LG KM710 Service Manual - Page 51
Mobile Switch & PAM & FEM Circuit
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4. Trouble Shooting 4.2.2.1 Mobile Switch & PAM & FEM Circuit Mobile Switch X400 U401 U403 U400 U402 FL400 SW400 SW401 between C413 and C421 Is short? YES FEM NO Replace SW400 Check Control Signal NO C422, C424 YES NO Check R403, R404 RF LEVEL ≥ 0dBm YES Re-download SW & CAL Check U401 Check U402 TX LB_HB TX_ANT_SW_EN TX LGE Internal Use Only - 52 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes
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4.2.2.1 Mobile Switch & PAM & FEM Circuit
- 52 -
4. Trouble Shooting
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
Re-downloa
d SW & CAL
FEM
Check Control Signal
C422, C4
24
Mobile Switc
h
SW401 between C413
and C421 Is shor
t?
Re
place SW400
Ch
eck U401
YES
YES
NO
NO
Check R403, R404 RF LEVEL
≥
0d
Bm
Check U402
YES
NO
TX
TX
LB_HB
TX_ANT_SW_EN
U402
SW400
U400
U401
FL400
U403
X400
<GSM850>
<PCS1900>