Side Buttons Malfunction - Sony KDL-40W900A Service Manual

Troubleshooting

3-7. SIDE BUTTONS MALFUNCTION

HUS button
malfunction malfunction
Change HUS
NG?
■ Execute SIDE BUTTONS
i.Start Side Key check with diag sidekey_check.
ii.Push Side Key : CH+
when [MESSAGE] PLEASE PUSH [ CH+ ] KEY is displayed.
iii.Push Side Key : CH- iii P h Sid K CH
when [MESSAGE] PLEASE PUSH [ CH- ] KEY is displayed.
iv.Check that diag sidekey_check result OK is returned.
 When this check result is NG.
Check Harness on HUS and
B* Board properly connected
NG
Loose harness 
connect properly
↓
Check Harness pin Assignment
According to circuit.
OK
NG
Change Harness
RB1G
W900A/904A/905A
Probe at Key_AD line and y_
check the signal
OK
OK
Change B* Board
(*)
Size B* Board Type
OTHERS
40" BA2-S BA2-W
46" BA2-S BA2-W
55" BA2-S BA2-W
CHASSIS
JP
206