LG MG370 Service Manual page 69

4. TROUBLE SHOOTING
ULC2 RF Output Signals
C400 C401 C402 C403 C404
10u 12p 0.01u 33p 18p
(2012 size)
R403
1K
C408
39p
L401
15
DCS_PCS_OUT DCS_PCS_IN
1.5nH
11
U400
C412
EGSM_OUT
SKY77318
1.8p
19
RSVD_GND
21
P_GND
L402
2.7nH
C418
2.2p
Paon & BS
LGE Internal Use Only
SC400
1
2
3
4
5
6
7
C405 C406 8
27p 0.01u 9
3
4
R404
EGSM_IN
NA
18
TXON_PA
ENABLE
1
BS BAND_SEL
C414 C415
27p 27p
R406
NA
Vapc
ASM
10
11
12
13
14
15
16
17
18
19
Shield CAN
C409
DCS_PCS_OUT
100p
R405
NA
C416
GSM_OUT
100p
R407
HB RF Input
NA
CHECKING FLOW
Check Control
Signals
Signals are
Normal ?
Yes
PAM Control
Signal is OK.
See next page to
check
ASM & Mobile SW
Circuit.
Copyright © 2007 LG Electronics. Inc. All right reserved.
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U400
LB RF Input
No
Check
ULC2(U102)
Only for training and service purposes