LG KF700Q Service Manual page 169

9. PCB LAYOUT
CN301
<LCD F-PCB connector>
-No LCD display
-No sound
-No vibration
-No screen touch operation
-Can`t take a picture
U404
<FM Radio IC>
- FM radio operation
U505
<Speaker Amp IC>
- speaker operation
-No speak sound
U201
<Baseband and RF IC>
- Check the battery voltage and
Outputs of LDOs-Rx operation
U401
OVP IC
- over voltage protection
X401
X-tal
-check the frequency (32.768MHz)
U402
PMIC
- Power management
U104
<WCDMA PAM>
-WCDMA TX AMP. operation
-No call
- Low Tx power
U405
<DC-DC>
-WCDMA PAM Voltage supply
MIC501
<MIC>
- NO MIC Signal
SW 101
RF SW
LGE Internal Use Only
- 170 -
U301
<Memory IC>
- Check s/w download
CN303
<Main PCB to sub PCB connector>
- Can`t take a picture
- No SIM
- No micro SD detection
- Can`t take a picture
U507
<LCD backlight driver + LDO IC>
- No LCD backlight
- Can`t take a picture
M101
<Blue tooth Module>
BT101
<Blue tooth ANT>
X101
VCTCXO
-check the frequency (19.2MHz)
U101
RF IC
-GSM/WCDMA RX/TX operation
FL104
<Duplexer>
-No W850 call
-No W850 service
U102
<GSM PAM>
-GSM TX AMP. operation
-No call
- Low Tx power
FL101
<FEM>
-No call
- No service
FL106
<Duplexer>
-No W2100 call
-No W2100 service
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes