LG GS205 Service Manual page 91

RF Transceiver (MT6139)
Check Antenna
YES
Check J104 output by
spectrum :
BAND:900 ARFCN:40
BAND:1800 ARFCN:700
YES
Check C112 output ?
Check BAND:900 L110
BAND:1800 L109
utput ?
Check BAND:900 L201
BAND:1800 L203
output ?
YES
Check X201 output?
YES
Download S/W or
Re-calibration
NO
NO
NO
YES
NO
YES
NO
NO
Change Antenna
Replace J104
Replace U107
Check R101
signal is ok?
YES
Replace U101
Check B201
B202 B205(2.8±
0.2V)of voltage
is ok?
Check R201
signal is ok?
YES
Replace U201
Replace X201
91
NO
Replace U401
NO
Replace U202
NO
Replace U401