Trying (AGAIN) To FIX This Toshiba TV With NO POWER | Revisit 

Break Yo'self Fool (this is a spoiler saver, by the way)

You may want to consider using a lighter touch on the desoldering gun. You shouldn't need to use any pressure, the solder wicks onto the tip. Hulk smashing it down into the board can damage pads and traces, especially when you're flexing the board. Keep the desoldering iron tip tinned just as you would an iron. They are magic when they work right. This video is over a year old, so I assume you know this by now, but just thought I'd mention it for anyone else trying this at home. :-)

It’s the Mooing Solder Sucker’s origin story! And yes I believe those yellow things are high frequency signal transformers. They look a bit shorter than I remember, but idk what else they would be. Those wire wound resistors are usually employed as oscillation attenuation adjustment in transformer circuits. I suppose it could be for discharge or suppression as well. Hard to tell from here.

Those resistors are there to limit the current that is flowing through the mosfet or transtor that it is connected to, in this case the source (mosfet) or emitter (transistor). The higher the current through the mosfet ( and those resistors) the higher the voltage drop over those resistors, if the drop gets to big the ‘current sensing circuit’ triggers an ‘ over current protection’ and switches the gatedrive to the mosfet off. Similar resistors are found in power amplifiers between the emitters of the powertransistors and the speaker output.

"I need to go to the pub!!" My brother has his priorities and I respect that.

Well done Steve 👍

Steve, look at the value of the resistor before you condemn things. If one side is ground and the resistor is say 2ohms your meter is going to beep to tell you you have a short or low resistance. Remember meters will beep on continuity between a certain range of resistance, possibly for example between 0 - 50ohms. Examine what you are testing!! Also when testing switch mode power supplies you often see what appears to be shorts but are actually measuring the resistance of coils. Yes the coil is short at DC, but it has impedance that is not a short at AC. Remember these circuits are SWITCHING to generate a high frequency across the transformers to give the required AC output voltages that are rectified back into DC to power the rest of the circuits. They use switch mode power supply circuits to reduce the amount of weight and iron cores involved as the transformers can be much smaller at the higher frequencies. Down side is they produce high frequency noise. That noise however is somewhat filtered by the common mode filter chokes at the AC input stage. You could bypass those input chokes for testing purposes but you should replace if they are faulty to keep the RF noise generated by the SMPS at a minimum and not fed back onto your AC input mains and into your house wiring and other AC powered devices.

Steve is so relatable, I always slightly panic from a standby light on my television as well.

Man takes a long time to get ready for the pub, but when I saw his hair it was worth it.

The EMI filter is not there to filter incoming power. The switching power supply generates lots of RF noise and the filter is meant to block it from back feeding onto the mains and causing interference on other devices.

For a man who has no experience on working on TVs, you have done very well. I have some electronic knowledge (enough) to repair most electronic devices. I've been working on an LG CRT TV (dead set) for two months, now and I just can't seem to find the fault. It could be anything, with a TV.

So here we are in 2023 and I just found the video where you started using the desoldering gun, which has been a mainstay since!

I have almost zero clue about any of the stuff you talk about! I still love it!

“I do need to go to the pub….” Wise words and always better to go to the pub after fixing potentially lethal electronics….. Well done Steve, more learning has taken place !!

Ah, the ol' "I don't expect this to work but it does" conundrum. Good fix, you kept at it mate! I would've long given up at some point.

So glad you made a follow up video. I only recently found your channel so youtubes playing your videos back to back for me. I love your honesty when your not sure or don't know what to do. I wish I had your skills as I have a 52 inch tv that no longer turns on too. Love the videos.

i admire your courage to try things other people critique you i am the opposite good on you

Well done mate! I LOVE your content!

In general multimeters beep "short" even with small resistances, because it's "close enough", usually wires and pcb traces etc. add a tiny resistance, but it's still practically a "short" and needs to be classified as one.

"Break yo self fool" you had me dying. 🤣 That solder sucker sounds like it's saying Ahhhhhhhh

Old video but still deserve a well done watch part 1 and 2 great stuff man I'm still dabbling and have TV with no power so was worth the watch mine I think is just power adapter should be simple

The two 1.5 ohm resistors are current sensing resistors.

GET IN THERE!!!!!!!!!!! Nice work

Well done Steve Nice fix 👍

Excellent Steve! A well deserved beer indeed! Cheers

Well done man !!!!!!!!

