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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 116

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)
116
TROUBLE SHOOTING
5) 6 times blinking (Backlight Power Error)
6 time blinking
Check
BACKLIGHT_MON
at JL6017
on B* board
B* board
Under 2.65V
Over 2.65V
Check the harness
between G* board
and B* board.
G-B harness
NG
OK
LD board
NG
G* board
Symptom 
improvement
Change G* board
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