LG GD580 Service Manual page 151

4. Trouble Shooting
TP Command
-mode =4
- WTXC=9750, 1,754,643,418,568
Check Duplex output
(C129, L112)
To Check PAM
output
WCDMA PAM is OK
Check C149
To Check PAM Input
level
Check C115, C157
To Check PAM control
signal from AB3000
(Bias_CTRL)
Check C133, C110
To Check PAM VCC
BIAS
from DC/DC converter
(VCC_WPA)
LGE Internal Use Only
No
22dBm ?
Yes
See the Next page
Level
>2dBm
Yes
1.1V at
Po_max
?
Yes
3.4V ?
Yes
Change The PAM
Level
< -
10dBm?
Yes
Check the WCDMA RF Tx Chip (RF3100)
No
Check the RF3100
to WCDMA PAM Signal line
No
Change
the DC/DC
No
- 152 - Copyright © 2009 LG Electronics. Inc. All right reserved.
No
Download the SW
& Calibrate
Only for training and service purposes