LG KP105 - Page 52

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4. TROUBLE SHOOTING
RX Trouble
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Only for training and service purposes
Check TP 1, 2 of SW401
with RF Cable
Signal is
OK ?
Replace Mobile
SW (SW401)
Yes
No
Yes
Mobile SW & SAW filter is OK.
Check Antenna.
Check ULC2
(U102)
Control
Signal is
OK ?
No
Yes
Check TP3, 4, 5
Yes
SW401
TXON_PA
Check FL401
FL401
Signal is
OK ?
Replace FL401
Yes
No
H(2.7V)LBS(TP5)
LLTXON_PA (TP4)
H(2.7V)H(2.7V)VLOGIC (TP3)
DCS1800 RXGSM900 RXMode
Change the PCB.
Signal is
OK ?
Replace FL401
Yes
No
Yes
TP5
TP3TP4
TP1
TP2
TEST POINT CHECKING FLOW