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NO BOOTING WHEN YOU TURN THE UNIT ON, NO GREEN LED ON
FRONT PANEL
When you turn on your set, Green LED doesn't work, it will not boot-up.
2-8. IC208 System 8V_LD (No 8 V)
2-8-1. Solution
Replace MAIN board.
2-8-2. How to troubleshoot (Countermeasure)
1) Please check 12 VA of IC208 pin2 (VIN).
2) If 12 VA is abnormal, please check SMPS.
3) If 12 VA is OK, but 8 V is abnormal pin3 of IC208(VOUT), replace MAIN board.
2-8-3. Service hint (Any picture / Remark)
[12VA TO 8V_LD]
ONE POINT REPAIR GUIDE
IC208
8
GND
7
GND
6
GND
5
GND
FLG/ADJ
DGND
VOUT = 1.24x(8.2K/1.5K+1)= 8V
< MAIN board bottom view >
1
EN
2
VIN
3
VOUT
4
C242
1nF
_NC
2 R
6 4
1
5 .
K
DGND
DGND
IC208
IC208
3-37
Copyright © 2020 LG Electronics Inc. All rights reserved.
12VA
PWR_CTL5
L213
C265
100nF
DGND
8V_LD
R259
0OHM
C236
2 R
5 4
100nF
8
2 .
K
(1%)
DGND
Only for training and service purposes.
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