KDL-26EX550, KDL-32EX550, KDL-32EX650, KDL-40EX650, KDL-46EX650 - Sony TV Service Manual (repair manual). Page 119

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KDL-26/32EX550, 32/40/46EX650(CH)
119
3-8. TV COMMANDER BUTTONS MALFUNCTION
TROUBLE SHOOTING
1) TV button malfunction
Button malfunction
on the TV
Replace the Harness
between B* Board and
Switch Unit
Switch Unit
Harness
Switch Unit change
B* Board
NG
NG
Symptom 
improvement
Symptom 
improvement
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