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1
1+
2
7
4+
8
1
2+
2
7
1+
8
1.
Activate Backlights Test
TV Screen for active backlight LEDs.
9
2.
If No BACKLIGHTS
Minus (Control) pins & Plus (Supply) pins voltages on the Panel Connector. (
9
connector only for
•
If no pin voltages replace
3.
If BACKLIGHTS ON BUT PANEL SECTION(S) OFF
The Supply Drive (
9
•
If a Minus (-) pin measures low (near 0 volts), a string(s) of LEDs are likely open.
•
Replace Panel
•
If a
(+) pin measures low voltage and it's minus pin is low but not 0V.
•
Check for Defective
BACKLIGHT DIMMING PROBLEMS
•
Go to
Menu
Picture
£
•
If no backlight changes observed:
Panel Connector
9
level.
•
If
minus (-) pin voltages don't change, and PWM_BLU changes, replace SMPS.
•
If
PWM_BLU doesn't change replace Main/T-Con Board.
Use:
MUTE
4
1
9
£
£
£
CNL801 (LED Connector) - 40/43/50/55/58/65 inches
1-
3
4-
9
CNL801 (LED Connector) - 75 inches
2-
3
1-
9
: Disconnect Lead Cable from Main to Power Supply.
safety)
SMPS.
+) pins and (-) pins. All should measure same.
.
SMPS
Expert Settings
Backlight
£
£
CNL801 minus (-) pin voltages and PWM_BLU voltages CNM801 while changing backlight
EXIT
to test Panel Vertical Backlight Sections in normal operation mode.
£
2+
4
2-
N.C
10
N.C
3+
4
3-
5-
10
5+
and vary level (0 – 50)
4. Troubleshooting
5
3+
6
11
N.C
12
5
6+
6
11
4-
12
with fine test probe on left side of
3-
N.C
6-
4+
4-7
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