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KDL-40HX850, KDL-40HX853, KDL-40HX855, KDL-46HX850, KDL-46HX853, KDL-46HX855, KDL-55HX850, KDL-55HX853, KDL-55HX855 (serv.man2) - Sony TV Service Manual (repair manual). Page 111

Read Sony KDL-40HX850 / KDL-40HX853 / KDL-40HX855 / KDL-46HX850 / KDL-46HX853 / KDL-46HX855 / KDL-55HX850 / KDL-55HX853 / KDL-55HX855 (serv.man2) Service Manual online

KDL-40/46/55HX850,853,855(AEP/UK/IT)
111
TROUBLE SHOOTING
3-3. NO POWER
No power
Check STBY_+3.3V
at 10 pin of CN6001
on the B* board
Harness
G* board
Replace the harness
between G* board and
B* board
B* board
NG
OK
NG
Symptom 
improvement
Long AC off
(> 15 min.).
Power protection or
CPU abnormal stop
NG
OK
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