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PHILIPS 715G6973-P03, voltage drops slowly to 0V on board to backlight

Hello everyone

I am currently working on a television where the backlight gets dim over time. After mesuring the voltage on the connector to the backlight I see that the voltage starts at a normal voltage and drops to 0V slowly. Wich component could cause this malfunction? Thanks in advance. 

mosomedve picture

This type power supply has four backlight circuit. If any backlight LED bar is defect the backlight controller processor switch off the the backlight supply circuit. If you have LED tester please check which LEE bar circuit is defect.


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