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Backlight Test
„
CNM803
3 Sets of LED Strings in series
LED Pins
Min B/L
3-
130 Vdc
3+
174 Vdc
2-
174 Vdc
2+
218 Vdc
1-
218 Vdc
1+
241 Vdc
1.
Activate Backlights Test
Disconnect Lead Cable from Main Board 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.
PANEL.
Replace the
9
If the Voltage is low and remains low the
<Series Strings of LEDs>
3
2
1
Max B/L
Full B/L Test
95 Vdc
88 Vdc
144 Vdc
151 Vdc
151 Vdc
144 Vdc
207 Vdc
200 Vdc
207 Vdc
200 Vdc
235 Vdc
230 Vdc
:
:
:
SMPS
230
BL Supply measure at diode Stripe(cathode).
This will raise to approx 280 Vdc with an open of
LEDs.
CNL802
Panel Con. Removed
0
0
0
0
0
275 Vdc
is defective.
Vdc(panel size dependent)
CNL802 (to BLU)
1
N.C
9
2
N.C
10
3
3+
11
4
N.C
12
5
N.C
13
6
2+
14
7
3-
15
8
N.C
16
Sample 2-open
0
0
Opened
257 Vdc
257 Vdc
276 Vdc
4. Troubleshooting
N.C
1+
1-
N.C
N.C
2+
IF2
IF1
4-11
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