LG 47LN5750 No picture

The voltage is near zero on both sizes (although I don't have a tester with Min/Max setting). Just wondering if the 100V is continuous and I need one with the min/max setting? Also would I be able to use a 12V battery charger to check if the LEDs are burnt out? The voltage is near zero on both sizes (although I don't have a tester with Min/Max setting). Just wondering if the 100V is continuous and I need one with the min/max setting? Also would I be able to use a 12V battery charger to check if the LEDs are burnt out?

You don't need a meter with the min max setting, that voltage should be there at all time. The voltage will vary depending on the amount of LED's in the panel...some sets run as low as 60 and some get up to over 150 but if you have nothing with the plug unhooked you have a bad power supply board, depending on how much experience you have in electronics the LED light circuit on the power board isn't that hard to service and usually can be fixed for a couple bucks You don't need a meter with the min max setting, that voltage should be there at all time. The voltage will vary depending on the amount of LED's in the panel...some sets run as low as 60 and some get up to over 150 but if you have nothing with the plug unhooked you have a bad power supply board, depending on how much experience you have in electronics the LED light circuit on the power board isn't that hard to service and usually can be fixed for a couple bucks

There is still a possibility the board was damaged by shorted LED lamps and a new power board won't solve your issue There is still a possibility the board was damaged by shorted LED lamps and a new power board won't solve your issue

Thanks Larry - I'm not sure what you mean by servicing the LED light circuit. Since I installed a new Power Supply is the next step to find a burnt out LED strip(s) Thanks Larry - I'm not sure what you mean by servicing the LED light circuit. Since I installed a new Power Supply is the next step to find a burnt out LED strip(s)

There is no doubt you have some open LED lamps inside the panel, the lamps are all wired in series like the old Christmas lights used to be, if one goes out the entire string is out. I did look at the service bulletins on this set and its prone for lamp failure. You can order new strips from shopjimmy but they aren't real cheap and a pain to change There is no doubt you have some open LED lamps inside the panel, the lamps are all wired in series like the old Christmas lights used to be, if one goes out the entire string is out. I did look at the service bulletins on this set and its prone for lamp failure. You can order new strips from shopjimmy but they aren't real cheap and a pain to change

That's what I thought - thanks for your help - I'll give it a shot - learning exercise - I know there are 12 strips - what's the chance that's it's just one strip? - Probably easier just to order all 12 eh? That's what I thought - thanks for your help - I'll give it a shot - learning exercise - I know there are 12 strips - what's the chance that's it's just one strip? - Probably easier just to order all 12 eh?

The problem with LED sets is the lamps in the panel are basically a 2.5 to 2.8 volt lamp depending on what bulb is used but they are driving them at around 3.3 to 3.5 volts with the backlight setting at 100 and that is the factory setting, this is just my opinion but I think the engineers set the backlight setting at 100% intentionally to reduce the life of the lamps making the sets only last a couple yrs on avg. Ive got 4 LED TVs that are all several years old and not a one has given me issues but I reduced the setting to 75% when I bought them. I'm seeing about half the sets that come in for service that are over 2 yrs old having backlight failure, its kind of sad. I do reduce the setting to around 80% on the sets I work, not sure how much that will help since they have been running at full brightness for the age of the set but figure its going to help some. The problem with LED sets is the lamps in the panel are basically a 2.5 to 2.8 volt lamp depending on what bulb is used but they are driving them at around 3.3 to 3.5 volts with the backlight setting at 100 and that is the factory setting, this is just my opinion but I think the engineers set the backlight setting at 100% intentionally to reduce the life of the lamps making the sets only last a couple yrs on avg. Ive got 4 LED TVs that are all several years old and not a one has given me issues but I reduced the setting to 75% when I bought them. I'm seeing about half the sets that come in for service that are over 2 yrs old having backlight failure, its kind of sad. I do reduce the setting to around 80% on the sets I work, not sure how much that will help since they have been running at full brightness for the age of the set but figure its going to help some.

You can resell your power board and T-con on ebay if you want to get at lest part of your money back instead of throwing it away with the set. You can resell your power board and T-con on ebay if you want to get at lest part of your money back instead of throwing it away with the set.

Great - I've just stripped it down to get the part numbers from the strips - if I get it working I'll take your suggestion on the settings. The youtube video was great. I don't have a way to test the strips so I'll just order the set. Great - I've just stripped it down to get the part numbers from the strips - if I get it working I'll take your suggestion on the settings. The youtube video was great. I don't have a way to test the strips so I'll just order the set.

Its best to order the entire set anyway, be really careful when removing the panel as the thin flat connectors that go to the tcon board can be damaged really easily and chances are you won't know they were damaged tell you put the set back together and find a part of the picture missing or distorted, also the various layers of film all need to go back in the order they were removed or it won't work right. Its best to order the entire set anyway, be really careful when removing the panel as the thin flat connectors that go to the tcon board can be damaged really easily and chances are you won't know they were damaged tell you put the set back together and find a part of the picture missing or distorted, also the various layers of film all need to go back in the order they were removed or it won't work right.

Got it - parts ordered - good news that if it doesn't work I get a better larger TV. Just couldn't see tossing out a 3 year old TV without trying. Appreciate your advice - thanks again. Got it - parts ordered - good news that if it doesn't work I get a better larger TV. Just couldn't see tossing out a 3 year old TV without trying. Appreciate your advice - thanks again.

Your welcome!...good luck Your welcome!...good luck

Well Larry - installed the LED strips and didn't solve the problem. Still see image with flashlight. Now to sell all the parts I purchased (LED strips, T-Con and Power Supply) unless you have another suggestion? Good for parts now but it was interesting to see how things are put together and how cheap parts are for TV's. I'll make sure I turn down the backlights to 75 or 80% on my next TV. Cheers Well Larry - installed the LED strips and didn't solve the problem. Still see image with flashlight. Now to sell all the parts I purchased (LED strips, T-Con and Power Supply) unless you have another suggestion? Good for parts now but it was interesting to see how things are put together and how cheap parts are for TV's. I'll make sure I turn down the backlights to 75 or 80% on my next TV. Cheers