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KDL-40HX750, KDL-46HX750, KDL-55HX750 - Sony TV Service Manual (repair manual). Page 87

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KDL-40/46/55HX750(CH)
87
1) 2 times blinking (Main Power Error)
TROUBLE SHOOTING
3-4. STANDBY LED BLINK
2 times blinking
Check REG+12V at
pins 3/5 of
CN6001 on
the B* Board
B* Board
Harness
G* Board
Replace
Between G* Board to
B* Board Harness
12V NG
12V OK
NG
Symptom 
improvement
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