LG L602i Service Manual page 77

4. TROUBLE SHOOTING
MODE
GSM900 TX
GSM1800/1900 TX
GSM900 RX
GSM1800 RX
GSM1900 RX
UMTS 800
UMTS 2100
Checking Switch Block power source
ANT_SEL0, 1, 2 High Level
ANT _SEL0
HIGH
HIGH
LOW
LOW
LOW
HIGH
HIGH
Logic Table of the Antenna Switch
Check Soldering of
2.5V < Voltgae < 3.0V
YES
Check the Logic
in each mode
- 78 -
ANT_SEL1 ANT_SEL2
HIGH
LOW
LOW
HIGH
HIGH
LOW
HIGH
Check VCC
NO
TP1 VREG_RFRX_0_2.85V
LOW
LOW
HIGH
HIGH
LOW
HIGH
HIGH