LG GD910 - Page 94

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Only for training and service purposes
LGE Internal Use Only
5. Trouble shooting
GD910 service manual
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Test Point Net name Description
TP4 PA_LEVEL Power Amp Gain Control. Typically, 0.2 ~1.6V
TP5 VBAT PAM Supply Voltage (Vcc > 3V)
Table 1.
GSM PAM Circuit Diagram
C455
0.1u
R408 1.2K
C451
10n
U402
BS
313
BY_CAP1
BY_CAP2
9
1
DCS_PCS_INDCS_PCS_OUT
12
14
GND1
GND2
11
GND3
8
7
GSM850_900_IN
10
GSM850_900_OUT
2
MODE_SELECT
15
PGND
TX_EN
6
4
VBATT
5
VRAMP
TQM7M5005
C449
1.5p
L405
27nH
C453
33p
18p
C454
VBAT
L406
2.7nH
C509
6.8p
39p
C456
10u
C448
10n
C450
2G_BS
PA_LEVEL
PA_MODE
LBAND_IN
TXON_PA
HBAND_IN
SW400
MM8130-2600
G1G2
G3 G4
INOUT
1
C
L426
NA
C517
DNI
TP1
TP3
TP4
TP5
TP2