LG HB620 Service Manual

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4. TROUBLE SHOOTING
4.16.3 Checking PAM Block
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2.2K
R107
68
R108
C141
NA
C137
NA
R114
120
56p
C136
15p
C140
C132
68p
G1
2
G2
3
G3
5
IN
1
O1
4
FL102
EFCH897MTDB1
R112
120
51
R115
33u
C127
C126
1u
+VPWR
C139
15p
56p
C138
22
PGND7
23 24
PGND8
25
PGND9
4
RSVD1
8
RSVD2
12
RSVD3
TX_EN
1
6
VAPC
VBATT
5
PGND1 PGND10
26
PGND11
27
PGND12
28 29
PGND13
30
PGND14 PGND15
31 32
PGND16
33
PGND17 PGND18
34
PGND19
35 18
PGND2
36
PGND20 PGND3
19
PGND4
20 21
PGND5 PGND6
SKY77329
U102
BS
3
DCS_PCS_IN
2
16
DCS_PCS_OUT
GND1
10
GND2
11 13
GND3 GND4
14 15
GND5
7
GSM_IN
9
GSM_OUT
17
R110
91
R109
91
GSM_TX
GSM_PA_EN
GSM_PA_BAND
GSM_PA_RAMP
DCS_PCS_TX
[Fig. 4.18] Schematic of PAM Block
[Fig. 4.19] Test Point of PAM Block
Test Point Net name Description
TP1 GSM_PA_RAMP Power Amp Gain Control. Typically, 0.2 ~1.6V
TP2 GSM_PA_EN Power Amp Enable (ON : >2.5V, OFF : <0.7V)
TP3 +VPWR PAM Supply Voltage (Vcc > 3V)
TP3
TP1TP1
TP2
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LG HB620 Specifications

General

Brand	LG
Model	HB620
Category	Cell Phone
Language	English