Sony KD-55X8 G Series Service Manual page 90

5.0 Key Switch Button Error
Side key buttons error
Resistor value
R1279 : 47k [ohm]
R1505: 4.7k [ohm]
Resistor value
R1353 : 4.7k [ohm]
R1277 : 20k [ohm]
R1278: 22k [ohm]
TV Business Division
Check harness
OK
connection between
B-board and switch
module
NG
Change harness
OK
between B-board to
switch module
harness
NG
OK
Change switch
module
NG
NG
Check resistor value
on B-board
OK
In case that power
key error
NG
Check resistor value
on B-board
In case that buttons error except power key
OK
Harness connection issue
B-board to switch module
harness issue
Switch module issue
Parts issue
Main device issue
Change B-board
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