Side Buttons Malfunction - Sony KDL-43W7 C Series Service Manual

Troubleshooting

3-5. SIDE BUTTONS MALFUNCTION

Side Key button
malfunction
OK
Change Switch Unit
NG
OK
Harness on Switch Unit
and B* Board properly connected
NG
OK
Change
Switch unit-B* board Harness
NG
NG
Power Key (B*Board)
Check parts value :
0 ohm < R1089 < 2 ohm?
OK
OK
Power Key Muffin Pin (B*Board)
Check voltage(Power ON condition) :
3.287V < Voltage < 3.55V?
NG
Switch unit issue
Harness
connection
issue
Harness issue
NG
Parts Broken issue
OK
Muffin IC1000
Check voltage (Power ON condition):
problem
Change B*Board
NG
Key AD(B*Board)
Check parts value :
0 ohm < R1085 < 2 ohm?
OK
Key AD muffin pin (B*Board)
1.53V < voltage < 1.89V?
NG
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