- 134 -
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
4.16.2 Step 2
Figure 4-4. Step 2 : GSM PAM Block
d
Step 2
Check VBATT (C107)
in GSM PAM Block
d
to Check if main power
source input or not
Check (C335 & C107)
in Block
d g
to check inner line connection
From C335 to C101
Check Point (C335)
in Power Source Block
g
To Check Power source
Yes
No
Proceed to the Step 3
No
Yes
Check The PowerSupply
Open?
No
Yes
Change Board
C101
GSM PAM
TP03
(C107)
TP03
(C107)
Solder again Check Component
(CN301)
In Power Source Block
g
3.4~4.2V
OK?
3.4~4.2V
OK?
REV.1.1
Rev. F
REV.1.1
Rev. E
27p
C122
G1
G2
C121
22nH
SW101
KMS-518
A
C
DNI
smd_0603h_25_r_na
R106
34
PGND4
RSVD
10
RX1
16
15
RX2
RX3
14
13
RX4
4
VAPC
VBATT
5
WCDMA1
18
19
WCDMA2
WCDMA3
20
_TXEN
8
29
GND12
GND13
30
11
GND2
GND3
12
21
GND4
GND5
22
23
GND6
GND7
24
25
GND8
GND9
26
1
HB_RF_IN
LB_RF_IN
3
9
MODE
31
PGND1
32
PGND2
PGND3
33
SKY77521
U102
17
ANT
BS1
7
6
BS2
2
GND1
27
GND10
GND11
28
C115
R105
22p
DNI
C105
22p
R180
51
NA
L103
R104
0
0ohm_0603_case1
C106
0.01u
R109
DNI
8.2p
C116
R107
1.5nH
10u
C107
GRX_900
GRX_1800
GRX_1900
WRF_BAND_2
GTX_VAM
GRX_850
WRF_BAND_5
TP03
(C107)
Содержание TU750
Страница 1: ...Service Manual Model TU750 Internal Use Only Service Manual TU750 Date January 2009 Issue 1 0 ...
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