Sony KD-55A8F - 5.0 Key Switch Buttons Error

5.0 Key Switch Buttons Error
Side key buttons error
Harness connection issue
Check harness
connection between
B-board and switch
module
Change switch module
Switch module issue
B-board to switch module
harness issue
OK
Change harness
between B-board to
switch module harness
NG
NG
NG
OK
OK
Main device issue
Change B-board
62
SYSSET
2018/03/1622:32:44(GMT+09:00)