Table of Contents
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1.
Activate Backlights Test
TV Screen for active backlight LEDs.
9
2.
If
No BACKLIGHTS (Series Wired SMPS Panel Connection.)
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 (
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
voltage 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
BACK LIGHT DIMMING PROBLEMS:
•
Go to
Menu £ Picture £ Expert £ Backlight and vary level (0 – 20)
•
If no backlight changes are observed:
Panel Connector pin voltages and
9
•
If Panel voltages don't change, and BLU_PWM changes, replace
•
If
BLU_PWM doesn't change replace Main/T-Con Board.
: – Disconnect Lead Cable from Main to Power Supply. CN201
BL Drive Supply)
BLU_PWM voltages CNM803 while changing backlight level.
Panel.
SMPS.
4. Troubleshooting
4-11
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