3-3
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ONE POINT REPAIR GUIDE
NO POWER
If the unit doesn’t work by no PVDD problem, repair the set according to the following guide.
1-2. FUSE/ FET
1-2-1. Solution
Please check and replace F901, Q901 on SMPS board.
1-2-2. How to troubleshoot (Countermeasure)
1) Check if the fuse F901 is open or short-circuit.
2) Check the anode-cathod voltage of D951 with a digital multi-meter, it is normally 0.2 ~ 0.3 V.
If it doesn’t have any voltage, it’s destroyed. Replace it with a new one.
1-2-3. Service hint (Any picture/ Remark)
N6
N4
N2
N7
N1
N3
N5
S1
S2
S3
P3
P2
P1
GND
C952-*1
2200uF/50V
C953-*1
2200uF/50V
PC903
12
3
4
R951
22K
1%
IC951
R954
1K
C951
470P/1KVDC
R955
1.8K
R957
47K
1
2
R958
47K
1
2
R961
220
R952
2.2K
12
R962
220
R953
1K
D951
SF20A400HPI
C952
2200uF/63V
C953
2200uF/63V
R971
2K
Q950
KRC103S
1
E
2C
3
B
HS955
MED61841613
1
2
GND
R972
1.5K
25x15
HS952
1
2
3
4
GND
T904
2
4
5
6
7
11
12
13
14
15
16
17
9
18
T903
1
3
7
8
11
12
13
14
15
16
R959
47K
R960
47K
ZD932
Z02W20VY
1
N
2
C
3
A
R956
1K
C956
1uF
TP910
TP911
TP912
TP913
TP914
TP915
!
!
MED62731209
!
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