The real problem could've been the filter/choke only. If the wires are shorting through the base of the coil (where the wires are wound on), then pretty much only the fuse would blow. This also makes sense that it would only blow the fuse when the tv has heated up enough for the short to happen. Also no damage is done to the rest of the TV if the short happens there. On a side note: Usually when there's a short in the primarily side of a SMPS, often the MOSFET is blown and shorted permanently

The black line across the board is to show the isolation from the 'hot' side to the cold side. A high value resistor and normally a capacitor is used to provide a reference to earth from the hot to cold sides. Dont measure from cold ground side to hot side as they are not the same thing.

Well done 👍

You definitely earned that pint! These videos are getting better and better ... keep up the good work. I have to question how much learning is actually going on in the beer school though :D

great fix on video and have a great day

Hey Steve good to see your revisit on this Toshiba 42YL863 LCD TV that you managed to fix well done was another interesting vlog you did there - Nice 1 👍

1st class video to watch thank you take care kind regards from me kenneth👍

Nice video ... more fixes should end with a well deserved pint. 👏 Those were power resistors you were toying with which, on one side of the transformer are a path to ground but presumably the opposite side windings are where the power for the circuitry is taken ... see if you can find the circuit diagram for a similar model board on somewhere like BadCaps or via general googling to help put them in context. If it was me doing the fix I’d run it as my main tv for a few weeks before passing it on, coils are weak points and makes sense as a point of failure which didn’t kill the fuse, but I never discount collateral damage which might take time to show itself. Keep up the great work 👍

Nice fix!

Great job

Yay! Quite the adventure

If that choke has the same part number it should be fine. Those resistors just tied two sections to the board to the same ground where there’s a physical isolation point. It’ll keep the high frequency out of the DC section of that power supply.

That thing IS awesome.

reminds me of a Panasonic TV i repaired for a customer who would only ever see me when i worked at a certain electrical retailer who i will not mention for certain reasons....TV was out of warranty but they had fallen in love with it and asked me what i can do...went to their home opened it up and see at least 11 blown parts which may of been subjected to water or liquid...replaced em and it waorked...they gave me £100 for 20min of work

hi bud l am so glad you went back to it well done you got working Hey

Good job! It's always tough without schematics, sometimes something obvious can trip you up, he, he! With the high voltage, using one hand for testing and keeping that other hand totally clear will keep any inadvertently touched voltage away from your chest...And you already have hands free of rings. Good technique. :)

Nice work! 🍺

Great video mate really enjoying your content would you happen to know where you got the desoldering tool really like the look of it mines just packed up lol all the best

Great video, I bet that pint tasted even better.

Current sense resistors! "Pushing the ground" 🤣🤣😂

It is common where there are multiple connections to ground to include a low value resistor in each to avoid any stray magnetic field from inducing a significant circulating current - called a hum loop in audio equipment but will also cause bars in a video display.

very good

Gets home from the pub just in time to see the fire engines leaving, jk, good vid.

When working on power components, you could use your bench-power supply to hook in 5v/12v on the low power side and current limit it to very low numbers to get a current path to follow. The smaller choke looked a bit warmer than the right size, which makes sense, bigger wires = less resistance. So the TV might run a little warmer, but otherwise it should be fine.

Well done! A strange one possible filter shorting when getting warm?

You had WAY too much fun with that de soldering iron... *Leaves to go and buy one myself* Great video pal, congrats 🥳

I think there is current sense going on with those resistors so they can get an accurate idea of how much current is passing through the circuit

Persistence was key for this one. Superb work!

These days I don't have a CRT to use my Nintendo Zapper on - I'll try repurposing it as a desoldering tool. 😝 Interesting that the resistor showed up a a "cell" - cells, or battery in their combined multiple term, is a long-term power storage device. Not what I'd expect from a resistor... 🤪 Phil, from the JDT Discord, informed me (on my Electronics For The Lesser Knowledgeable videos) the a PP3 9V "smoke alarm" battery is actually constructed of multiple cells. I personally don't fancy dismantling one to prove this. 😁😂 Anyhow Steve, good work. 🍻 Keep us viewers informed if the TV continues to behave. I hope to find the time and pluck up the courage to tackle the Samsung 32" soon... 🤞😖

Nice.

Switch mode PSU's are not like linear power supplies (which goes through a step down transformer then a bridge rectifier which is lower voltage) but goes though a bridge rectifier with much higher DC voltage coming out so be careful there. You fixed that TV with more luck than judgment which was comical to watch. Those chokes stop interference to other devices in the house, such as radio's and I think that's something to do with the FCC mark on the back cover. You can temporarily short them out for testing if you know the rest of the circuit is good.

