Sony XBR-55X850D Service Manual page 44

FLOW
4-1. NO PICTURE
No Picture
No
Got Any Normal
Display?
Yes
Check Other
Portion:
Ext. Video Input -
No Picture
HDMI - No Picture
Tuner - No Picture
XBR-55X850D/857D, 65X850D/855D/857D, 75X850D
BL_ON (L or H):
Check Smart Core No Check
Behavior BL_ON
(5x Blinking) on the main board
Yes
5x Blinking Backlight
IC9017 #18pin (for 4K BMFW2/BM1 board)
BL_ON : H
Replace
the V by One FFC
Harness
Symptom
BL_ON : L
improvement
V by One FFC
Harness
TROUBLE SHOOTING
NG NG
Replace
the main Board
Symptom
improvement
Main board NG
LCD Panel
(or T-CON)
44