Folder On/Off Troubleshooting - LG TU550 Service Manual

4.13 Folder ON/OFF Troubleshooting

Folder On/Off is worked as below :
Folder On/Off Event -> Flip(U500 pin 1) is triggered(On : about 2.1V, Off : 0V) ->
MSM6275 Sense the Folder Event
magnet
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Only for training and service purposes
Start
NO
Check the magnet in
Folder Assy
Yes
Approach the magnet to
U504
NO
FLIP(U504 pin 1) is 0V?
Yes
Change the Main board
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4. TROUBLE SHOOTING
Insert the magnet
Change the U504
U504 pin 1
LGE Internal Use Only