LG VX8500 Service Manual page 81
Dual band cdma pcs/cellular/w/gps cdma mobile phone
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Also See for VX8500:
- Quick start manual (13 pages) ,
- Datasheet (2 pages) ,
- Guía de inicio rápido (12 pages)
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VX8500
4.2.2.6. Check PCS PAM Circuit
Test Point
VCC2A
U106
PA_R1
VCC1
RFIN_PCS
LG Electronics Inc.
Checking Flow
RFOUT_PCS
Start
Check U106 Pin5, 7
RFIN_PCS / RFOUT_PCS
Refer to Graph4.2.2.6
Similar?
Check U106 Pin4 or 10
≥3.4V
VREF_PCS
Check U106 Pin6
≥2.75V
Check U106 Pin3
≤1.8V
Replace U106
89
YES
PAM Circuit is OK
NO
NO
Check VCC Line
YES
NO
Check +3.0V_TX Line
And PA_ON
YES
NO
Check PA_R1 Signal Line
YES
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