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Backlight problem with tp.vst59s.pb813

hello,
what should be the output voltage for led driver in the board tp.vst59s.pb813.
the tv has 18 leds.
thank you.

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WESAM
WESAM picture

you have to know the operating voltage of one led (3 volt or 6 volt)  and then multiply by the number of leds used
for example if 3 volt led then 3*18=54 volt 
thanks
 

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