LG U8110 Service Manual page 173

4. TROUBLE SHOOTING
D. GSM PAM Check
GSM Tx
(C1341)
DCS Tx
(C1352)
Vapc
(C1327)
Check Vapc level.
Check if there is any Major
difference.
Refer to Figure
Check GSM/DCS PAM
output power at
TXON
Vapc (GS M)
Figure 4-44. GSM/DCS Tx control signal
V apc > 1 .5 V ?
4-44.
G SM: > 23dBm
D C S: > 20dBm
.
GSM Tx Pat h OK. See Next p age t o check
APC
block
N o
Y e s
N o
Y e s
- 174 -
TXON
Vapc (DCS)
Resoldering APC block
Chang ing GSM PAM
( N1 3 00 )