LG GS290 Service Manual page 83

4. TROUBLE SHOOTING
GS290 Operational Description Revision B
START
Check Micro SD card voltage
(2V8_VMME)
Resolder it
No
(check data line
TF socket pins
TP 1~4 is 2.9V
are well soldered
Signal)
Yes
Yes
Replace Main Board
Check proper
uSD?
Assemble
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