65 inch ONN Roku TV has no backlight just a Black screen.

[@balloney2175]

I highly appreciate your honesty by showing the replay. Cool video.

[@jstro-hobbytech]

Bigdawg playin a great game of fets

[@andreasbentz6106]

Hey man! Thanks for this video. I have a Toshiba here on my table with a similar issue. Take home value for me is the LED-strip tester. Just ordered one. If its not the LED strips but the driver, I will not go into such detail on troubleshooting, because the driver looks like an SMD graveyard and I found a power supply board on ebay. But its nice to get a deeper understanding on those drivers. Will go through your other videos as well. Greetings from Germany! Andreas

[@OldePhart]

LOL, Good on you for showing how you messed up that fet. We all do it, few have the guts to admit it on video. Respect for that. Thank you for posting it, I think I might have the same issue on the dumpster find I'm trying to fix.

[@jamesf8783]

I find tvs and grab them and try to fix them and your videos have been very helpful so thank you!

[@garyplewa9277]

Excellent video. I'm learning a lot from your logical approach in troubleshooting. Thanks for uploading it. I'm intrigued by that LED tester, as I've never seen one before. I'm guessing it is a constant current source that stays within the limit of the LEDs to show if there is an open or a short. My 50" ONN "dumb" TV quit working one day after 2 years of great service, but when I shined a light at the screen I didn't see any ghosts, so I didn't think it was a backlight issue. I watched your video about the NVRAM chip replacement and was going to try replacing that IC, but my wife was wanting to watch TV and I was taking too long, so I bought a replacement Samsung "smart" TV, which I can't stand compared to the ONN. (Smart TV's in general, I don't care for). Perhaps one day I'll pull the ONN out of storage and have a 2nd try at fixing it.

[@whizzo55]

I hate it when I hear that snap sound, it means I messed up. Thanks BD!

[@rscelectrical7091]

Love it, total honesty: You show the mistakes as well 👍.

[@electropanel1211]

Nice video and i noticed when checking the mosfet underneath the power board that coating looked like some kind of spill but great analysis

[@bazanexpress100]

Thx for all your video. They inspired me to open up my TCL 50S45 to replace the HBH-L2 2228 21 led single strip. But I can’t seem to find it anywhere. Any suggestions?

[@carlosflores5754]

Very nice troubleshooting

[@Dyaxxis]

Excellent work. I do wonder what conformal coat the manufacturer uses. I've used xylene for most conformal coats I've had removed, which helped a lot since I can probe much easier without deforming probes or damaging solder joints and/or boards. EDIT: The usual manufacturers make offer their own "formulations" with different applicator styles (Chemtronics, TechSpray, MG Chemicals, MicroCare, etc.).

[@bigdog8882]

Thank you!

[@mplscarsales6652]

Best video out there what are these boards called is there a serial # I can find on my board so I can order same board I have 75” Onn Roku tv

[@FLYNHAWAIIN]

Love your videos, very detailed. I have a TCL 75S421 with dead LEDs but can see the image with a flashlight. The power board is giving me .66v to the first two red LED wires but the second two are 0v. Can I test the LED strips with my DC Power Supply Variable?

[@bigdog8882]

Good Question! Yes u can use a variable DC power supply. Just make sure the current setting is low; probably like 1 amp or less.

[@FLYNHAWAIIN]

@@bigdog8882 thanks for the reply and information. I did the repair but put a half inch crack on the screen being misaligned on the frame. I chopped it up as loss but wanted to check my work if I fixed the bad LED issue. Now when I turn it on I don’t have the backlight or the faint image with a flashlight. Any ideas? Everything is plugged in as it should. TCON-Board is humming. LED still outputting 66

[@dakid1990]

Where do I get a onn power supply board from

[@markmurillo5622]

I have a Hisense with the same problem as yours do you think it could be the same problem?

[@bigdog8882]

With Hisense its probably a backlight itself problem.

[@Talltechninja]

I changed my backlights on a 65” TCL and when I got it back together there were vertical lines going down the right side of the screen. Can you tell me what could that could be. I checked the connections to the main board and T-con board and all are connected correctly.

[@Bass42894]

Great video on this issue

[@lightshine6044]

Can you tell me the link to buy that pwm controller ic ocp 8129b? Thanks

[@deaded6087]

Hey! Love the video! I have a question that I need some help with. My tv has no backlight but ghosting, and some leds are burned. The voltage on the led supply is not constant and it shows pretty much 18-22 volts. I am thinking of replacing the led strip but I am worried that the next one will get fried too. Any suggestions or video recommendations on your channel?

