I am trying to diagnose my mother and father in laws TV. The TV has a picture and is functioning properly other than the screen is very dim. If you are in a bright sunny room you can't see anything but if you are in a dark room you can see the picture but you can tell it's not right. I don't know if it's an LED probably, I have had other LG's that had nothing but problems with the LED's but when those had problems the screen would be completely black. Would love some help diagnosing so I can get this fixed for them. Thanks in advance!
LG 55UJ6300 Very Dim
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Re: LG 55UJ6300 Very Dim
Backlight issues are 99% the backlights themselves. On LGs, the protection circuitry usually kicks in to shut down the backlights but I have seen it a few times where it doesn't. https://techhometravel.com/lg-ln-ser...ed-backlights/ -
Re: LG 55UJ6300 Very Dim
Backlight issues are 99% the backlights themselves. On LGs, the protection circuitry usually kicks in to shut down the backlights but I have seen it a few times where it doesn't. https://techhometravel.com/lg-ln-ser...ed-backlights/Comment
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Re: LG 55UJ6300 Very Dim
My gut tells me it's the LED's since it seems to be so common with these LG's but I have never seen one still have some backlight and a picture like all the ones i have done have had no backlight or it would flash then go out.Comment
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Re: LG 55UJ6300 Very Dim
211 volts seems high, I suspect some of the led's in the panel are bad, there is less current being drawn so the voltage goes up.
Looking at shopjimmy, there are 10 strips with 4 led's on each, 40 x 3volt =120v total
It looks like the backlight control circuit is quite simple and keeps operating if a few leds are bad, not like some circuits that will shut down if even one led is weak.Last edited by R_J; 04-15-2022, 08:07 PM.Comment
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Re: LG 55UJ6300 Very Dim
211 volts seems high, I suspect some of the led's in the panel are bad, there is less current being drawn so the voltage goes up.
Looking at shopjimmy, there are 10 strips with 4 led's on each, 40 x 3volt =120v total
It looks like the backlight control circuit is quite simple and keeps operating if a few leds are bad, not like some circuits that will shut down if even one led is weak.
Ordered some LED's from shop Jimmy. Got the TV torn apart today and think I found the culprit as you can see in the photo. I will update once I get the parts and get it put back together.Comment
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Re: LG 55UJ6300 Very Dim
Yes , i can confirm i have repaired these sets before , 99% is the backlight , if you have some parts lying around and a 10Watt 33k-ish ohm resistor you can build a simple Backlight tester to save you the time of troubleshooting elsewhere.Comment
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Re: LG 55UJ6300 Very Dim
All strips were replaced with new ones from shop Jimmy. I just checked voltage and I am at 254 volts DC. I did not turn down the backlight or change anything just replaced the LED's and put it back together. Worked perfect for a day now no backlight at all.Comment
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Re: LG 55UJ6300 Very Dim
did you test the new leds before installing them? is that burnout in the exact same place as the original fault?Comment
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