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.
To Next Page
Loading...
