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U880
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Checking Vco Block - LG U880 Service Manual
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User manual
(132 pages)
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,
Brochure
(8 pages)
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Contents
Table of Contents
Troubleshooting
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Table of Contents
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4. TROUBLE SHOOTING
4.6.1 Checking VCO Block
TP2
TP1
TP3
TP6
TP5
R1027
24
R1032
15
R1034
51
Test Point (TXVCO Level)
TP1
TP4
TP2
925-960 MHz
C1086
1000p
L1015
9.1nH
L1028
10nH
MQW5V0C869M
U1003
10
3
VC
VB
1
9
OUT_GSM
SW1
5
11
OUT_DCSPCS
SW2
8
2
GND5
GND1
12
4
GND6
GND2
13
6
GND7
GND3
14
7
GND8
GND4
Schematic of RF TXVCO
- 88 -
TP4
TP6
TP3
R1037
82
C1083
C1085
120p
1000p
FB1000
VREG_RFTX_2.85V
R1025
100
GSM_TX_VCO_0_EN_N
R1026 100
GSM_TX_VCO_1_EN_N
VREG_MSMP_2.7V
VREG_RFTX_2.85V
TP5
38
VDDA11
39
TX_MOD_CP
40
VDDA12
41
C1084
(PPS)
TX_VCO_FB
42
22n
C1079
82p
R1036
47
R1030
51
C1076
C1081
C1072
0.1u
0.01u
22p
C1077
C1080
C1073
10u
0.1u
100p
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Table of Contents
Troubleshooting
TROUBLE SHOOTING
73
Audio Trouble Shooting
109
Charger Trouble Shooting
119
Troubleshooting Download Errors
135
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