Full Troubleshooting and Repair method for any Samsung Flat Screen TV SMPS board.

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2 жыл бұрын

We have a Samsung power supply board BN44-00667A that is totally dead with no standby voltage. This SMPS board is mainly used in Samsung LED TV model's UN46EH5000FXZA and UN46EH5300FXZA.
We will begin to troubleshoot the primary side of the smps after discovering we have no standby voltage on the secondary side.
We will start with the switching MosFet's around the switching transformer and also the PWM IC chip thats driving the Mosfet.
In order to start the switching process by the transformer which is connected to the Drain pin of the Mosfet; the Gate pin receive's a Pulse from the Pulse Width Modulation (PWM) IC which turns the Mosfet On and Off approximately 50,000 times per second or in other words, at a 50 kilo Hertz frequency.
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Пікірлер: 34

@OilBaron100 Жыл бұрын

You sure have alot of videos, and there’s alot of knowledge in them.

@bigdog8882 Жыл бұрын

Thank U B.

@marksplace 2 жыл бұрын

I've been watching you for awhile now and you've came along way with your videos. I just want to chime in to thank you for all your videos and the awesome explanation on how power supplies work and how to troubleshoot them. You're like the king of TV repair videos, keep up the good work.

@bigdog8882 2 жыл бұрын

Appreciate You, thanks. Don't forget to subscribe if you haven't already.

@princesswalt4010 2 жыл бұрын

i started in electronics out of high school after 1993, and i truly miss fixing shit to component level! Thanks for your videos, man! p.s: loving that meter!

@thetechdoc792 2 жыл бұрын

I'm learning a lot from your videos. Thank you Bigdog.

@bigdog8882 2 жыл бұрын

Your quite Welcome my friend. Please subscribe to the Channel. Blessings.

@thetechdoc792 2 жыл бұрын

@bigdog8882 the second I found your chan, I subbed. I also asked on another of your videos (55 inch TCL disassembly I believe) about how some people think it's not worth fixing modern TVs, what is your take, cause I'm opening a shop in my area (southern WV)

@Crewdog77 2 жыл бұрын

You got theory down, nice diagnosis. been subscribed for a year or so, you have helped me with my TV hustle a lot. thank you! two things, get a good solder fume extractor, that stuff can hurt you. the cheap ones suck. Also Flux is your friend, get some Amtech NC-559 and the solder will run to your braid. cheers!

@tamassinty 2 жыл бұрын

Big dog, you're genius. You do always find the solution.

@KyleSand 2 жыл бұрын

Thank you for sharing your experience.

@pocketwatch6272 2 жыл бұрын

Thanks Bigdog8882 , you’re the man!

@bigdog8882 2 жыл бұрын

Don't forget to Subscribe. Thanks

@apachecomm 2 жыл бұрын

Sir, you explained very well, thank you very much. I think it is more efficient to tell by drawing in this way, thank you very much

@MrBurny23 2 жыл бұрын

Another great well explained video From the top dog,👌 Keep up the great work 👍

@michaelknowles1651 2 жыл бұрын

Much appreciated for your videos they are absolutely amazing. I wondered if you are able to point in the direction with something if possible. UK voltage @ 240v. When checking the output pins on my plug socket 240v👍. When plugging it into TV and checking voltage again this is reducing to 109v. Same voltage at my bridge rectifier. If I remove the fuse and check the leg that holds the fuse the voltage is now back at 240v👍. As soon as I apply the fuse in circuit, i then incur the voltage drop. So I must have something drawing down the voltage? I Removed the bridge rectifier to see if it could be this and minimise the amount to diagnose however I still get the voltage drop when removed. I know you work on 110v, have you ever plugged in your 110v plug and received a much reduced voltage to this. Many thank you

@bigdog8882 2 жыл бұрын

Is the Device working or dead? Also Check to make to make sure device doesn't have a 110v/220v selector switch on the back by the plug.

@michaelknowles1651 2 жыл бұрын

Howdy @@bigdog8882 many thanx for the reply. The TV is currently dead. Initially it was just showing a red light but I had a mishap with earthing by bridge rectifier (whoops big spark) by accident. I have replaced this since and now obtaining these 109v around the place. However my red standby light hasn't restored either. This board has certainly been a learning process for me and I'm really keen to find the sourse of the issue. Sorry the plug doesn't have a switch to alter between 110 or 240. It's just a straight 240v plug. Once again many thanx for yr content. I dont know how many times I have viewed these 2 latest videos. Stay safe and keep up the great work

@ademirvalentinnatal6498 2 жыл бұрын

Very good🇧🇷🇧🇷

@melvinbarnes197 2 жыл бұрын

Thanks for your videos on troubleshooting big screen tvs. I had a 60" Samsung that the screen went black, with your help, figured the LED's were bad. ordered new ones installed and they worked fine. I must have did something to the screen or one of the flat cables. The screen comes on but nothing but streaks of different colors, some top to bottom some looks like lighten strikes. I figure its junk. I don't know what to do with the boards and LED's, shame to toss them. would you be interested in them?

@saulbalderas387 Жыл бұрын

You had the probe's negative alligator clip attached to earth ground? Did you use an isolation x-frm??

@bigdog8882 Жыл бұрын

always

@ElysseShrestha Жыл бұрын

can you show or mention output voltage for LED diver of this PSU?

@gregorycontreras1662 2 жыл бұрын

Big Dog, Thank you for sharing, I too have the Vizio 55" MODEL 55DO Same model same problem, less the dark spot. My tv comes on and then starts flashing and doesn't stop. I can see the Channel at every flash but it is flashing like a strobe light and does not come on continuously, just flashes. ALREADY CHANGE ALL THE LED LIGHTS Please help.

@elkarl3735 2 жыл бұрын

Problem is in Samsung 50 eh 5300f I change power supply Maine bord t con leds screen

@henryhuddlestonjr4738 2 жыл бұрын

I have the same TV and same problem. I am going to purchase one of those meters, thanks for the link. I would like to know where you got a schematic for the SMPS, especially if it is a BN44-00667A ?

@bigdog8882 2 жыл бұрын

Just "Google it" thanks Bro.

@henryhuddlestonjr4738 2 жыл бұрын

@@bigdog8882 I have and still can't find it....But thank you...I did purchase that meter ;-)

@noecruzdelangel8738 10 ай бұрын

Hello Big Dog .. Regards from Veracruz Mexico. I am starting with tv repairing , can you help me with suggest to get the full BN-044-00667A schematic diagram? I cant find it in the web. Thank You.