LG GD910 Service Manual page 51
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- User manual (229 pages)
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4. RF Circuit Technical Brief
[Figure 4.2.5-2] GD910 Front End Control (Control signal from Baseband IC)
LGE Internal Use Only
MAIN ANT
C400
6.8p
C401
2.2nH
SW400
MM8130-2600
G3 G4
OUT
IN
G2
G1
L426
NA
2V85_VRF
C439
1000 pF
ANT_SEL2
ANT_SEL6
U403
1
8
ANT_SEL1
A1
VCC
2
7
ANT_SEL4
B1
Y1
3
6
Y2
B2
4
5
GND
A2
NL27WZ32USG
[Figure 4.2.5-1] GD910 Front End Control (FEM input)
ANT_SEL1
_CHG_EOC
SPK_AMP_EN
PA_MODE
ANT_SEL2
ANT_SEL3
B18
GPIO14
A15
GPIO15
B13
GPIO16
C13
GPIO17
A12
GPIO18
B12
GPIO19
GD910 service manual
ANT401
1
2
FL400
LMSP43QL-771
GSM850_900TX
C405
GSM1800_1900TX
100p
2
ANT
GSM850_RX1
GSM850_RX2
C517
GSM900_RX1
DNI
GSM900_RX2
GSM1800_RX1
GSM1800_RX2
GSM1900_RX1
1
GND1
GSM1900_RX2
8
GND3
10
GND2
23
GND4
24
GND5
C440
0.1u
FB401
1800
FB402
1800
FB403
1800
FB404
1800
2V85_VRF
C444
1u
ANT_SEL3
ANT_SEL5
T_OUT1
P7
T_OUT2
W11
T_OUT3
U10
T_OUT4
U9
T_OUT5
AA10
T_OUT6
W10
T_OUT7
N7
T_OUT8
3G_PA_MODE1
ANT_SEL4
ANT_SEL5
ANT_SEL6
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Copyright © 2009 LG Electronics. Inc. All right reserved.
11
9
12
13
14
15
16
17
18
19
20
UMTS1
21
UMTS2
22
UMTS3
Only for training and service purposes
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Troubleshooting
