LG -T370 Service Manual page 91

4. TROUBLE SHOOTING
START
No
Does the SIM card Change the SIM Card.
support 3V or 1.8V ? This phone supports 3V or 1.8V SIM card.
Yes
Voltage output No
No
Is Voltage at the pin#1
of VSIM LDO (TP01)
Change the U10
of S301 .85V or 1.8V?
Is .85V?
Yes
Resolder S301
No
No redownload SW.
Change the SIM Card
Does it work
And try again.
Change the main board
Properly?
Does it work
Properly?
Yes Yes
SIM card is properly working SIM card is properly working.
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