Chosen Solution

My TCL tv keeps flashing black on and off. It’s not a complete solid black, kinda transparent on the left side and transitions to solid on the right. It’s happened a few times and eventually fixed itself bit has now happened again. Sound is unaffected. Can’t be the hdmi as it happens even when no cord is plugged in and the no signal screen comes up. Power supply is plugged into a surge protector. Any thoughts?

@tracywoods82 sounds like a backlight issue. You do want to check the power supply board on this. Remove the back of your TV and take a look for any obvious damage. Leaking or domed looking capacitors as well as all the interconnect wiring are a prime suspect. Double check all that. Post some images of your boards etc. with your question. That way we can see what you see. Use this guide Adding images to an existing question for that.

Change the picture settings. I set everything back to normal and the flickering screen issues went away.

Same/similar problem TCL 49D100BAA (1080p no roku/no wifi) Tv hdmi(arc input) to rhe soundbar powerd woofer amplifier hdmi distribution (1 in hdmi from computer, 1 out hdmi to Tv) . Tv started slowly flashing dim to bright over ~5 min the rate went from 20x/min ro 60+/min. The solution working for me/my set uo so far. 1.Turned off tv, unplug hdmi and power cord. Push power button when unplugged, wait few min(i did 5 not ina hurry). 2. Plug just power cord back in Turn TV on goto Tv menu and factory reset (i restarted Tv again probably unnec) 3.. After restart the following settings worked(Bright:50 ; Contrast:55; Hue:55; Sharp:50; temp :normal; Dynamic Contrast:Off; screen ratio:Point ro Point; NR:Off. Backlight:50. 4. All cables checked and/or (re) connected to computer. So far sink remains open, no other problems.. Yet.

Mine has been doing the same thing. Sometimes on the left, sometimes on the right. It works in conjunction to the screen TVbrightness/PictureMode. If I set to Normal/Normal, all is ok. If I raise either 1 of the 2 settings to a brighter screen, such as bright or vivid or enhanced, I get the flicker. Also, changing the backlight level higher will cause it as well. Annoying, but will put up with if for a while, until it gets worse or goes out.

If I have to replace it, will go back with the same TV I guess. TCL Roku 55” 4K.

Unfortunately….the TV Screen is bad. The LEDs are at fault.. It is nearly impossible to remove screen cover to replace the LEDs in any TV. When under warranty…we will receive a new panel (screen, once called the picture tube) and replace. Take boards out of bad TV and install into new panel. A new panel is as much as the TV $. I have seen many TVs with this problem, and is common to all sets now. Thanks for asking, Matt of Martins TV Repair. Update (01/09/2019) I have repaired many of these. Unfortunately the LEDs are not operating correctly. It may be the LED board. But truly the LEDs are flickering because of a faulty LED. These units can have approxitimately 40 + LEDs. If one goes out….they all go. The only real poosible repair is to replace the entire panel (What you actually watch is the panel). You may have seen repair on line, replacing LED strips…that may be fine. This is very time consuming and can be a complete waste of time. Under warranty, ( year old or less) a new panel is sent. We remove the boards from your now TV, and place them into the new panel. I would consider shopping for a new set. Thanks for asking, Matt of Martins TV repair. Update (01/30/2019) Another thing you want to try, in TVs with this issue. LVDS cables may need cleaning. These are the TAPE (CABLE) RIBBON you see to and from power supply to main board. The other RIBBON CABLE to the T-con board or the TV its self. Unclip these carefully and slide out. With a can of electronic cleaner spray a chamois stick. Clean the contacts at the end of the RIBBON CABLE (TAPE), and then the board contact its self as well. Thanks for asking Matt of Martins TV Repair.

Yes, that can work. The real problem is that there are a few LED’s that are not coming on. By setting the picture mode to Movie or sometimes Game mode will correct the flashing. Picture is not totally bright, but you can enjoy your TV. Thank you for listening, Matt of Martin’s TV Repair.

Hi, I was just able to stop the blinking dark then light on the left side by going to picture settings and changing the setting from bright to dark.

We’ve had the same issue going on for months and I think I’ve finally fixed it, so thought I’d post here in case it helps others. I found a separate HDR settings menu that only appears when watching something 4K HDR. For us it was something in Netflix that I had paused. I happened to press the settings button on the remote while there and realised that everything was different. The backlight setting was at 100 instead of 65 that we had it at in the regular settings. I lowered the backlight until the flashing stopped. It got less frequent the lower the backlight number and stopped completely in the low 60s. I’m leaving it at 65 for now and will lower it more if needed. I hope this helps someone else! So glad we don’t have to buy a new TV when apart from the flickering this is perfectly fine.