Read Sony KDL-43W780C Service Manual online
12
Troubleshooting
Case 1 : Check 3.3V DDCON
Remove Harness CN1001
and Check C1042,
Is the Power line
short to ground?
Yes
DDCON IC1002
broken
Check 3.3V DDCON
Check F1004,
Is the voltage > 18V?
Yes
No
FUSE F1004
broken
No
B* Board
NO POWER: DC/DC converter check
Symptoms
Remove Harness CN1001
and Check C1042,
Is the voltage > 3.3V?
No
DDCON IC1002
broken
Yes
Case 2 : Check 12V DDCON
Remove Harness CN1001
and Check C1024,
Is the Power line
short to ground?
Connect Harness CN1001
and Check Pin 3 IC1001,
Is the voltage > 3V?
Yes
DDCON IC1001
broken
Check 12V DDCON
Check F1003,
Is the voltage > 18V?
Yes
No
FUSE F1003
broken
No
B* Board
NO POWER: DC/DC converter check
Symptoms
DDCON IC1001
broken
Yes
No
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