跳转到主内容

修复你的物品

维修的权力

商店

Repair guides and support for your LG TV.

926 个问题 查看全部

LG TV - powers on, but black screen after LG logo, backlight is on

Block Image

Block Image

Block Image

Block Image

Block Image

Hi guys,

A few days ago my TV screen suddenly went black and I don't quite know what to do.

Basically, if I turn it on the LG logo will appear for about a second or so and then the screen goes black. although backlight stays on. The only button on the remote that does anything is the on/off one.

Called up 2 tv repair shops and both told me almost straight away that it sounds like the panel is dead and I need to basically replace the whole screen (a $3,000 repair), which I don't quite believe.

When I took the TV off the wall and tried turning it on again a few days later - it worked fine for maybe 10 seconds and then the screen went black again.

Maybe there is a loose connection somewhere or something.

Any ideas? I hope there's something I could try before I throw it away.

The model is LG 70" UH635T, I could find it in the list so had to choose a random LG model when posting this question

Thanks!

已回答! View the answer 我也有这个问题

这是一个好问题吗?

得分 4

评论:

My LG 55 TV turn on, show the LG symbol for 2-3 seconds then goes to black screen/shut downs. Anyone know if this is the power supply or main board. I have sound through the surround sound but not TV.

完成的

Stan what was the solution? did you manage to fix your TV? I am having the same problem

完成的

Mine just went too!….The same %#*@ problem!!!

完成的

Mine went out too. Haven't found a solutions

完成的

Hi guys,

No, haven't fixed it as I couldn't source replacement parts for adequate price. The TV is just sitting in my garage at the moment.

完成的

显示更多的11条评论

添加一条评论

9个回答

已选择的解决方案

@crashxxx backlight on without video is usually a main board problem you did not tell us if you get any sound. You need to check out all your video inputs and see if that changes anything. If it does not remove the back of the beast and take a look at all the boards for any obvious damage (leaking or domed looking caps etc.). Post pictures of your boards so we can see what you see. Use this guide 在已经存在的问题里加入图片 for that. The problem could be the panel but it could also be the power board or the main board.

这个答案有帮助吗?

得分 2

评论:

Hi There,

Took the back cover off and uploaded the images of all 3 boards.

Turned the TV on after a month or so and it worked again for about 10 min. and then the same issue. I noticed a few more things:

- There is a green LED LD701 on the power board that starts blinking when the screen goes black (blinks 5 times)

- The red standby light blinks 3 times when I I turn the TV on and before backlight turns on

I was thinking of trying replacing all 3 boards (starting with the power board) to see if it fixes anything. Sounds like a better option than buying a new tv... not sure if I should really start with the power board though.

Thanks for your help!

完成的

@crashxxx does the sound remain when the image turns black? this sounds more like a main board issue than a power board issue.

完成的

I was playing a movie via USB stick. As soon as the screen goes black - there is no sound. Basically the only thing that is on is the backlight. It is also weird that if I don't touch the TV for a week - it will turn on again and work fine for another 10min or so. I also realised that there was a thunderstorm when the TV died and on the same day my power board died (unfortunately, the tv was connected directly into the wall socket so there was no surge protection). Not sure if this info is useful. It feels like there is some sort of protection mechanism that kicks in and shuts the TV down.

完成的

@crashxxx all of this "no sound. Basically the only thing that is on is the backlight." and" It is also weird that if I don't touch the TV for a week - it will turn on again and work fine for another 10min or so" sounds like a bad component on the main board. It comes on for awhile until possibly the failed component heats up enough to quit working. That'll be the green board in your pictures. Remove the EMI shield and lets see what is going on under there.

完成的

Hi.. Did you fix your tv finally?

完成的

显示更多的8条评论

添加一条评论

Had same problem with a LG 5510

Was watching TV and screen just faded to black sound remains

Logo comes on upper left for few second's then fades to black

Disconnected everything gave the back a good vacuum noted was dusty near some of the ventilation slots

Screen came back on after restart only been 10 mins but colour contrast vibrant looks good

这个答案有帮助吗?

得分 1

评论:

So perhaps in my case was dust over power supply area??

完成的

Mine did not have sound. Mine just died last eve, and each time I tried to restart it, I saw the LG logo, and my HDMI input info, and then it faded to black w/in 2-3 seconds. Unplugged, vacuumed, and dusted the ports, and then restarted. It did the trick! The set rebooted and ... Voila! Good to go!

完成的

添加一条评论

Hold down power button on bottom of tv for 10 seconds when it’s on.

这个答案有帮助吗?

得分 1

评论:

You are the bomb! This worked. Saved me a ton of $$$ and stress.

完成的

Wow!!! Dude...I literally just did the same think (except with the remote) and it worked!!! What in the heck???? why? what was it can you elaborate??? but thank you soooooo much!!!

完成的

添加一条评论

Hello its either the backlight or the inverter circuit that lights the backlight usually on the power supply. Try to change the power supply before dealing with the lights.