Great work, Steve! I'm only sorry that you didn't like your desoldering gun... 😀😁😂

Nice

yey you fixed it :)

i don't know if anyone have said this but i think you may have used your Multi-Function Tester incorrectly. The top row of pins have numbers 123-1232. the bottom row is KAA-1233. the KAA part are for Zener diodes, avoid that when testing other stuff.

Brilliant 👏 looks like it will work for a good few years still. Regarding the resistors electricity follows the least resistant path so my guess is it doesn’t short to the ground because of the resistor. Shocker 😉 Like you I still dunno the purpose usually they are used to switch the transistors

I work in telecommunication industry and that's what we call a high resistance open which can cause arcing which could blow fuses.

Only just found your channel in the last few days & DVD Fab do a Region resetter in their freeware section if that helps ?

Break yoself fool 🤣🤣 Nice fix man even with the different donor board 👌

Cheers! 🍻 🍺😊

I NEED to go to the pub... Steve 2021 🤣

Pub Time!!

You should not be so terrified about 220 volt it's the amps that kill ! Most electricians that I know work with live connections all day long and feel fine about it! Im sure that caution is always a good thing but too much is silly

Hi!! New viewers / fans from Canada!!! Looking forward to more videos (except they are slowing me down form editing mine because I just keep watching yours LOL!!) Anyway just wanted to say hi, and I'd like to try to find you something broken on one of our VLOGS, then send it to you to see if you can fix it! (and keep it of course)... if you're up for something like that! 😁👍

finally success! now for a pint of bitter😊

Green lights are goooood...

Those 0.15 Ohm resistors are for current sensing, and that transformer is part of the PFC (power factor correction) circuit actually. In other words, you're looking at the active PFC section.

Hi Steve can I have your opinion on a my tv has power but a pulsing blue light with nothing Turing on , have you came across this before or any ideas would be great , thank you

low value resistors - could be a current shunt, dropping a small amount of voltage proportional to the current flowing through them? think they were in parallel so .15 becomes ..0075 reason for "cell" is because those component testers are about as much use as an ashtray on a motorbike

Nice one Steve! I got the same desoldering gun recently, what temperature do you usually have it on when using it?

I think your friend lied about the fuse blowing. I can not see how then open choke would cause the fuse to blow, I'm thinking he did something silly when messing around inside and it was that which blew the fuse. I mean I've only seen such violently blown fuses when a direct short to ground occurs. The thermistors probably go open when heat inside the unit becomes outside the factory tolerances, and the circuitry then puts the tv into standby mode until cabinet temperatures become more normal, of coarse that's just a guess .

Rubber gloves should lower your fear of the high voltage Steve. I had a whack of 10,000 volts from an old CRT TV in the 70's ,but I still dabble . Great vid mate,hope you had a skinful,my turn on Sunday .👍

There we go.. you done it! bet you got an adrenalin rush when you saw that Far !? Err-Um Sucker working. Err-During quiet times it might pay to google, " what does each electronic component do in a circuit? " APU I dropped a like..

It’s displaying it’s own guts you sick man lol

Ahh.... SMPS they can leave your head spinning, nice work, still wondering what led to the original fault?

You are a machine!!!!!!

They act like a spring, when electricity flows through the coils, it generates a magnetic field, which then induces a current back into the coil which opposes the initial current flow, and so acts as a resistor sort of to allow that initial surge to occur and not blow the fuse

Steve I've a jvc 48" LCD. Flat screen the power light is on but won't switch on!.any I dear what could be wrong with it???

"Is it a fuse?" ... "I'm confused" Haha

Your style is unorthodox. -But effective

Solder remooooover

1:55 Imagine trying to fix the old tv, with the high voltage cable having a hole.

Nice. The 1st use of the Moo moo soldering gun!!!!

Wouldn't it be easier to get a new replacement power supply unit instead?

De-soldering tool… haha! I can guarantee you go back to just wicking the solder off the board. I really do not know anyone that uses these all the time. They do have a place and they can help but it seems like people just go back to wicking the solder off the boards. Time will tell... Problem you get is that it sticks to the board.

I have one question about desoldering gun I want to buy a one so it's come only the gun or the gun come with machine ?

Those resistors are low value so they will show as if they’re short

i Do Need to go to The Pub LOL, That's what i'm doing now.

There a common fault on Toshiba's, well in our workshop anyway, the boss bought a shed load for our rentals, yes commercial rentals still going strong, NHS can't afford to buy.

This is really common with Toshiba tvs sometimes if you unplug then power back up they are OK but don't live for long once fault rears it's ugly head

Your showers longer than my bath lol

Better to jumper it, rather than potentially introduce another issue

MOOOO

“I do NEED to go to the pub”