Sony KD-55X8500A Service Manual page 114

Backlight Issue
No Picture
All blue picture is on?
(Factory SW is booted.)
Yes
B* Board
KD-55/65 X8500A/ X8504A
No
OK
Check the G*- LD*
Harness
NG
Harness
Replace
NG
the B-Tcon, B-LD*
FFC
Symptom Symptom
improvement improvement
B-Tcon, B-LD*
FFC
Change G* Board
Symptom
improvement
G* Board
TROUBLE SHOOTING
NG
Change B* Board
B* Board
NG
LCD Panel
(T-con, LD*)
114