LG C1100 Service Manual page 76

Checking Flow
START
Check the magnet
in the folder side.
Yes
Voltage at Pin 6
of U103 = 2.8V ?
Yes
Open Folder.
Voltage at Pin 1 of U103
= 2.8V ?
Yes
Close Folder or
get close any magnet to U103.
Voltage at Pin 1 of U103
= 0V ?
Yes
Does it work properly?
Yes
FOLDER WILL WORK
PROPERLY.
No
Place the magnet properly.
No
Voltage VEXT1 of U102
= 2.8V?
Resolder U103.
No
Resolder R142 & U103.
No
Replace U103.
Redownload software
No
or change the main board.
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4. Trouble Shooting
No
Replace U102.