4-1-4. SMPS Backlight
Backlight Test (CNM803 Removed)
CH1
192Vdc
P Item
Volts
P 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>
96Vdc
192Vdc
1Vdc
96Vdc
Backlight Test
Activate Backlight (Remove CN803).
1.
Check 192Vdc Supply Voltage at Pin 3 and at CH1 on SMPS.
2.
If Missing remove
3.
CNL802
and test CH1 again. If still missing replace SMPS, If OK (high approx 280Vdc) replace
Panel
.
Check pin map voltages. If 192Vdc is OK but other voltage(s) missing, replace
4.
Panel
.
4-4
4. Troubleshooting