Sony KDL-32R500C Service Manual page 87

3-11. TACT KEY
3-11-1. Switch Unit Buttons (Tuner)
Switch Unit NOT FUNCTIONING
Check Wire Harness
And Connector
Connection?
OK
** Check 3.3V
in Pin2, CN1
(Switch Unit)
OK
*Check
Pin 1 Voltage Level
in CN1 (switch unit)
OK
Change B-board
KDL-32R500C, 505C, 507C, 40/48R510C, 550C, 555C, 557C
NG
Change Wire Harness
And connect properly
**Check 3.3V in
(Pin 8, CN9702 on
NG
BE board) or (Pin
27, CN9700 in BA
board)
OK
NG
Change Switch Unit
NG
*VOLTAGE LEVEL FOR EACH PRESSED BUTTON
KEY Voltage (average)
- 0.000
+
1.114
CH/Input 1.693
No Input 2.420
**see the following slide for probing point at BA board and BE
board to check 3.3V, and probing point at switch unit
B* Board Type
Size
PAN ASIA,AMERICA EUROPE
32"
BA
40"
BA
TROUBLE SHOOTING
Voltage range
0.00 – 0.2
1.00 – 1.22
1.53 – 1.86
2.3 – 2.54
BE
BE
87 87