Read Sony XBR-43X830C / XBR-49X830C / XBR-49X835C / XBR-49X837C / XBR-49X839C Service Manual online
XBR-43X830C, 49X830C, 835C, 837C, 839C
122
TROUBLE SHOOTING
3-6. SIDE BUTTONS MALFUNCTION
Side Key button
malfunction
Harness on Switch Unit
and B* Board properly connected
Change
Switch unit-B* board Harness
Harness
connection
issue
Change B*Board
Change Switch Unit
Switch unit issue
Harness issue
OK
NG
NG
OK
OK
Power Key (B*Board)
Check parts value :
0 ohm < R1089 < 2 ohm
4.4k ohm < R1432 < 5k ohm
Muffin IC1000
problem
NG
Power Key Muffin Pin (B*Board)
Check voltage(Power ON condition) :
3.13V < Voltage < 3.47V
NG
OK
NG
Key AD(B*Board)
Check parts value :
0 ohm < R1091 < 2 ohm
0 ohm < R1042 < 2 ohm
NG
OK
Parts Broken issue
Key AD muffin pin (B*Board)
Check voltage (Power ON condition):
1.62V < voltage < 1.84V
NG
OK
OK
NG
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