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4.5 Checking UMTS Block
4.5.1 Checking TX level
KMS-518
TP1
SW100
C101
120p
L102
NA
FL100
5
10
VC1
ANT
4
VC2
3
6
VC3
VDD
7
NC
1
GND1
2
8
GND2
UMTS_TX_RX
9
13
GND3
DCS_PCS_TX
11
16
GND4
EGSM_TX
12
GND5
14
19
GND6
DCS_RX2
15
20
GND7
DCS_RX1
17
21
GND8
PCS_RX2
18
22
GND9
PCS_RX1
25
23
PGND1
EGSM_RX2
26
24
PGND2
EGSM_RX1
LSHS-M090UH
2.2nH
L121
FL103
SAYZY1G95EB0B00
C167
C168
56p
56p
L125
1.2nH
PQ
TP1
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Only for training and service purposes
TP2
C152
3.9p
+VPWR
C160
22u
U104
C170
SCDY0003403
C169
5.6p
1.8p
4.7nH
L128
20dB
R124
R123
51
PWR_DET
68
R125
R126
100
100
8 dB
Schematic of the WCDMA Tx Block
Test Point of the WCDMA Tx Block
4. TROUBLE SHOOTING
C162
C163
C164
0.01u
100p
1u
L124
3.3nH
U105
11
GND5
10
1
VCC2
VCC1
9
2
GND4
RFIN
8
3
RFOUT
GND1
7
4
GND3
VMODE
6
5
GND2
VREF
Q100
L126
8.2nH
AWT6277R
C173
100p
KRX102E
TP3
TP2
- 101 -
TP4
FL104
EFCH1950TDF1
C159
8.2p
C161
4
5
O1
G3
1
IN
WCDMA_2100_TX_OUT
G2
G1
L123
56p
3
2
15nH
C165
L122
NA
NA
PA_R1
VREG_TCXO_2.85V
PA_ON
TP4
TP3
LGE Internal Use Only
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Troubleshooting
