Read Sony KDL-32R324D / KDL-40R354D / KLV-32R326D / KLV-40R356D Service Manual online
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3-9. Tact Key
3-9-1. Switch Unit Buttons
Check STBY 3.3V and 3.3V
(V=3.3V?)
at probe point
(see next slide)
when AC is ON?
Switch Unit NOT FUNCTIONING
OK
NG
End
Check tact key connectivity
using multimeter (see picture)
NG
Tact key NG,
change B board
Check
DDCON
OK
NG
Part faulty,
change respective resistor
OK
HOW TO CHECK TACT KEY
CONNECTIVITY
•Use multimeter to probe tact
key as below.
•When the tact key is pressed,
there should be a connection
(0 ohm)
Check resistance
during AC OFF.
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