LG KF390 Service Manual page 75

4. TROUBLE SHOOTING
4.2.3 Checking GSM RF TX Level
SW1000 C1004
G2
ANT RF
G1
56p
KMS-507
2
TP1
002 AN1003
LGE Internal Use Only
TP2
FL1000
D5015
18
PCS_RX1
19
PCS_RX2
2 16
ANT PCN_RX1
17
PCN_RX2
1 14
GND1 EGSM_RX1
8 15
GND2 EGSM_RX2
10
GND3
23 12
GND4 GSM850_RX1
24 13
GND5 GSM850_RX2
20
WCDMA_2100
21
WCDMA_850
22
WCDMA_1900
9
PCN_PCS_TX
11
GSM850_EGSM_TX
[Fig.] the schematic of FEM Block
[Fig.] Test Point of GSM TX Path Block
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TP4
+VPWR
C1063 L1008
6.8nH
68p
L1009
1p
C1065
L1010
56p
15p
L1011
3.9nH
TP3
TP1
TP2
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
C1059 C1062
C1060
4.7u 15p
1000p
2
BAND_SELECT
9
GSM_OUT
1
DCS_PCS_IN
11
DCS_PCS_OUT
8
GSM_IN
U1001
7 3
TQM7M5012
GND1 TX_EN
12
GND2
4
VBATT
6
NC1
10 5
NC2 VRAMP
TP4
TP3