO
Check the U402
And check the R413
for AP_VDD_IO_2.7V
Yes
NO
NO
Change the Main Board
Yes
magnet
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