3-13
Copyright © 2019 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
H:2.55mm
R7A2
R7A3
R7B0
R7B1
R7B4
R7B9
R7C0
C7A2
C7A3
ZD7
ZD703
FR+
Q708
Q709
L709
L710
R30
R30
R306
JK502
R307
FL+
FL-
R328
R715
R716
R33
C302
R340
C306
REMO_TP
C707
C708
C731
C736
C737
R774
C738
C351
R775
C739
R777
C741
R782
R783
R784
R785
C753
C754
C755
C756
IC703
ONE POINT REPAIR GUIDE
PROTECTION ERROR
No display or No Sound.
3-2. B(BURNT) PROTECTION
3-2-1. Solution
Replace MAIN board.
3-2-2. How to troubleshoot (Countermeasure)
1) Check voltage 12 V of IC703 at pin1 ~ 2, if 12V has problem refer to STEP 1-1.
2) If 12 V is OK, replace MAIN board.
3-2-3. Service hint (Any picture / Remark)
IC703
AMP_FAULT
C738 1uF
C736 100pF
R7A3
0
R782 100
C731 100nF
AMP_PROTECT
R775 47K
PGND
R783 NC
PGND
DC_PROTECTION
R702
27K
C739 1uF
PGND
R777 100
C730 1uF
R715
47K
R703
10K
ZD702
Z02W3.9V
NC
1
2
3
C706 100pF
VCC33
IC703
26
GND
1
GVDD_AB
11
GND
35
OUT_B
3
OC_ADJ
8
DVDD
6
INPUT_B
34
GND
27
OUT_D
33
GND
7
C_START
5
INPUT_A
30
PVDD_CD
9
GND
28
OUT_D
10
GND
29
PVDD_CD
4
/RESET
31
PVDD_CD
36
PVDD_AB
2
VDD
32
OUT_C
12
GND
25
GND
13
AVDD
14
INPUT_C
23
BST_D
24
BST_C
15
INPUT_D
22
GVDD_CD
16
/FAULT
21
M3
17
/OTW
18
/CLIP
19
M1
20
M2
37
PVDD_AB
38
PVDD_AB
39
OUT_A
40
OUT_A
41
GND
42
GND
43
BST_B
44
BST_A
R7A2
NC
ZD701
KDZ13V-RTK/P
NC
C741 10uF
AMP_PDN
C737 1uF
R774
3.3
+12V
C708
100pF
R716
4.7K
C707
100pF
R784 2.2K
ZD703
Z02W3.9V
1
2
3
FL_OUT_N
FL_OUT_P
FR_OUT_P
FR_OUT_N
FRONT L
FRONT R
< MAIN board bottom view >
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Weight and Dimensions
