Sim Trouble - LG KG110 Service Manual

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4.14 SIM Trouble

4.14 SIM Trouble
J300
Checking Flow
Checking Flow
START
Does the SIM
Yes
supports 3V?
No
Change the SIM. This phone
supports 3V SIM only.
No
Change the
PCB board
KEY BACKLIGHT
(6 LIGHT)
Figure 4-20
Voltage at pin1 of Check the
J300 equal to Yes soldering condition
2.85V? of J300
No
No
Voltage at one
point of C117 Yes Replace J300
equal to 2.85V?
4. TROUBLE SHOOTING
Check the contact
Yes between J300 and
SIM card
No
Replace J300
69
KEY BOARD_BACKLIGHT
Pin 1
The SIM is malfunctioned,
Change the SIM card.
Yes
Change the SIM and
Yes try again. Does it
work properly?
No
Does it work
properly after re-
No
downloading
Software?
Change the
PCB board
Yes
SIM will be detected