这个答案有帮助吗?

得分 0

评论:

Did you not read the part that says the backlight is still on your thinking of the issue where it's just the backlight that dies and make the screen dark our issue even if you put a flashlight to the screen you cant see the picture you can visibly see the backlight lighting up a black screen

完成的

添加一条评论

Ran into the same situation. What we did was follow the 8 or so recommendations before you have to open up the TV. What we also tried was, Go into settings and turn “off” the back light. It worked. Then since then I’ve turned it on incrementally. First at 10%, then after a few hrs to 15%. Still working, after 1 day. We don’t really want to spend anything on this unit if we have to. So far so good.

这个答案有帮助吗?

得分 0
添加一条评论

Hello! I have the same problem… for years now. I have the LG 49UH6100. I got it since 2017. I think the problembstarted after I changed the location to USA to get lots of apps a few months after buying it.

So every few days, the problem appears. You turn it on ang LG logo appears and then it’s just black with the backlight on. If you hit HOME, it would say its still starting up. Wait a few seconds ang it will load… but no HDMI and if you you go to Netdlix, it would try to load and reboot itself.

Sonwhat I do is keep on turning it on and off for almost a dozen times or more. Until it finally turns on to HDMI. And itbwill now work for a few days with no problems. Then the cycle repeats.

Its been like tbis for more than 2 years now.

这个答案有帮助吗?

得分 0
添加一条评论

I've been stressing about this. My tv would go dark only if the picture was dark or tv seen was at night so I would crop the picture and have a steady on background on the section that would go dark.

The other strange thing is that in initial setup mode the TV would stay on with perfect picture forever, but when done it would go dark again blank u can see picture only by shining a torch onto the screen and also barley.

But for the past week my picture has returned I no longer have to crop the screen everything is as it should be.

The issue was power, we unplugged alot electronics changed the multiplug and immediately saw a difference, check power supply to the socket as well

这个答案有帮助吗?

得分 0
添加一条评论

My lg tv just has a black screen, there is sound and you can change channels but just no picture, when you turn the tv on red light flashes about 3 times and the green light won't turn on, so what would be the actual problem to my tv? I bought the tv last year Model Number # 49UK6200PUA; Serial Number # 811MXGLPW367

这个答案有帮助吗?

得分 0

评论:

Hi,

How old is the Tv?

If it is less than 12 months old and you bought it from new, check the warranty statement that came with the TV or perhaps it is in the user guide that came with the TV as to what to do to make a claim for a manufacturer's warranty repair or replacement

完成的

Hi I have a 50 kg smart tv it only has a power button no channel button or volume and no remote and the tv turns on shows the lg symbol and then goes to an off black/blue screen I've tried to hook up my blueray to it it goes on to the hdmi but doesn't show anything any suggestions

完成的

It's a LG 55uk6090pua

完成的

@B_L_A_C_Kout 420 ,

How do you change channels or adjust volume etc, without a remote?

The LG logo showing means that mostly the hardware is OK, i.e. the power and the screen and the connection between the mainboard and the screen. The logo comes from the mainboard eeprom chip whereas all the other signal information uses the digital signalling video/audio processing chip(s) on the mainboard,so it appears to be a mainboard problem.

Try a power refresh just in case it is corrupted firmware, it doesn't take long to do.

Turn off the TV, remove the TV power cord from the wall outlet (or powerstrip) and then press and hold the TV power button for 30 seconds and then release the power button.

Reconnect the power cord to the wall outlet and turn on the TV and check what happens.

How old is the TV? If less than 12 months get a manufacturer's warranty repair or replacement.

完成的

Hi I will try that

When it cold it will shows the lg symbol but when it gets warm it shows that it's on the component input and when I hook up the hdmi it dosent change to hdmi it stays on component input and it multiplied half way down the screen I'm thinking video card

完成的

添加一条评论

It’s a problem with the motherboard.

solution may sound extreme but it works.

Remove board and place in Warm oven for 20 minutes. Allow to cool , reinstall and all should be good.

这个答案有帮助吗?

得分 0

评论:

not helpful. I managed to squeeze my 16 inch telly into the oven and set the heat to 180 degrees, but this resulted in the plastic melting around the edges. perhaps 180degrees is too hot? tv still doesn't work. sad face

完成的

I’m sorry to say that you must have misunderstood the instructions on how to do this procedure. You ARE NOT TO PLACE THE ENTIRE TELLY INTO THE OVEN FOR GODS SAKE MAN! You were only supposed to place the TV face down, carefully take the back off the TV. Unclip and remove clips off of the motherboard which is a square computer board that has soldering on it that needs re melted. You probably need a new Telly now.

完成的

添加一条评论

添加你的答案

Stan 将永远感激不已
浏览统计数据:

过去的24小时: 219

过去的7天: 1,397

过去的30天: 6,593

总计 112,415