Sony X900E Series Service Manual page 46

FLOW
5. KEY SWITCH BUTTONS ERROR
Resistor value
[BMKS]
R1108 : 0 [ohm]
R1049 : 47k [ohm]
R1222 : 4.7k [ohm]
[BMKP]
R250 : 0 [ohm]
R232 : 47k [ohm]
R1222 : 4.7k [ohm]
Resistor value
[BMKS]
R1028 : 4.7k [ohm]
R1107 : 0 [ohm]
R1050 : 20k [ohm]
R1051: 22k [ohm]
[BMKP]
R1028 : 4.7k [ohm]
R249 : 0 [ohm]
R230 : 20k [ohm]
R231: 22k [ohm]
XBR-49/55/65/75X900E
Side key buttons error
OK
Check harness connection
between B*board and switch
module
NG
OK
Change harness 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
TROUBLE SHOOTING
Harness connection issue
B* board to switch module harness
issue
Switch module issue
Parts issue
Main device issue
Change B* board
46