Toshiba 55L621U Black Screen After Splash Pops Up & Leaves

This was the problem: you turn the TV on and the splash screen (Toshiba Chromecast Logo) comes on and then goes black. The LED on the front right stays red.
I replaced the main board to no success.
I tried to install the newest firmware but it was unsuccessful. It's note worthy to say the attempt to reload the firmware confirmed the LEDs are not a problem.
I don't know what else to do.
Firmware update failure attached to the end of this video.

[@simpleman7727]

I do repair tv's and the fix for this particular problem is to replace the led strips. The illumination is divided in 3 sections and if one led is gone causing a section to be off, then the TV will detect the fault and enters into protection mode and will shut down. This particular model has 12 strips and they are are vertical and as you can see, the right 3rd of the screen looks slightly dark. A good indicator of that illumination sector gone bad. In other cases it could be in the center or the left side. There is a tutorial done by shoopjimmy on the whole disassemble procedure, strips removal and installation in case any of you feel comfortable repairing yourself. One thing I would advise is to ALWAYS replace all strips as there are good chances more of them are worn out and about to die.

[@mrbennotmrban]

That's true, I replaced the bad LEDs on a hisense and was aware that other leds will die sometimes soon, but do you think reducing the led current will give the rest of led longer life?

[@simpleman7727]

@@mrbennotmrban Yes. reducing the back light intensity will help to delay the failure of worn out LEDs.

[@Shiroe7246]

Primero debe hacer una comprobación electrónica para detectar el problema, luego puede decir si realmente hay que cambiar los focos

[@mrbennotmrban]

where i can get the firmware? tried toshiba website but not showing this model

[@Isaiahisnotonfire]

The same thing happened to me, did you ever figure out a solution? It just turns on & the logo then the black screen.

[@brad2157]

Looks light the right side backlights are out. That is probably causing the TV to go into shutdown as a result. ShopJimmy has a youtube video for this model and they replaced the far righthand side LED backlight strip. Seems to be a very common issue with this model.

[@aishaansari9576]

How about toshiba model 32L5995E ? Won’t turn on also the bottom red not turning green to on .. pls help me

[@davester32]

i have the 49L621U that had the identical problem. toshiba logo lit up fine, then it went black, with usual 5 flashes of the red led. i think the power supply is getting weak. i read other people saying the image is still there if you shine a flashlight and look really close, just the backlight is turning off. hit menu on the remote , fight your way into the picture settings, drop the backlight from 90 to like 10, drop brightness from 3 o like minus 2, hit ok (hard to do with screen so dim but focus). then turn it off and wait a minute, then turn it back on.

[@gaelleposenato9654]

Bonjour . Avez vous finalement trouvez la solution? Nous avons exactement le même model et le même problème . Merci

[@Universal_Learning_Co]

Anyone have a link to download the firmware?

[@alexanderwisdom]

Same thing just happened today. I think we need a class action suit against Toshiba.

[@jessesmith3365]

Sign me up twice🤣

[@jbrown3547]

Same thing to me today. Anyone get any fixes?

[@jklueny12]

@@jbrown3547 fix is to replace less, but it's a tedious process. I did this but broke the led screen. Looking to see if anyone wants to sell it for cheap for parts

[@Rooonster]

Happened to me too 🤦🏽‍♂️

[@jrtutube]

This happened to me too. I replaced three power supply and the motherboard. Still goes dark after the logo.

[@jamiemusial899]

Hey just letting you know all you have to do is change the back lights most likely two strips on the left have gone out very common thing with all tv's. it seems that the same lights go out on each of all different models the patterns are very different but consitent .....

[@nicktrueman2695]

Having a similar issue same model the display will come on for a bit after the splash then goes black with sound still on. TV is about 2 yrs old

[@tanakacheneka8092]

DD U manage to fix it?.my Toshiba smart tv powers ON to a blue screen , no images and the screen turns to dark blue . Any tips

[@jessesmith3365]

Unfortunetly no. Sorry

[@funcouple6082]

I've watched a bunch of videos and I'm pretty much convinced that the problem is the LED backlight. I just ordered a new set of LED strips from Aliexpress for $35. A set of 15. I have the Toshiba Chromecast 65" 65L621U that I bought in late 2016. I did not want to open up the TV to make doubly sure about which LED strips I need. The TV model matches the LED strips I bought and that's good enough for me. Opening it up and dealing with the huge 65" screen and not breaking it will be a chore, so I'd like to keep the 'operation window' as short as possible. I've watched a bunch of videos of people replacing the LED strips and it seems straightforward but also pretty hard. There is so much to take apart and it seems like so much can go wrong. I wish that the LEDs weren't buried under so many layers that you have to unscrew and keep track of. Seems like a real pain... suction cups to move the screen.... it's going to be a real production. Jeez.

[@victor1655]

they just changed the LED lights on mine and it now stays on, but just noticed that whenever i try and scan chanels it freezes and restarts. unless i interupt the scan and then all is ok but it doesnt bring up the complete list. ill call the repair place to see whats up.

