Only For Training And Service Purposes - LG KP105 Service Manual

RX Trouble
TEST POINT
TP1
TP5
Mode
VLOGIC (TP3)
TXON_PA (TP4)
BS(TP5)
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TP2
TXON_PA
SW401
TP4 TP3
FL401
GSM900 RX DCS1800 RX
H(2.7V) H(2.7V)
L L
L H(2.7V)
4. TROUBLE SHOOTING
CHECKING FLOW
Check TP 1, 2 of SW401
with RF Cable
Signal is
OK ?
Yes
Check TP3, 4, 5
Yes
Control
Signal is
OK ?
Yes
Check FL401
Yes
Signal is
OK ?
Yes
Mobile SW & SAW filter is OK.
Check Antenna.
Yes
Signal is
OK ?
Yes
Change the PCB.
- 53 -
No
Replace Mobile
SW (SW401)
No
Check ULC2
(U102)
No
Replace FL401
No
Replace FL401
LGE Internal Use Only