[@bigdog8882]

Just replace ALL the strips to start. Thanks!

[@deaded6087]

@@bigdog8882 thanks a lot! I will try it then!

[@deaded6087]

@@bigdog8882 It was the strips! Thanks a lot!

[@techjdu]

Will you get voltage to the LEDs without any other boards plugged in, just the power supply?

[@bigdog8882]

All depends on how the LED circuit is designed to start via the BL ON command from the Main board. It most cases yes, but it will be a lower voltage until TV is powered On.

[@techjdu]

@@bigdog8882 Any idea what the BL ON voltage should be (I think it was either around 3 or 5v), and can I use an external power supply to trick tv's power supply into turning on the backlight? Thanks

[@bigdog8882]

@@techjdu Yeah 2.7 - 5 volts, Yes you can supply approx that much voltage to the Backlight On pin to turn on the LED circuit

[@techjdu]

@@bigdog8882 Thanks, I'll give it a shot.

[@r.m.parkerfishing7553]

Can you tell us where you order board for ONN?

[@oshynclair7592]

Geeshh, no response.. My son's 70-inch just blew out

[@rtwodtwo9338]

Bro the oscilloscope is ok to probe pwm dc volts at the secondary circuit ? Because there are high volts !

[@bigdog8882]

Yes you can

[@jessegalvan19]

Im dealing with this right now, i called a tv repair man they wanted to charge me $350 , i was like i might as well buy a new one lol…, but now that i see the problem i rather do it myself! Do you happen to have the part #? Or the a good link to buy the board ??

[@bigdog8882]

You have to look at your board and use the TV's model # to make sure it looks just like yours and/or find the part number on the sticker on the board.

[@electronicrepairservice2020]

Thanks for showing what the ultimate point of failure was, I kinda suspected it would be, I had something occur like this before with higher than normal voltages & that was the fault. I like the new scope ... how do you like it?? Seems to be reasonably priced on Amazon 🤔.

[@bigdog8882]

It sucks, dont get it. One day it just stop reading signals. I only used it like 10 times.

[@electronicrepairservice2020]

@@bigdog8882 Really? ok, thanks for the heads up. I think that brand may not be the best when it comes to portable scopes (based on some reviews I've read lately). I was hopeful it was gonna be a decent one ... oh well👍

[@traveonaanderson5673]

I replaced mine but the remote isn’t working at all or any remotes i buy I replaced the ir sensor but still nothing any ideas

[@bigdog8882]

Here is a good video on that. Thanks. kzbin.info/www/bejne/ooa6c2iljLmXhNk

[@JaCkDaRiPpEr100]

How was you able to disassemble this tv that is the problem I'm running into

[@bigdog8882]

Take the screws out, and I believe there are some screws on the bottom too, on the underside.

[@redr1150r]

I'm good at basic problems , but can't work at your level. Where did you get your training ?

[@bigdog8882]

Years of educating myself and Trial and Error. I've created a course that has dramatically shortened Tech's learning curve. Check it out.

[@dakid1990]

Which board did you change

[@kashaniqueguest2593]

How do I fix it if I can see the picture with a flashlight

[@electronicsrepairbasics_erb]

Great, Keep going 👍

[@bigdog8882]

Thanks ✌️

[@johnlucier8572]

Why not replace the part they are available?

[@Super-360]

Hey bigdog, I have a quick question I usually test the strips with a led tester as well while they are still plugged into the psu. Is this a problem? I did this on a tv I replaced all the strips on and it seems to be working great. -Thanks

[@bigdog8882]

Thats fine, but I always unplug them b4 I test just to be on the safe side from false voltage reading on the led tester.

[@Super-360]

@@bigdog8882 thanks.

[@soundqubedkiller5885]

I have the same tv. I can see the back light but when i use a flash light i don't see anything

[@douglashunt5342]

did I miss what the actual issue was? I know you said you accidentally popped that chip, but was that transistor the real problem? I have an Onn 70" Roku TV with no backlights, just the initial flicker, and it is "on" when you use a flashlight against the screen. Doing quick observation, the 10uf 450volt capacitor at the backlight section is swollen, so I'm going to replace it first, as I can only find used power boards on ebay from China at the moment.

