LG GW520 - Micro SD Trouble

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Only for training and service purposes
5. Trouble shooting
GW520 service manual
5.9 Micro SD Trouble
Start
END
YES
NO
Change U200
Change Micro SD card
Does Micro SD card
work well?
Check soldering of S200
And relevant component
Check voltage of
2V8_VMME, 2V62_VIO
TP1
Does Micro SD card
work well?
ResolderS200 and
Relevant component
1. Change soket(S200)
2. Change main board
NO
YES
YES
NO
NO
YES
YES
Checking Flow
Start
END
YES
NO
Change U200
Change Micro SD card
Does Micro SD card
work well?
Check soldering of S200
And relevant component
Check voltage of
2V8_VMME, 2V62_VIO
TP1
Does Micro SD card
work well?
ResolderS200 and
Relevant component
1. Change soket(S200)
2. Change main board
NO
YES
YES
NO
NO
YES
YES
Checking Flow
Circuit DiagramCircuit Diagram
S/W (Level)
Close(LOW)OUT
MMC_CARD
IN Open(HIGH)
VA206 EVLC5S0250
EVLC5S0250VA205
0.1u
C233
2V8_VMME
R227 100K
R225 510K
100KR229
10KR231
VA200 EVLC5S0250
EVLC5S0250VA204
VA202 EVLC5S0250
VA201 EVLC5S0250
R226 100K
100KR230
VA203 EVLC5S0250
2V62_VIO
DAT2
DETECT_A
DETECT_B
DUMMY1
DUMMY2
DUMMY3
GND
VDD
VSS
ENSY0023501
104042-001
S200
CD_DAT3
CLK
CMD
DAT0
DAT1_2
R224 100K
100KR228
MMC_D0
MMC_DETECT
MMC_CMD
MMC_CLK
MMC_D2
MMC_D3
MMC_D1
TP1