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4. Troubleshooting
BACKLIGHTS
„
1.
Activate Backlights Test
Disconnect Lead Cable from Main Board to Power Supply. (CN202)
-
TV Screen for active backlight LEDs.
9
2.
If NO BACKLIGHTS
Plus (+) & Minus (-) pin voltages on the Panel Connector.
9
If no pin voltages replace SMPS.
-
If voltages exist but no backlight:
-
The highest pin voltage (BL Drive Supply )
9
Remove Panel connector and measure again to compare.
-
If the voltage was high and stays the same high reading a string of Panel LEDs are open. Replace the Panel.
-
If the v
oltage was low and remains low the
-
If the voltage was low and goes high a string of panel LEDs are shorted replace the
-
For BACKLIGHT DIMMING PROBLEMS:
•
Go to
Menu → Picture → Backlight and vary level (0 – 20)
•
If no backlight changes observed:
Panel Connector pin voltages and BLU_PWM voltages (CNM801) while changing backlight level.
9
•
If Panel voltages don't change, and BLU_PWM changes, replace
•
If BLU_PWM doesn't change replace
4-6
:
SMPS
Main/T-Con Board.
is defective.
SMPS.
Panel.
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