Side Buttons Malfunction - Sony KD-43X8301C Service Manual

3-6. SIDE BUTTONS MALFUNCTION

Side Key button
malfunction
KD-43/49X8301C (FW-43/49X8370C), 8305C, 8307C, 8308C, 8309C
OK
Change Switch Unit
NG
Harness on Switch Unit
and B* Board properly connected
NG
OK
Change
Switch unit-B* board Harness
NG
Power Key (B*Board)
Check parts value :
0 ohm < R1089 < 2 ohm
4.4k ohm < R1432 < 5k ohm
OK
Power Key Muffin Pin (B*Board)
Check voltage(Power ON condition) :
3.13V < Voltage < 3.47V
NG
Switch unit issue
OK
Harness
connection
issue
Harness issue
NG
Parts Broken issue
OK
Muffin IC1000
problem
Change B*Board
TROUBLE SHOOTING
NG
Key AD(B*Board)
NG
Check parts value :
0 ohm < R1091 < 2 ohm
0 ohm < R1042 < 2 ohm
OK
Key AD muffin pin (B*Board)
OK
Check voltage (Power ON condition):
1.62V < voltage < 1.84V
NG
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