LG GT540 - Page 100

- 101 -
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. Trouble Shooting
U100
31
30
29
44
43
42
41
40
39
38
73 6
3
53
16
15
4
1
31
21 11
0
1
34
33
32
17
9
18
8 19
7 20
6 21
5 22
4
32
3
42
2
52 62 72 82
1
DCS_PCS_IN
11DNG
01DNG 9
D
N
G
8DNG
GND1
7DNG
GSM_IN
6DNG
VAPC
GND5VBATT
GND4BS2
GND3BS1
GND2_TXEN
ANT
EDOM
WCDMA3
PGND4
PGND5
PGND6
PMET
4X
R
3XR
2XR
1X
R
WCDMA1
WCDMA2
7DNGP 8
DN
GP
9DNGP
PGND10
PGND11
PGND12
PGND13
PGND14
PGND15
PGND16
PGND1
PGND2
PGND3
301R
021
L100
18nH
L101
18nH
L102
10n
12n
L103
001R
021
100n
L107
ANT101
VBAT
51
R104
68n
L108
10u
C113
L109
DNI
5.6n
L110
L111
DNI
DNI
L112
56p
511C
611C
56p
C117 100p
811C
1.2n
100pC119
2.7n
C120
FL101
1960MHz
45
1
32
G1 O1
IN
G2 O2
FL102
1842.5MHz
45
1
32
G1 O1
IN
G2 O2
942.5MHz
FL103
45
1
32
G1 O1
IN
G2 O2
881.5MHz
FL104
45
1
32
G1 O1
IN
G2 O2
321C
1.2n
C124
2.7n
621C
8.2n
68n
L113
100p
C128
9
31
C
8.2n
L114
8.2n
19
901R
ANT102
39p
C149
8.2n
051C
8.2n
151C
R110
82
C153 1n
1nC155
5.6n
L115
2.2n
L139
19
111R
DNI
C157
33pC159
6.8p
R112
100p
C160
DNI
R113
1nC162
C164 1n
2.2K
R117
47p
C179
SW100
G1
A
C
G2
GND
WCDMA_1900_RTX
WCDMA_2100_RTX
DCS_PCS_TX
RX_PCS_P
RX_PCS_M
RX_DCS_P
RX_DCS_M
RX_GSM_900_P
RX_GSM_900_M
RX_GSM_850_P
RX_GSM_850_M
GSM_TX
GSM_PA_RAMP
ANT_SEL0
ANT_SEL1
ANT_SEL3
ANT_SEL2
WCDMA_900_RTX
0603
2mm
11dB
DCS(1805-1880 MHz)
PCS(1930-1990 MHz)
GSM(925-960 MHz)
GSM(869-894 MHz)
7dB
GSM850(824-849MHz)
8061
GSM900(880-915MHz)
PCS(1850-1910 MHz)
DCS(1710-1785 MHz)
0603
0603
TP1
TP3
TP2
Check TCXO Block Refer to 1.3
Check TP1
If GSM over 31 dBm?
If DCS/PCS over 28 dBm?
GSM/DCS/PCS Tx is OK
Check other part
Yes
No
Change the board
Check TP2, 3
If GSM(TP2) under 6 dBm?
If DCS/PCS(TP3) over 6 dBm?
Check ANT SW Block (ASM+EDGR PAM)
Refer to 1.4
Yes
No
Check RTR & PAD
Check soldering and components
No Problem
Still exist Problem
START