LG -P715 Service Manual page 56

ANTENNA SWITCH MODULE LOGIC (SKY77544)
GSM850/GSM900 TX
DCS1800/PCS1900 TX
PCS1900 RX
DCS1800 RX
GSM 900 RX
GSM 850 RX
W1700
W900(W850)
W2100
Checking Switch Block Power Source
Check ANT_SEL 0, 1, 2, 3High Level
Check the Logic each mode1.2V
LGE Internal Use Only
ANT_SEL0
LOW
HIGH
LOW
LOW
HIGH
HIGH
HIGH
LOW
HIGH
1.2V < Voltage < 3V
Yes
ANT_SEL1
HIGH
HIGH
LOW
HIGH
HIGH
LOW
LOW
LOW
LOW
No
Check the TP1(VBATT)
- 56 - Copyright © 2013 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
ANT_SEL2 ANT_SEL3
LOW
LOW
LOW LOW
LOW (X) HIGH
LOW (X) HIGH
LOW (X) HIGH
LOW (X) HIGH
LOW LOW
HIGH LOW
HIGH LOW
Only for training and service purposes