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