LG SH2, Service Manual

Page: 21 / 39

3-8
ONE POINT REPAIR GUIDE
PROTECTION
6-2. Protection-2
6-2-1. Solution
Replace IC701, IC702 (AMP IC) on MAIN board.
6-2-2. How to troubleshoot (Countermeasure)
1) After MAIN SET power off, check Red LED blink at intervals of 1 sec.
2) Turn MAIN SET power on again.
3) Check voltage 3.3 V of AMP_FAULT signal (pin14 of IC701, IC702).
4) If pin14 of IC701, IC702 is low (0 V), Replace IC701, IC702 (AMP IC) on MAIN bottom board.
6-2-3. Service hint (Any picture / Remark)
< MAIN board top view >
0V
0V
GD AMP SCL
( )
21V
0036A
Rev 2.0
option
21V
CHECK
Assy No
0036B
AMP SDA
P/N : 6870S 0036A
SH2 PV [MAIN]
2015. 11. 27
6
3
Q754
D7
5
1
C9
2
6
C744
R935
R936
C922
C921
C7
5
4
R722
C
764
R721
R716
R717
C7
0
5
C
625
R177
R1
2
5
R129
R123
C206
3
3
R6
6
2
R661
RA
1
0
0
C144
C142
R757
D7
5
2
C7
4
8
C7
5
0
C7
2
6
C720
C722
C735
C7
1
2
C928
R184
R1
4
5
R1
4
7
R203
R1
3
6
R1
5
2
FB652
R
664
ZD
622
R1
9
J
C1
2
7
R1
7
6
C
621
R1
6
2
R1
6
9
R1
8
2
C128
RA
1
0
2
RA
1
0
4
RA
1
0
1
C143
C7
2
5
8 0
C612
RA
1
0
3
C6
2
6
5
3
6
5
D
753
C605
R7
6
9 R767
R
772
R758
R732
R
707
C723
C703
R733
R704
C708
R701
R7
0
3
C927
C924
R938
C
611
R179
R1
3
8
R1
3
9
R131
R132
R133
R146
R128
R106
R107
R108
R109
R105
R111
R104
R217
R221
R222
IC106
APX809
C126
R167
R1
7
1
R180
R1
9
B
R1
9
A
R1
9
C
R1
9
D
R19H
R189
C148
ZD
661
R665 FB654
C606
L601
Q751
R7
2
8
C7
5
9
R7
2
7
C7
4
6
C743
PN703
C761
C757
PN702
C1
7
4
C1
7
5
C1
7
6
C1
7
7
10
PN506
Q752
C7
2
1
C7
3
7
PN701
C752
C701
C704
IC921
PCM1808
R1
4
9
R1
4
4
R1
4
0
R1
4
8
R137
R121
R126
R124
Q121
Q122
R2
3
5
R9
1
7
R2
3
4
R2
3
2
R2
3
7
C2
3
1
R2
3
6
R2
3
3
C222
C103
R103
X201
24.576MHz(SX-1)
CS8422
IC201
R1
9
K
R1
9
G
R1
9
Q
R1
9
P
C
1
C
1
FB651
R151
C145
FB641
W25Q32FVS
IC105
Q661
C
753
C613
L602
L603
C6
2
7
C634
R729
R735
R715
R714
R912
R218
R223
R224
X101
24M
C601
IC604
AP6503
L703
R2
3
1
C223
PN507
C
1
10
PN261
Bt Module
L701
To Touch Led
PN110
R1
9
E
R1
9
F
C1
5
3
DOWNLOAD JIG
PN601
POWER
L702
R
E
K
15 1 10
A
5
IC101
MLC3730S
R701 R701
R733 R733
< MAIN board bottom view >
IC701 IC701
(AMP IC) (AMP IC)
IC702 IC702
(AMP IC) (AMP IC)