[@Isaiahisnotonfire]

@@victor1655 what kind of repair place?

[@victor1655]

@@Isaiahisnotonfire its a local tv repair, it turns out the led strip wasnt the problem it was the psu. they switched it and problem solved. after they changed the led strip it only lasted like 2 weeks but they did give me 90 day warranty so i took it back there and they swapped the power supply and its been working great since then. it still struggles sometimes to catch a signal for the RF antena but i do live in an area with very poor reception.

[@sayedyousef9154]

توشيبا شاشه عظيمه انا جابت 55u59توشيبا طلعت ممتازه جدا جايبها من كارفور السيوف بالاسكندريه ب 7700جنيه وهي ممتازه جدا وتستحق اني ارشحها لكل الناس

[@jeremypierce8737]

I’m having same problem. I think it’s the power supply board. Did you ever get it fixed?

[@bridneyclark-diaz8129]

Mines doing the same thing bought new card it’s not it

[@Mista300c]

Same issue just happen guess it's time for a new tv😢 not worth getting repair

[@sahirahutson1612]

Do you still have this? I'd be interested in purchasing for parts if you're up for it.

[@jessesmith3365]

No sorry. I threw it away months ago

[@aishaansari9576]

@@jessesmith3365 how can I get that ? Same my tv problem.. pls advice me .. thanks

[@QuavoEnt]

I have 2

[@harryharrys]

Same with my tv

[@Emmanuelog05]

I am having the same problem when I turn on the tv, the speaker works fine. But nothing displays. After the splash, the only thing that shows is a bluish-black colour on the screen. Edit: I would like to know the cause of your problem, maybe it might help. Thank you

[@jessesmith3365]

Hey and thanks for the question. Unfortunately the cause is very uncertain. The tv was mounted on the wall for years before it just stopped working. It was on a surge protector also. No known reason

[@Emmanuelog05]

@@jessesmith3365 ok I just fixed my TV. And apparently it was a backlight problem and I'm not sure, but I want to assume for me though since in my country, power trips off alot, and I'm assuming that's the cause, but now it's working perfectly fine. Thank you for answering my question by the way

[@jessesmith3365]

@@Emmanuelog05 I'm so glad you got your fixed. Curious, were you able to get the boot menu loaded like I was?

[@Emmanuelog05]

@@jessesmith3365 Yes

[@geanfilipemoura7787]

@@Emmanuelog05 como você conseguiu consertar a sua ?

[@andrewlee88]

Same happens to mine. Started 4 months ago. Just picked up a Hisense after waiting

[@danielguzman951]

Right side is darker you can see that.

[@MrAsmith1583]

Just happened to mine a couple of days ago.

[@carladolphus9954]

Backlight out

[@sctantrums]

have same tv with same problem. happened after about 2 years

[@jaidenplays1]

It was a software update that brick it

[@jaidenplays1]

Are the ones you fix the 55L621u

[@ost4p]

Same issue. Tv lasted since 2018 November

[@jimfelter5941]

I have the same problem with my Toshiba TV

[@kxngcai9581]

damn so no fix?

[@jessesmith3365]

Sorry, but none that I could find.

[@danielguzman951]

Yeah looks like some l.e.d. lights are out when that happens it goes in a safety mode and shuts off there are videos on same t.v. on how to replace ones that are bad.

[@jessesmith3365]

I assumed since the update screen had full color with no dead LEDs and a full blue background that none of leds we're dead. Maybe I was wrong to assume that?

[@jklueny12]

I replace the light strips and it fixed the issue. Unfortunately I broke the screen though. If anyone doesn't want to deal with it, I will buy your TV so I can use the LED screen

[@danielguzman951]

Yeah your prob better off to buy new screen and use two suction cups to set in place or it's going to break aswell 😥

[@danielguzman951]

Usually the right side LEDs go out mine had two rows only one prob causing them to stay off.

[@jklueny12]

@@danielguzman951 I did use suction cups. Unfortunately I didn't put the screen in a good place and I bumped into it and broke it. Trying to scour the internet to find others who have this issue and try to pick up the TV just for screen now

[@magdalenabelmontes8001]

Where you able to fix it and if yes how?

[@jessesmith3365]

Unfortunately no. I tried replacing the main board to no avail. No go on trying to flash it and start over also. I went on red.it forums, tv websites and talked to tech supports. My TV was bricked by that mandatory upgrade

[@MrLivingIt1]

@@jessesmith3365 having the same issue when you say brick are we stuck with a paper clip????

[@jessesmith3365]

@@MrLivingIt1 Unfortunately yes, I threw mine in the dump

[@MrLivingIt1]

@@jessesmith3365 I'm not far behind you thanks bud

[@jamiemusial899]

Between models and brands ....this is common issue with this model specifically ....sorry hard to put in a short sentence ....

[@rafaelalmodovar954]

Just throw it away and buy a new one... I lost my controller and can't get to the menu to fix color settings that got stock in cool picture and colors are blueish 😒

[@AaronBowley]

mine just stopped working . piece of crap toshiba lol

[@carladolphus9954]

Two words...black lights..