LG GS290 Service Manual page 116

7. CIRCUIT DIAGRAM
12 11
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Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
10 9 8
RF
CI:$0.05(CMOS->PIN)
ANT502 ANT501
ANT_STUB
ANT500
TP501
C538
C540
DNI DNI SW500
KMS-518_P
G1
R501 R510 C524 FL500
A
C ANT LMSP43NA-782
17
22p 0 22p
G2
L501
C539
C519 C510
100n DNI
DNI 0.5p
R509
RF_TEMP
22K
PT500
C515 C514 C527 C526
VRF_1V5 VRF_2V85 VRF_2V85 C525 C534
NCP15XH103J03RC
10K 4.7p 4.7p 4.7p 4.7p 2.2p 2.2p
L505 L502 L503
C520 C521
15n 18n
0.1u 4.7n 5.1n
GSM850 GSM900 DCS1800
C506
VC1
0.1u
VC2 FE2
33
VBIAS
34
VDDTX1V5 VDDRX2V8
35 20
LBAND_PAM_IN TX1 VDDRX1V5
36 19
HBAND_PAM_IN TX2 U500 VCO_RC
37 18
VDDTX2V8 VDDVCO2V8
R507
38 PMB6272 17
VDDMIX2V8 EN
C522 10 39 16
GND3 VDDXO2V8
220n 40 15
FSYS1
14
GND4 GND1
41 13
VRF_1V5
VRF_2V85
X500 TSX-3225
4 3
GND2 HOT2
1 HOT1 GND1 2
26MHz
C511 C518
220n 0.1u
CLK26M
RF_CLK
RF_DA
QX
Q
IX
I
10 9 8
7 6 5
VC1 (FE1) VC2 (FE2)
GSM850 / 900_TX H L
GSM 1800 / 1900_ TX L H
(FROM DBB)
(FROM DBB)
R502 100 GSM850 / 900_RX L L
VC1 (FROM Transceiver)
R504 100
VC2 (FROM Transceiver)
GSM 1800 / 1900_ RX L L
C503 C508
47p 47p
SKY77344
VBAT
C501
GND6 GND5
100p 11 10
GND7 GND4
12 9
GSM_OUT GND3
13 8
C523
C504 GND8 GND2
14 7
DCS_PCS_OUT GND1
DNI DNI 15 6
LBAND_PAM_IN
GND9 GSM_IN
16 5
VBATT1 DCS_PCS_IN HBAND_PAM_IN
17 U501 4 R505 1K
VBATT2 VRAMP PA_LEVEL
C513 C512 18 3
L504 VDET SKY77344 ENABLE TXON_PA
19 2
PA_BAND
2.7p 2.7p MODE BS
20 1
2.2p
C505
L506 C507
1.8n 1.8n
4.7n PA_MODE
PCS1900
C530 C500 C531 C509
1u 22u 27p
47p
VRF_1V5 VRF_2V85 VRF_2V85
C537 C536 C535
0.1u 0.1u 0.1u
RF_EN
C516 1n
26MHZ_MCLK
C517
R508
47n
820
7 6 5
- 117 -
4 3 2
4 3 2
1
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LGE Internal Use Only