Sony KD-43X7 G Series Service Manual page 113

2.9 Key Switch Buttons Error
Side key buttons error
Resistor value
[BB9]
R9507 : 0 [ohm]
R5063 : 100 [ohm]
R9512 : 4.7k [ohm]
Resistor value
[BB9]
R3023: 100 [ohm]
R9509: 12k [ohm]
R9510: 33k [ohm]
Check harness connection
between B-board and
switch module
NG
Change harness between
B-board to switch module
harness
NG
Change switch module
NG
Check resistor value on B-
board
OK
In case that power key error
Check resistor value on B-
board
In case that buttons error except power key
OK
OK
Harness connection issue
OK
B-board to switch module
harness issue
OK
Switch module issue
NG
Parts issue
NG
Main device issue
Change B-board
113
SYS SET