LG GB175 Service Manual page 46

4.2.3 Checking Flow
Does the SIM Card
supports 1.8V or 3V
Check soldering status
Check VSIM =1.8V or 3V
Re-download the SW &
Start
YES
of J500
YES
YES
Check operation
NO
Change Board
NO
Change the SIM Card . Our
phone supports only 1.8V or 3V
SIM Card
NG
Re-solder J500
NG
Change U502
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