LG SH2 Service Manual

3-7
ONE POINT REPAIR GUIDE
6. PROTECTION
6-1. Protection-1
6-1-1. Solution
Replace IC701, IC702 (AMP IC) on MAIN board.
6-1-2. 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 PVDD voltage (21 V) of PN601 pin1, 2.
- If PVDD voltage has 6.0 V under, refer to SMPS board repair guide.
4) Check SVCC33 voltage (3.3 V) of IC701, IC702 pin13, 27.
- If SVCC33 voltage has 2.7 V under, refer to 3.3 V no power repair guide.
5) Check impedance (4 Ω) of speaker unit.
- If impedance of speaker unit has 2 Ω under, replace speaker unit .
6) If check point 3), 4), 5) is OK, replace IC701, IC702 (AMP IC) on MAIN bottom board.
6-1-3. Service hint (Any picture / Remark)
< MAIN board bottom view >
< MAIN board top view >
0V
0V
GD AMP SCL
( )
21V
0036A
Rev 2.0
option
21V
CHECK
Assy No
0036B
AMP SDA
6
3
Q754
D751
C926
C744
C754
R722
C764
R721
R716
R717
C705
C
625
R177
R125
R129
R123
C206
3
3
R662
R661
RA100
C144
C142
R757
D752
C748
C750
C726
C720
C722
C735
C712
C928
R184
R145R147
R203
R136
R152
FB652
R
ZD6
2
R19J
C127 R176
C621
R162 R169
R182
C128
RA102
RA104
RA101
C143
C725
8 0
C612
RA103
C626
5
3
6
5
D753
C605
R769
R767
R772
R758
R732
R707
C723
C703
R733
R704
C708
R701
R703
C
611
R179
R138 R139
R131
R132
R133
R146
R128
R106
R107
R108
R109
R105
R111
R104
IC106
APX809
C126
R167
R171
R180
R19B R19A R19C R19D
R19H
R189
C148
ZD661
C606
L601
Q751
R728 C759
R727 C746
C743
PN703
C761
C757
PN702
10
PN5
0
Q752
C721 C737
PN701
C752
C701
C704
IC921
PCM1808
R149 R144
R140 R148
R137
R121
R126
R124
Q121
Q122
R235 R917 R234 R232
R237 C231 R236 R233
C222
C103
R103
R19K R19G R19Q R19P
FB651
R151
C145
FB641
Q661
C
753
C613
L602
L603
C627
C634
R729
R735
R715
R714
R912
X101
24M
C601
IC604
AP6503
L703
R231
C223
PN5
0
PN261
Bt Module
L701
To Touch Led
PN110
R19ER19F
C153
PN601
POWER
L702
R
E
K
15
110
A
5
IC101
MLC3730S
IC701
IC701
(AMP IC)
(AMP IC)
IC702
IC702
(AMP IC)
(AMP IC)
PN601
PN601

LG SH2 Specifications

General

Surround Sound	other
Inputs	optical digital audio
Outputs	none
HDMI Inputs	0
HDMI Outputs	0
USB Ports	0
Bluetooth	yes
Wireless Connectivity	bluetooth
Optical Audio Inputs	1
Remote Control	yes

Weight and Dimensions

Depth	3.5 inches
Height	2.4 inches
Width	34.6 inches
Net Weight	4 pounds