LG DS80QY.DDEULLK Service Manual

3-4
Copyright © 2022 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
IC3025
1
COMP
2
FB
3
EN
4
GND
5
SW
6
IN
7
FSEL
8
SS
L3032
10uH
D3001
SS1040FL
40V
C3166
10nF
/50V
R3120
0
DGND
DGND
R3121
51K
R3122
27K
R3127
82K
R3128
4.3K
R3135
10K
C3167
1nF
/50V
R3125
20K
DGND
12V
C3169
10uF
/25V
C3168
10uF
/25V
C3165
100nF
/16V
C3164
10uF
/10V
L3031
220
DGND
C3170
100nF
/25V
C3190
10uF
/25V
C3191
10uF
/25V
NC
C3192
10uF
/25V
NC
C3193
10uF
/25V
NC
DGND
VCC_5V
VCC_5V
Boost Converter for 12V LCD
ONE POINT REPAIR GUIDE
1. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR
“HELLO” ON FRONT PANEL
When you turn on your set, no message on the front panel, and LED doesn’t work.
1-1. IC3025 System 12 V (No 12 V)
1-1-1. Solution
Replace MAIN board.
1-1-2. How to troubleshoot (Countermeasure)
1) Please check 5.1 VA of IC3025 pin6(VIN).
2) If 5.1 VA is abnormal, please check IC7009 of AMP board.
3) If 5.1 VA is OK, but 12 V is abnormal pin5 of IC3025(VOUT), replace MAIN board.
1-1-3. Service hint (Any picture / Remark)
< MAIN board top view >
IC3025
IC3025

LG DS80QY.DDEULLK Specifications

General

Brand	LG
Model	DS80QY.DDEULLK
Category	Speaker System
Language	English