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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.
2-7. IC207 System 1.05 VA (No 1.05 VA)
2-7-1. Solution
Replace MAIN board.
2-7-2. How to troubleshoot (Countermeasure)
1) Please check 5.1 VA of IC207 pin1 (VIN).
2) If 5.1 VA is abnormal, please check IC201.
3) If 5.1 VA is OK, but 1.05 VA is abnormal pin2 of IC207(VOUT), replace MAIN board.
2-7-3. Service hint (Any picture / Remark)
PWR_CTL
C235
10pF
DGND
R233
R238
13K (1%)
3.9K (1%)
DGND
ONE POINT REPAIR GUIDE
R272
4.7K
6
F
B
I V
E
N
5
S
B
S
T
4
G
N
C2A6
1nF_NC
R250
33
C245
DGND
R242
220 (1%)
VOUT = 0.798x((3.9K+220)/13K+1)= 1.05V
IC207
IC207
< MAIN board top view >
C250
100nF
1
N
L212
2
W
4.7UH
3
D
DGND
1uF (1)
3-36
Copyright © 2020 LG Electronics Inc. All rights reserved.
5.1VA
L216
C255
C261
10uF
10uF
/16V
/16V
1.05VA_STB
DGND
R257
0OHM
C256
C262
C267
C2B4
10uF
10uF
10uF
100nF
/16V
/16V
/16V
DGND
Only for training and service purposes.
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