LG VX9100 Service Manual page 71

VX9100
Check if there is any major difference referring
Check pin 4 , 11 (TP3) at U105 ( Vcc)
Check pin3(TP4) at U105(PA_R1 signal)
RFIN_CELL fed up with CW signal
in low gain mode of PAM
Copyright © 2007 LG Electronics. Inc. All right reserved
Only for training and service purposes
Start
Check pin 2 ,13 (TP1,2) at U105
To Figure 4.2.1(i) Is it similar?
YES
whether it is higher than 3.4V.
YES
whether it is lower than 2.2V.
YES
Replace U105
Checking Flow
Checking Flow
YES
NO
NO
Waveform
Waveform
RF_IN
Figure 4.2.1(i)
- 70 -
PAM circuit is OK. See next page
Check Vcc line
Check PA_R1 line
RFOUT_CELL
LGE Internal Use Only