LG VX8500 Service Manual page 68

VX8500
4.2.1.6. Check DCN PAM Circuit
Test Point
RFOUT_CELL VCC2
U106
VREF_CELL PA_R1
RFIN_CEL
LG Electronics Inc.
Checking Flow
Check U106 Pin2, 11
RFIN_CELL / RFOUT_CELL
Refer to Graph4.2.1.6
Check U106 Pin4 or 9
VCC1
Check U106 Pin1
Check U106 Pin3
76
Start
YES
Similar?
NO
NO
≥3.4V
YES
NO
Check +3.0V_TX Line
≥2.75V
YES
NO
≤1.8V Check PA_R1 Signal Line
YES
Replace U106
PAM Circuit is OK
Check VCC Line
And PA_ON