Read Sony KDL-43W780C Service Manual online
11
3-1. NO POWER
SECTION 3
TROUBLESHOOTING
Troubleshooting
No Power
Check STBY 3.3V
L9107 or C9179
Harness
broken
Replace
LD-board
to B-board
harness
B* Board
NG
OK
NG
OK
DC/DC converter check
NO POWER: Ayu2 control
Replace
LD-board
LD- board
broken
NG
OK
3-1-1. NO POWER
3-1-2. NO POWER – LD Board
Board PWB ( A side )
Detail
L9179
C9179
No Power
Check F1002,
Is the voltage > 18V?
No
DC Adaptor
broken
Check D1001,
Is the voltage > 18V?
No
FUSE F1002
broken
Check Q1004,
Is the voltage > 18V?
No
MOSFET Q1004
broken
Check C1042,
Is the voltage > 3.3V?
No
Case 1 :
Check 3.3V DDCON
Check C1024,
Is the voltage > 12V?
No
Case 2 :
Check 12V DDCON
Yes
Yes
Yes
Yes
OK
Yes
B* Board
NO POWER: DC/DC converter check
Symptoms
Check connection
Harness CN1001
NG
Harness CN1001
broken
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