Sony A1E Series Service Manual page 34

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-55/65/77A1E
BL_ON (L or H): IC401 #7pin
No
Check Smart Core
Check
Behavior BL_ON
(5x Blinking) on the BKA board
Yes
Power μ-com
(Refer NO POWER
5x Blinking
U-COM FAILURE)
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 BKA board
Symptom
improvement
BKA board NG
Panel
34