Samsung LE40A676 dark picture

budm

Badcaps Legend

Join Date: Feb 2010

Posts: 40746

Country: USA
#41

09-04-2013, 03:05 PM

Re: Samsung LE40A676 dark picture

I never have any luck troubleshooting the SAMSUNG main board down to component level yet. So it sounds like the Pulse width never goes higher than 50% or even less, if is does have Analog dimming control pin, most SAMSUNG has both PWM and Analog dimming it just uses one or the other, you can disconnect the PWM pin and use the Analog dimming pin, 5v = Max brightness, so you can set it up with a trimpot to set the backlights brightness.

Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956

Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999

Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl

Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/

TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Samsung LE40A676 dark picture

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