[@jessemand1749]

Did you ever find the part and get it fixed. Onn told me to go to ubreakifix I think I’m going to try that.

[@istevemackanixs]

I like you you will teach me more about Electronic

[@tcasey154]

Hey man is there a way to get in contact with you so I can send you a couple pictures and a video or two if needed about a 2012 model samsung 3d TV that's doing some wierd discoloration at certain times based on what's displayed I could elaborate more here if need be but figured I'd ask and we could email about it or something rather than through the comment section

[@bigdog8882]

Join the Facebook group... facebook.com/groups/850660809553928

[@kimberlysecord5877]

How do you take it apart

[@bigdog8882]

Just use a phillips #2 screwdriver and remove all the screws on the bottom cover, U can't miss em.

[@khikhi_official]

Mines does the same thing it just blink what do i do

[@istevemackanixs]

Please my brother part me in the right direction of where did you get the tester from that you're using

[@pierrebruessard9714]

Bro I have the same exact tv. 65 onn roku tv. My wife hit the home button on the remote and next thing you know, it cut off. The redlight is blinking on and off. Black screen. No dimmed image. I can unplug it and plug it back and the red light comes on automatically and continue to blink. Is this what happen to yours? Is this a black light problem im having?

[@pierrebruessard9714]

And where are you located? I hope somewhere in Illinois. Ill pay for your service lbvs 🙏🏾

[@AngryPigXx]

I have the same issue with same tv. Also live in Illinois.

[@cameron6803]

But it had to have had a different problem for you to begin working on it to begin with. You wouldn’t have been working on the tv and breaking it through a mistake in the first place if there wasn’t a different issue?

[@jlabelle1985]

Need a place to perches tv parts???????

[@bigdog8882]

Ebay

[@catherienpierce4264]

I have the same tv mine was working just fine all day yesterday till about 730 I went to the kitchen fast to get a drink came back and it still had sound but no picture the same thing happened to us a year ago with a tlc roku tv is there a tv that's best to get

[@bigdog8882]

Personally, I love Sony. LG is good also.

[@catherienpierce4264]

@@bigdog8882 oh ok thank you for getting back we are going to get one tomorrow had to wait for day off lol

[@kingcafe9133]

Where are you locateddd omg I need your help

[@jstro-hobbytech]

That board looks like it was built to a price. Jesus

[@xstratosfearx]

As Donald Trump would say: ‘China’ 😂

[@Aamilahpeso]

So basically I need a new motherboard?

[@FFRTS2522]

thanks!!

[@davispcnet]

Hello, I have a magnavox TV, 50me313 with a suspect bad control board. Will any board marked BA31T0G0 201 3 work in it, or do I have to get a particular eeprom for it? I found a cheap board on ebay, but it's marked as a BA31T0G0 201 2. Will that work? Main symptom is that when plugged in, it makes a chirping sound. When I unplug the ribbon cable from the psu to the board, it stops. I ohmed out "a bunch" of surface mount caps and most of them showed continuity. More than I would want to replace.

[@bigdog8882]

There's actually only one on the Main board thats shorted, the other little brown caps are reading a short because their in series with the one thats actually shorted, put meter in ohms and find the one with the lowest resistance in milli ohms. Look on my channel page search bar, I think I made a video years ago on a similiar TV with the same problem. Thanks for watching. kzbin.info/www/bejne/q3KpdIeQeMdkeKM

[@albertodominguez150]

Subscribed

[@ademirvalentinnatal6498]

👏👏👏👏👏🇧🇷

[@GeminiBeautyII]

I heard a soft buzzing sound when I powered on t.v. a month ago. Powered on the t.v. today, and the screen is black. I used my flashlight, and sure enough, there is a picture🤦🏽‍♀️70in onn t.v.

[@bigdog8882]

Check the backlight capacitor 1st on the PS board by the led plug. Its usually swollen 10uF @ 450v. LED's could be bad too.

[@GeminiBeautyII]

@BigDog8882 Thank you ❤️

[@GeminiBeautyII]

​@BigDog8882 I found it and yes it is no longer flat on top. I was just curious to see if I could fix it. This is the second one within 2 weeks. I'll toss it and buy another. Mom called, and her t.v. doing the samething. It's our time to deal with the t.v. shenanigans 😂

[@jstro-hobbytech]

Shitty cheap scopes like that definitely have a place because the ground is floating