LG KG110 - SIM Trouble

4. TROUBLE SHOOTING
69
LD206
LEBB-S14H
R226
220
C226 1u
KEY BACKLIGHT
(6 LIGHT)
KEY BOARD_BACKLIGHT
VBAT
LD201
LEBB-S14H
R221
220
LD202
LEBB-S14H
R222
220
C222 1u
LD203
LEBB-S14H
R223
220
C223 1u C221 1u
LD204
LEBB-S14H
R224
220
C224 1u
LD205
LEBB-S14H
R225
220
C225 1u
4.14 SIM Trouble
Figure 4-20
Checking Flow
J300
Pin 1
START
Does the SIM
supports 3V?
Voltage at pin1 of
J300 equal to
2.85V?
Check the
soldering condition
of J300
Check the contact
between J300 and
SIM card
Change the SIM and
try again. Does it
work properly?
Does it work
properly after re-
downloading
Software?
SIM will be detected
Change the
PCB board
Replace J300
Replace J300
Voltage at one
point of C117
equal to 2.85V?
Change the SIM. This phone
supports 3V SIM only.
Change the
PCB board
No
Yes Yes Yes Yes
No
Yes
No
No
No
Yes
No
The SIM is malfunctioned,
Change the SIM card.
Yes
No
4.14 SIM Trouble
Checking Flow