The sound is working but The screen is black.

Try disabling Fast TV Start in the Power section of the Sytem section in Settings. Worked for me.

Thanks, Ron! I specifically remember enabling the Fast TV Start feature when I set this TV up for my dad. I didn't think about trying to disable that during our troubleshooting. I appreciate your input!

we had to unplug both the tv and the cable box, wait 30 seconds, reconnect and then power on using the roku remote; then all was working. !!!

thanks to caroline and ron for your combined tips.

@ceevee35 Glad u experienced the same results as I did. Unfortunately you have to wait much longer for the TV to connect to the internet if u r running it wireless as I. I also have the Roku external speakers (great sound improvement for $150) which take time to connect prior to the wireless internet connection completion. The time to fully be ready upon power-on takes my set about 1.5min. .....better than throwing out the set. It seems to me that TCL or Roku introduced some software/firmware bugs in an update recently. Best of luck to Ron

Thanks Ron, I did exactly what you said. Realized I was already disabled from that feature then I saw system reset on that list and pushed it and now it works. Thanks

I have the same TV and similar to your problem.

Did you try the reset using a series of keystrokes on the remote?

Look on YouTube for how to do that. Just search your model on how to reset.

On mine I have a black screen but I can see it's fully lit up. All the LEDs are lighted. But no images.

I can hear the clicking of the remote as chick the various buttons. So I would assume it's just a single board that needs to be replaced. And I'm quite capable of replacing the board but don't care to spend the money unless I know for sure that's the problem.

I've asked on the forum here, but sadly not one person had replied.

So don't be surprised if you get no replies either . Good luck hope you find a solution.

awesome fix, worked as a charm, did go to settings afterward and turned off quick start, I knew when I bought this set that it was cheap and expected it to not last, we will see if with this fix i'll get some more time out of it

Good sir. May you offer your source of part(s) and or YT vid?

https://youtu.be/I32MBlbRWMs - video to show LED strip repairs. Each tv version of my model (55S40x) differs slightly on the breakdown.

The parts came from eBay. I had never used seller https://www.ebay.com/itm/TCL-55S405-55S4... . Just search your tv model & 'LED Strips replacement'. Costs go from ~$25 - $50. I spent a couple extra bucks & picked somebody east coast to get it faster.

Forgot to mention; the YouTube video guy tries to repair his LED strips. I don't know how to read electronic scopes or repair circuitry, so I went with the $32 replacement parts.

Mark-- I think I also saw your comment on the YT video you linked. Same model TV, mine also 2.5 yrs old like yours...I can see the menu/letters with flashlight test. I've tried LITERALLY everything else mentioned here and elsewhere online. Going to attempt to swap out the LED Strips. Questions...1. Did you simply replace ALL strips rather than search for the one faulty LED bulb?? 2. Could you please list ALL tools you needed? 3. Did you use the little plungers to lift the glass or can this be done easily with two people? 4. Any snafus or anything you think I should know before attempting this that you wish you had known? Sorry for all the questions but I'm not super handy or mechanically/electronically inclined so a bit hesitant. Thanks for your time and appreciate all of the posts and links.

I replaced all of the strips. At startup I could see the Roku launch screen just fine for a half second, then black. It has a built-in protection that shuts the LEDs off if it senses problems. I only used screwdrivers. I didn't buy the plungers. Someone helped me move it. If the panel cracks, the tv is trash. I didn't buy the replacement LEDs until I knew I could get it out. The panel sits in plastic tracks that, sort of, click into the metal chassis. Either the top or bottom {think was top) of the LCD had this piece glued in on mine. Other 3 came up/out with, slow prying. Be careful disconnecting & reconnecting cables. I had to go back into my tv to reconnect the LCD ribbons - I had no pic but brightness the 1st time I finished. Go slow and don't pull too hard on anything; except maybe the feet posts. I had to wiggle mine back & forth to get out. Make sure to give connectors a little tug after you reconnect them.

Hi everyone, we have a Samsung 50 " TV that has been doing the same thing for months.

We have comcast and they have been out 8 times and replaced all the boxes, wiring and so on.

We have a electrical strip with everything plugged into the strip including a lamp.

The lamp light was always on so no problem right, wrong, we replaced the electrical strip and the problem was solved.

So you might want to check your electrical strip if you have one.

Good luck

Throw the tv away before you open the box, you'll feel better than all the people who watched it die a slow death.

Hey, I am also having the same issue, I tried shining the light in a darkened room and can see shape silhouettes. How do I know whether its the LCD strips or the power board

@John Ng'ang'a ,

If you have a TCL TV there's not much information on them out there.

You may have to find out where the power is coming from for the LED strips, the power board or the mainboard, by finding the cable coming from the panel. There won't be too many wires in it (4?).

Then measure the voltage at a suitable connection point. If it is high voltage (>220V DC) it most probably is in the LED strips. if low voltage (<50V DC) the source of the supply or the mainboard not telling the supply to turn on the power.

Sorry about the vague answer but as a DIY repair, testing the power board and the power to the LED strips is the only way to move forward on this

@jayeff

you have been extremely helpful. far more helpful than roku or tcl care to be. I’m working on a tv right now with this issue. Just replaced the power supply and still have the issue. Going to reset but doubt it’ll help. With your advice, I will probably have to replace LEDs.

Same issue, only we were blessed (?) to have our TCL 55" work for two years and 6 weeks. Black screen. None of the resets worked for us, and I am sad to say that we also have a TCL 65". Blah. I will file with BBB just because I see there are no viable options and they do not take any responsibility for making a bad product. It's sad. But . . . at least we all know not to buy TCL ever again! Right?

Same issue with a 55". I have tried all suggestions. My solution was to disconnect everything remove from mount and dispose of. Never buy a TLC again. Mine lasted less than 2 years.