Backlight Test (CNM803 Removed)
Pin
Item
Volts
Pin
Item
Volts
11
1F2
NC
12
1F1
NC
9
1-
NC
10
2-
NC
7
1-
96Vdc
8
2-
1Vdc
5
NC
NC
6
NC
NC
3
1+
192Vdc
4
2+
190Vdc
1
1+
NC
2
2+
NC
[55" Panel Pin Map]
CNL802
(12Pin)
1.
Activate Backlight. (Remove
CNM803
)
2.
Check 192Vdc Supply Voltage at (pins 3 ) and at CH1 on SMPS.
3.
If Missing remove
CNL802
and test CH1 again.
→
If still missing replace SMPS, If OK (high approx 280Vdc) replace Panel.
4.
Check pin map voltages. If 192Vdc is OK but other voltage(s) missing,
→
Replace Panel.
4-18
4. Troubleshooting