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LG TV 65UJ651V keeps restarting

Hello,

since two weeks ago, our TV (28months old) stated to reboot itself for no reason. It was getting more frequent, so today we have decided to do factory reset. Once the TV turned on for initial set up, on the scree where you have to confirm language and location, the TV turns off. And thats it. I can not do anything else, except this endless loop. I was trying to upgrade SW, however the TV doesn’t recognise the USB while in initial setup. Also I tried all unplug/10/30 seconds power button, changing batteries in remote. Nothing helps.

Any idea?

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I have an LG doing the same thing as well. Any fix?

da

Lol samething happening on my tv. Is there anyone else or anyone know any solution?

da

@tips tricks what make and model is your TV and what exactly is it doing?

da

Yes, Here is the solution. I consulted various forums and tried everything.

My TV 65 4K CURVED 3D, 65UG870T restarts for no reason, does endless LG logo loop. Following are the steps I tried.

1.Pulling out the power cord for 30 secs and plugging back in.

2.Factory reset

3. Disabling HDMI CEC/simplink.

4.disconnecting all the cables, fire cube,xbox,ps4 etc. (I used Fire cube gen1, xbox one s, ps4 pro and samsung q70r sound bar)

I was almost certain that its a hardware problem.

Finally one day, on my own, I changed the firecube output to 1080p 60hz only and voila it worked !!!!!!!!!

Good luck guys

da

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The easiest fix is to unplug TV, press the power button 50 or more times. (I did 100 after a cross-country move), plug the TV back in and you should be good to go. This worked on two different TVs, both of which had heavy static buildup after our cross-country move.

This is a well-known issue with desktop PCs that has worked for me for decades when they experience boot loops.

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Update: I had to bring the TV to official LG repair shop. They had to replace power supply circuit and something else (don’t remember). The TV is now working normally. Costs: 225€.

da

Thank you for your suggestion☺️ this method really help me as I facing this issue in my tv . Saved repair cost

da

I can not believe this worked thank you

da

I'm absolutely floored this worked. I thought I was out a TV. Thank you so much!

da

It only works for a couple of weeks and then you have to do it all again! This was not acceptable to me and LG replaced the motherboard and power supply. After six hours the same problem occurred. This is a LG problem with their firmware that they are aware of and refuse to fix,

da

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@bluephantas in general these start and restarts etc. are commonly caused by failed MOSFETS on the main board. Of course we need more details as outlined above from you to be more precise

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I am happy to provide more details if that could help anyhow. I have also contacted local LG customer support by mail to see if they could helps. I don’t think as it is out of warranty, but I have to try also the official channel as 2 year TV should be working normally.

da

@bluephantas what happens as it turns off? Does the power LED turn off as well? Can you immediately restart it? Have you tried all other input sources? Does it turn off or is it only the screen that turns black? Disconnect all of your inputs (cable box, sound bar etc.) and unplug the set. Hold the power button down for a minute and then connect one input source. Preferably something local like DVD, BR, Game console etc. and see if your TV now starts and stays on. If not then it is time to take a look at the boards on the inside.

da

@oldturkey03 When it turns off, it restart itself. The LED turn on (as usual when off) and then back off when the TV is on again. It does restart itself. Inputs do not have any influence on this. It does the same thing when connected or disconnected. I've tried to start the TV thru HDMI device (playstation, chromecast) as it used to turn on in past when such device goes on. But no luck.

da

@bluephantas it is the main board tha tell the power board to supply the voltages for the TV to turn on. Your situation sounds very much like a bad main board. Take a look at that one and see if we can find anything.

da

Update of today. After trying all possibilities with buttons, pulling out the power cord, etc. etc. I have tried again pulling out power cord for longer period (3 hours) and then the TV started. So far so good. I am waiting for first restart as it used to before. Crossed fingers.

da

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My issue sounds similar. So get this. I have a 5 year old LG 55ga7900. My family was watching TV and it kept boot cycling. Shows LG logo, goes into find which display to use, off and back on again, over and over and never stops. Never-ending boot cycle. Replaced the power cable first, no lick. Get this, if I hold down either the power button on the TV OR remote, it doesn't boot cycle! The TV will stay on and work properly with one depressed and won't do the boot cycle. I could technically tape the power button down and have no problems. I went inside the TV and disconnected the button panel, thinking it was the internals of the power button shorting out. Took batteries out of remote. Same thing. It will boot cycle with the internal power button disconnected and the batteries put of the remote. I took the power delivery board out, checked all capacitors with a multimeter (I do pc repair for a living). Couldn't find anything blown on the power board. How in the heck does a boot loop go away if I hold either power button down and then boot cycle the moment I let go of the power button? I still think it must be something with the power board.

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btinsey it’s actually the main board that tells the power board to turn on. Check that. The power usually stays on by a couple of relays that are controlled by mosfets. This explanation is very simplified and there is more to it but that is in general how it works.

da

Have you figured out why it was? Our LG is doing the exact same thing

da

Mine does the same driving me round the bend

da

I just had the same problem for the past hour. I read in a different post to unplug it, hit the power button 100 times on the tv while unplugged and then to try it. To my surprise It worked and now I don’t have to replace a two year old 70 in tv.

da

@jake.wolfe98 I have the same problem too with my lg smart tv 65'. I will do the same and post results. thanks.

da

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This may be due to power supply issue. See this video for fixing the issue if you have a technical knowledge. Without a technical knowledge you can understand issue in some level. : https://www.youtube.com/watch?v=pB9quLQy...

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unplug the power cord from both ends ( the TV and wall outlet) wait for some time and plug it back. make sure that the power cord snugs firmly into the socket and gently tap the back of the TV ( close to the power inlet) twice. if this doesn't work, change the power supply chord.

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Yes this works but always starts back up again. Reset 5 times in a baseball game. The motherboard and power supply has been changed still resets. Is a software problem that LG refuses to fix. I want the TV replaced but have no confidence the next one will not be the same.

da

@Bob Kratz I wonder if your TV tried to connect to your network and is looking for access for some kind of update etc. Can you disable your TV from trying to access that?

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Patrik sarà eternamente grato.
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