Went to fix this Lg like some of the other 50 and 55 i have repaired. Couldnt get all the lights to test out light , seemed like they were shorted open. When the tv standby light changes to turn on the backlight does not flash or anything. I ordered a whole new set of lights from shop j and installed and still the same thing. i have three of these power supplys but none seem to turn backlight on. I can start at first light strand and jump positive and negative and it will light, i do the same thing on next and it will light but weaker, by the end of the strand it doesnt matter if i jump it or not it doesnt have enough voltage to light. How much voltage to backlight should i have and what boost it and tells it to turn on. the voltage i see is present even with the tv off and its not very much.
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Re: Lg 55ln5400
Hard to help without your pictures for us to see exactly what we are dealing with.
What kind of the Voltage measurement did you do for the supply voltages and control signal Voltages?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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The flood light over my garage was hanging out of the house due to the previous moron not knowing how to anchor it correctly. So I fixed that today
I then go to turn the light on tonight, and it doesn't stay on. If I tap it with a piece of wood, the lights come on for a sec them dim. Repeated tapping will cause it to eventually start working, until the switch is flipped, then it's a 50/50 shot it will work again or need to be tapped to start
So tomm begins the diagnosis. What do you think it is? Vote now!
A: A loose connection in a wire nut. I tugged... -
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