Micro Sd Trouble - LG U990 Service Manual

4. TROUBLE SHOOTING

4.11 Micro SD trouble

Micro SD is worked as below :
Micro SD insertion → MICROSD_DETECT(R804) goes to low → go working
Start
Insert the Micro SD Card
MICROSD_DETECT(R804))
Check VREG_MMC_3.0V
is over 2.85V?
Work well?
SOCKET
LGE Internal Use Only
NO
is low ?
YES
NO
YES
NO
YES
End
R804(DETECT)
Change the SUB board
Work well?
NO
Change the MAIN board
C807(VREG_MMC_3.0V)
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YES
Only for training and service purposes