BACKLIGHTS
Activate Backlights Test1. :
Disconnect Lead Cable from Main Board to Power Supply. (CN202) -
TV Screen for active backlight LEDs. √
If NO BACKLIGHTS2.
Plus (+) & Minus (-) pin voltages on the Panel Connector. √
If no pin voltages replace - SMPS.
If voltages exist but no backlight: -
The highest pin voltage ( √ BL Drive Supply)
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 SMPS is defective.
If the voltage was low and goes high a string of panel LEDs are shorted replace the - Panel.
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. √
If Panel voltages don’t change, and BLU_PWM changes, replace • SMPS.
If BLU_PWM doesn’t change replace • Main/T-Con Board.
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