Side Buttons Malfunction - Sony KDL-65W850C Service Manual

3-6. SIDE BUTTONS MALFUNCTION

Side Key button
malfunction
KDL-65W850C, 855C, 857C, 75W850C, 855C
OK
Change Switch Unit
NG
Harness on Switch Unit
and B* Board properly connected
NG
Change
Switch unit-B* board Harness
NG
Power Key (B*Board)
Check parts value :
0 ohm < R1089 < 2 ohm?
OK
Power Key Muffin Pin (B*Board)
Check voltage(Power ON condition) :
3.287V < Voltage < 3.55V?
NG
Switch unit issue
OK
Harness
connection
issue
OK
Harness issue
NG
NG
Parts Broken issue
OK OK
Muffin IC1000
problem
Change B*Board
TROUBLE SHOOTING
NG
Key AD(B*Board)
Check parts value :
0 ohm < R1085 < 2 ohm?
OK
Key AD muffin pin (B*Board)
Check voltage (Power ON condition):
1.53V < voltage < 1.89V?
NG
Size B* Board G* Board
65"
BMX
75"
BMX
GL1SB
GL1C
44