How to diagnose samsung TV that appears to be stuck in a boot loop.

I strongly recommend you watch this video right to the end !
Many engineers mistakenly replace the wrong parts thinking this is stuck in a boot loop , when in fact it isn't .
Don't make a costly mistake and replace the wrong item !!

[FlingwingNZ]

Hi Michael. My goodness you are truly a golden find on YouYube. I live in a small rural town doing tech repair work. I'm sick of throwing out modern TV's because there's no service manuals...I've already fixed two based on the advice you've given in your videos. Many thanks. Your technical knowledge and old skool fault-finding methodology is gold! Terry, New Zealand.

[JP-xlmd]

Great I’ll just throw mine away and never buy a Samsung again ever!

[fadedexile]

I'm watching how to repair my 2 year old Samsung on my 12 year old Vizio.

[ultron]

Great find to add to this I have a Samsung LN46 that has been through all the bad cap problems on the power board but one day go stuck in the boot loop like this but would eventually stay on after about 20 tries. Turned out it was a few of those yellow tantalum caps on the voltage regulators that power the main board on the 3 volt side. It was a tricky find but after replacing the tv is still working. I know samsung also has a "fault" circuit on the old ccfl back lit models as if a voltage is present it will shut down. Keep up the good work.

[paparoysworkshop]

I've just come across this exact same problem on a Samsung 55" TV. I went through the typical tests including taping off some of the lines on those ribbon cables and the TV would do as you have shown in this video. But, further testing (many hours of testing) showed that on the circuit board at the bottom of the screen (the one attached to the screen that runs the width of the screen) has some diode packs. One of these diode packs was getting hot. I removed the device from the circuit board and now the TV works fine. I found two shorts within the diode pack itself. Pins 1 and 10 were shorted and pins 5 and 6 were shorted.

Without the schematics (and since I didn't want to try to reverse engineer it) I can only make assumptions on what these diode packs did. Since the TV works without it, I assume it's some sort of back EMF prevention as it also appears to be installed with reverse polarity. But I could be wrong about this. The part number on it is 4268H but I could not find any datasheet for it. It measures about 0.5mm x 2mm. So far, the TV is working without any apparent problems but only time will tell if missing this part will impact something else in the future. At the moment, I'm keeping an eye out for a similar TV for salvage to replace the part with. I hope to put out a video regarding this repair soon. But it's on a very long To-Do list.

[steve]

Blimey Michael still repairing then, I used to occasionally pop into your old shop in Buxton town centre. I gave up on TV repairs when LED came out. I remember video recorders first coming out and also witnessed their demise, we are the only generation to see this. Even the “Television” magazine went years ago. Wonder where my stock of PL509 and PY500A valves went 😀

[ewoqf]

Once you've got an image, you should go into the service menu, to svc, to info and then to error counter. On newer sets there is an item " TCON PMIC COUNT". This shows if the bootloop is/was due to a fault in the pmic, which is the power management IC.

[fgconsolerepairs]

Thanks i was able to fix a Samsung 55" TV by doing this exact thing! I already changed the PSU thinking it was power related but after stumbling across this video all is well now! 2 lines were broken and now the TV stays on!

[dominoez]

Thanks for posting. Helped me diagnose. Ultimately found that the issue was a short with one of the connectors. Used the scotch tape method and now it’s fixed!

[rodolfourbaneja]

Michael thank you very much for your video, I managed to solve the bootloop of my Samsung Q80R TV. I was hopeless and was counting on losing the TV. The repair cost is very high due to the need to replace the display, as informed by the manufacturer.

[xyredmax]

Sadly a sign of the times in this disposable world we live in

[DavidSmith-dmew]

Thank you for posting this video, your info was exactly what I needed to diagnose a faulty panned on my 70" samsung tv that failed with the same symptoms. You rock!

[wisheruk]

The panels are rubbish these days I use sellotape to isolate the pins 😊
Thanks Michael

[markpirateuk]

These newer panels are utter crap, as you say, a brand new set is cheaper than a replacement screen.
My 74 year old Pye set is still producing a great picture on it's original Mullard tube! So much for

[stevehead]

A not so smart TV. Last thing I want is a TV whinging on about no HDMI connections. Give me a thick TV (monitor). tiny computer, keyboard and mouse and I'm happy. Thanks for the video.

[lili_]

Aw man, thanks for the video. I did found the pin at fault and fixed the boot loop, but.. i think i damaged the led panel while opening the tv up, cos it doesnt show anything anymore, but it does turn on now normally. Lol. Time for a new tv, i guess. Cheers!

[cristianluchian]

Thank You Sire for this tutorial it was of great help to me, I was in a difficult situation

[besterspieler]

Lmao you saved my a**.
I was about to order a new Mainboard since freezing the NAND didnt help. Watching your video I disconnected the Screen and saw the backlight kept on. After reconnecting the screen all was fine again! Just a bad contact probably

[johnh]

pin 18 from the top of the ribbon cable is the one at least on my tv that was causing it, was able to cover just pin 18 with some scotch tape and it seemed to do the trick, there are a small amount of lines at the top left corner, but they're not that noticeable, you could probably even lift that pin off of the ribbon cable connecter if you really wanted, how I found it was, I did his trick with some scotch tape and kept moving down pin by pin until the tv wouldn’t turn on again, then I moved one pin up and then it would work, so it had to be that pin, which was pin 18, it may be a different pin on yours, but give it a try before you give up on your tv

[dominikmayer]

Thank you very much for this video! With this solution, the TV works again. I found the perfect position for the little plastic strip and it works like before without any problem.