LG 410G Service Manual page 41

4. TROUBLE SHOOTING
4.4.2 PAM INPUT Part(Locosto Output)
CHECKING FLOW
Check Control
Signals
Signals are
Normal ?
Yes
PAM Control Signal
is OK.
See next page to
check
ASM & Mobile SW
Circuit.
VBAT
ECCH0003002
C2012JF1A106ZT
C407 C408 C405
C406 C409
0.01u 0.01u
0.01u 39p 10u
L411
15
DCS_PCS_OUT
3.3nH
C415 C417
11
EGSM_OUT
0.5p 1p
SKY77318
19
RSVD_GND
21
P_GND
L410
C419 2.7nH C421
DNI 0.5p
< PAM INPUT Circuit>
LGE Internal Use Only
No
Check
Locosto(U102)
R400
15K
C400
close to DBB
68p
3
DCS_PCS_IN
4
U400
EGSM_IN
18
ENABLE
1
BS
C422 C423
0.5p 27p
-38-
SW400
< PAM INPUT Placement>
②
①
TX_RAMP
L400
TXHB
3.3nH
C402 C403
VDDRF1
L401
1.5p 1.5p
1nH
C410
15p
②
C412
180p
L403
18nH
①
C413
R403
TXLB
10 L404 47p C418
C414 DNI
10nH
1.5p
R404 47
PA_EN
R405 47
PA_BAND
- 42 - Copyright © 2009 LG Electronics. Inc. All right reserved.
U102
X101
FL400 U400
High Band
Type 5dB
(3 ~ 7dB)
Low Band
Type 5dB
(3 ~ 7dB)
Only for training and service purposes
②
①