LG SPM2 - One Point Repair Guide

3-4
Copyright © 2022 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ST-BY5V
VIN
EN
VFB
SW
VBST
GND
R3 R2
Vout=0.596 x { 1 + (R2/R3)}
670mA
Improved Ripple noise
R809
0
R808
100K/F
R807
13.3K/F
C810
50V/0.1uF
C819
50V/0.1uF
R806
510K
R822
100K
C817
10V/1uF
C818
10V/10uF
C820
50V/0.1uF
C821
50V/0.01uF
C814
50V/0.1uF
C816
50V/0.01uF
L804
220ohm/2200mA
L805
CKST0603-10UH/M
L806
220ohm/2200mA
C813
25V/220uF
C815
50V/1uF
C822
50V/0.01uF
C823
10V/0.1uF
123
4
56
IC801
C811
50V/120pF
ZD807
OPEN
R823
47K
C824
16V/220uF
DGND
STBY_5V
ONE POINT REPAIR GUIDE
1. NO BOOTING WHEN YOU TURN THE UNIT ON, STANDBY LED DOESN’T WORK
When you turn on your set, LED doesn’t work.
1-1. IC801 STBY_5V
1-1-1. Solution
Replace MAIN board.
1-1-2. How to troubleshoot (Countermeasure)
1) Please check 20 VA of IC801 pin3(VIN).
2) If 25 VA is abnormal, please check SMPS.
3) If 25 VA is OK, but STBY_5V is abnormal pin2 of IC801 (VOUT), replace MAIN board.
1-1-3. Service hint (Any picture / Remark)




IC801
IC801
L805
L805
< MAIN board top view >