LG U890 Service Manual page 53

3. TECHNICAL BRIEF
3.10.6 Folder ON/OFF Operation
There is a magnet to detect the folder status, opened or closed.
If a magnet is close to the hall-effect switch, the voltage at pin1 of U600 goes to 0V. Otherwise, 2.7V.
This folder signal is delivered to MSM6250A GPIO80.
VREG_MSMP_2.7V
FOLDER_DETECT
FOLDER_SENSE
R600
62
Figure. Schematic of Folder ON/OFF detection circuit
U600
A3212EELLT-T
VDD
OUT
C603
0.1u
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G1
G2