LG E475F Service Manual page 31

Antenna Switch Module logic(SKY77584)
STAND-BY
GTX_LB
GTX_HB
GRX_LB
GRX_HB
WTRX_HB
WTRX_LB
Checking Switch Block Power Source
LGE Internal Use Only
ANT_SEL 0 ANT_SEL 1
LOW
LOW
LOW
HIGH
HIGH
HIGH
LOW
Check ANT_SEL 0,1,2,3
High Level
1.2V < Voltage < 3V
Yes
Check the Logic
In each mode
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3. TROUBLE SHOOTING
ANT_SEL 2
LOW LOW
LOW HIGH
HIGH HIGH
LOW LOW
HIGH LOW
LOW HIGH
HIGH LOW
No
Check the TP1(VBATT)
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Tx_EN
LOW
HIGH
HIGH
LOW
LOW
LOW
LOW
Only for training and service purposes