LG GT500 Service Manual page 153

4. TROUBLE SHOOTING
TP Command
-mode =5
- WTXC=9750, 1,754,643,418,568
Check Duplex output
(L601, C152)
To Check PAM
output
Check R162, R152
To Check PAM Input level
Check C115, C157
To Check PAM control signal
from AB3100
(Bias_CTRL)
Check C103, C155
To Check PAM VCC BIAS
from DC/DC converter
(VCC_WPA)
LGE Internal Use Only
No
22dBm ?
Yes
WCDMA PAM is OK
See the Next page
Level
>2dBm
No
Yes
1.1V at
Po_max?
No
Yes
3.4V ?
No
Yes
Change The PAM
- 154 -
No
Level
< -10dBm?
Yes
Check the WCDMA RF Tx Chip (RF3300)
Check the RF3300
to WCDMA PAM Signal line
Change
the DC/DC
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Only for training and service purposes
Download the SW
& Calibrate