LG KG271 - Page 56

4. TROUBLE SHOOTING
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START
Does the SIM cards
supports 3V ?
NO
Change the SIM Card. Our phone
supports only 3V SIM card.
YES
Check J300.PIN1
NG
OK
J300.PIN1 = 2.85V
Change board
Check soldering
status of J300 and
Other component
OK
NG
Resolder J300 or
other component
R302/C310/
C311/C312
OK
Check Operation
Change board
Re-download SW
Checking Flow