LG KP105 - Installing the SIM Card and Charging the Battery; Installing the SIM Card; Important!

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4. TROUBLE SHOOTING
RX Trouble
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Only for training and service purposes
U401
SW401
U103
FL401
TP1
TP2
TP3
TP4 TP5
TP6
Check TP1, TP2 of
SW401
with RF Cable
Signal is
OK ?
Replace
Mobile SW
(SW40)
Yes
No
Mobile SW & ASM is OK.
See next page
Yes
Replace SAW
Filter (FL401)
No
Check TP3,4 and 5,6 of
FL401 ?
TEST POINT CHECKING FLOW
X101
* TP 3, 4 and 5, 6 outputs of
FL401 are balanced