LG KF700Q Service Manual page 124

4.17.2 Checking RF Tx Level
KMS-507 KMS-507
SW101 SW101
G2 G2
ANT ANT RF RF
G1 G1
TP1
VREG_RF_2.85V VREG_RF_2.85V
C129 C129
ANT_SEL0 ANT_SEL0
ANT_SEL1 ANT_SEL1
ANT_SEL2 ANT_SEL2
ANT_SEL3 ANT_SEL3
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Only for training and service purposes
C105 C105
56p 56p
FL101 FL101
D5015 D5015
18 18
PCS_RX1 PCS_RX1
19 19
PCS_RX2 PCS_RX2
2 16 16
ANT ANT PCN_RX1 PCN_RX1
17 17
PCN_RX2 PCN_RX2
1 14 14
GND1 GND1 EGSM_RX1 EGSM_RX1
8 15 15
GND2 GND2 EGSM_RX2 EGSM_RX2
10 10
GND3 GND3
23 23 12 12
GND4 GND4 GSM850_RX1 GSM850_RX1
24 24 13 13
GND5 GND5 GSM850_RX2 GSM850_RX2
20 20
WCDMA_2100 WCDMA_2100
21 21
WCDMA_850 WCDMA_850
22 22
WCDMA_1900 WCDMA_1900
9
PCN_PCS_TX PCN_PCS_TX
11 11
GSM850_EGSM_TX GSM850_EGSM_TX
33p 33p
C156 C156
TP3
C159 C159
TP2
[Fig. 4.22] Schematic of the GSM Tx Block
[Fig. 4.23] Test Point of GSM Tx Block
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4. TROUBLE SHOOTING
2.2p 2.2p
C102 C102
L104 L104
GSM(869-894 MHz) GSM(869-894 MHz)
L101 L101
18nH 18nH
NA NA
C107 C107 2.2p 2.2p
C110 C110 1.5p 1.5p
L105 L105 L106 L106
GSM(925-960 MHz) GSM(925-960 MHz)
18nH 18nH
NA NA
C115 C115 1.5p 1.5p
C123 C123 1.8p 1.8p
WCDMA_2100 WCDMA_2100
WCDMA_850 WCDMA_850
L108 L108 L109 L109
DCS(1805-1880 MHz) DCS(1805-1880 MHz)
15nH 15nH 3.9nH 3.9nH
C126 C126 1.8p 1.8p
C128 C128 3p 3p
PCS(1930-1990 MHz) PCS(1930-1990 MHz)
L110 L110 L111 L111
NA NA 3.3nH 3.3nH
C131 C131 3p 3p
TP2
+VPWR +VPWR
C152 C152 C153 C153 C154 C154
15p 15p 1000p 1000p
4.7u 4.7u
C157 C157 1.5nH 1.5nH
15p 15p
L112 L112 U102 U102
NA NA
TQM7M5012 TQM7M5012
BAND_SELECT BAND_SELECT
9
GSM_OUT GSM_OUT
DCS_PCS_IN DCS_PCS_IN
15p 15p C160 C160 39p 39p
11 11
DCS_PCS_OUT DCS_PCS_OUT
GSM_IN GSM_IN
L113 L113 7
GND1 GND1 TX_EN TX_EN
6.8nH 6.8nH
12 12
GND2 GND2
VBATT VBATT
6
NC1 NC1
10 10
NC2 NC2 VRAMP VRAMP
RX_GSM_850_M RX_GSM_850_M
RX_GSM_850_P RX_GSM_850_P
RX_GSM_900_M RX_GSM_900_M
RX_GSM_900_P RX_GSM_900_P
RX_DCS_M RX_DCS_M
RX_DCS_P RX_DCS_P
RX_PCS_M RX_PCS_M
RX_PCS_P RX_PCS_P
2
1
8
3
4
5
LGE Internal Use Only