CM803
CNL802 (to BLU)
1 NC 9 NC
2 3 + 10 1 +
3 3 - 11 1 -
4 NC 12 NC
5 NC 13 NC
6 2 + 14 NC
7 2 - 15 IF2
8 NC 16 IF1
230Vdc (panel size dependent)
BL Supply measured at diode Stripe
(cathode). This will raise to approx
280Vdc with an open string of LEDs.
CNL802
1
2 3 LED Strings 3
- + - + - +
Fixed Supply Control
LED
Pins
Min
B/L
Max
B/L
Full B/L
Test
Panel Con.
Removed
Sample
2- open
3- 130Vdc 95Vdc 88Vdc 0 0
3+ 174Vdc 151Vdc 144Vdc 0 0
2- 174Vdc 151Vdc 144Vdc 0 Opened
2+ 218Vdc 207Vdc 200Vdc 0 257Vdc
1- 218Vdc 207Vdc 200Vdc 0 257Vdc
1+ 241Vdc 235Vdc 230Vdc 275Vdc 279Vdc
Simplified BACKLIGHTS Test
1. Activate Backlights – Disconnect Lead
Cable from Main to Power Supply.
2. Measure BL Supply voltage at 1+ or at
the supply diode cathode (stripe).
3. Remove Panel connector and
measure again to compare.
4. If voltage is high and stays the same
high reading a string of Panel LEDs are open.
Replace the Panel.
If the voltage is low and remains low the
SMPS is defective.
Wired at SMPS in Series. If one LED string goes out all are out, no backlight.
UN40J5500FXZA SMPS: Backlight (wired in series)
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