LG KF690 Service Manual page 141

9. PCB LAYOUT
CN301
<Main PCB to sub FPCB
connector>
- Can`t take a picture
- No SIM
- No micro SD detection
- Can`t take a picture
U507
<ISP IC>
- Camera operation
- Can`t take a picture
CN500
<Mega camera connector>
- Can`t take a picture
X00
VCTCXO
-check the frequency (19.2MHz)
U100
RF IC
-GSM RX/TX operation
X400
X-tal
-check the frequency (32.768MHz)
U402
PMIC
- Power management
U403
Charging IC
- check the TA and battery
- No power on
U401
OVP IC
- over voltage protection
LGE Internal Use Only
- 142 -
U101
<GSM PAM>
- GSM TX AMP. operation
- No call
- Low Tx power
FL100
<FEM>
- No call
- No service
SW 101
RF SW
SW100
Antenna SW
CN302
Main PCB to Key FPCB
connector
- No booting when users push the
power on button
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Only for training and service purposes