LG U8120 Service Manual page 173

4. TROUBLE SHOOTING
D. GSM PAM Check
GSM Tx
(C1341)
5
DCS Tx
(C1352)
Check Vapc level.
Check if there is any Major
difference.
Refer to Figure
Check GSM/DCS PAM
output power at ⑤ .
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
Vapc
(C1327)
N o
Y e s
N o
Y e s
- 174 -
TXON
Vapc (DCS)
Resoldering APC block
Chang ing GSM PAM
( N1 3 00 )