Trying (AGAIN) To FIX This Toshiba TV With NO POWER | Revisit
Vložit
- čas přidán 4. 06. 2021
- I'm going to have another crack at this Toshiba 42YL863 LCD TV that had no power!
Will I be able to fix it this time?
Hope you enjoy!
Steve
PS. I'm not an expert in repairs at all. I do this for fun, and it may not be the best or safest way to go about repairing broken stuff. I'm pretty good at melting plastic though. Please don't copy me - I'm an idiot.
SUBSCRIBE HERE: bit.ly/ssf-sub
SUPPORT ME on Patreon: bit.ly/ssf-patreon
FOLLOW ME on Facebook: bit.ly/ssf-fbook
The magic things I use to break stuff;
My soldering iron: amzn.to/2Isf360
My microscope: amzn.to/2VP3msU
My multimeter: amzn.to/2LjBgnN
My thermal cam: amzn.to/34IFjjP
Filming Equipment;
My camera: amzn.to/38IdR7s
My microphone: amzn.to/3rCriPc
My VO mic: amzn.to/3pz2c1L - Jak na to + styl
Break Yo'self Fool
(this is a spoiler saver, by the way)
Didn't work this time, I saw vinces comment haha
🤣
No cows were harmed in the making of this film. 🔪 🩸 🐮
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. :-)
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.
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.
Well done Steve 👍
Thanks Vince! 😊
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.
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.
Man takes a long time to get ready for the pub, but when I saw his hair it was worth it.
I have almost zero clue about any of the stuff you talk about! I still love it!
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!
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.
“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 !!
Thanks Guy! Yeah, a well deserved pint. I've definitely learnt a little bit more. Cheers! 🍻👍
@@StezStixFix Szanuję, po robocie na piwo do pubu. Nadal brakuje takiej kultury picia piwa u nas w Polsce - kojarzy się to tylko z alkoholizmem, niestety.
P.S.:: that was some long shower out there 😎
i admire your courage to try things other people critique you i am the opposite good on you
Thanks Old Guy! 👍
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.
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.
Thanks Marko! 👍
Well done mate! I LOVE your content!
"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 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.
GET IN THERE!!!!!!!!!!! Nice work
The two 1.5 ohm resistors are current sensing resistors.
Varistors for it's friends.
Well done man !!!!!!!!
Well done 👍
Well done Steve Nice fix 👍
Thanks Geneo! 👍😊
Excellent Steve! A well deserved beer indeed! Cheers
Thanks Arreglando! The beer tasted great after that! 😊
Yay! Quite the adventure
1st class video to watch thank you take care kind regards from me kenneth👍
great fix on video and have a great day
Thank you Joseph! 😊
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 👍
Thanks Chris! ☺
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
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
Haha 😄 Thanks G B! 😁 👍
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.
Thanks Ripley, that makes sense! 👍
ME LEARN
That thing IS awesome.
It certainly is! I've been thinking back to a PS4 controller I did, where it took me about an hour to get the analog stick off! That thing would've been quite useful! 😬
Great job
Thanks Alvin! 👍
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 👍
Thanks Chris! That all makes perfect sense, and I will definitely do some more research. Much appreciated 👍
Nice fix!
Thanks Tech! 😁
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.
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. :)
hi bud l am so glad you went back to it well done you got working Hey
Thanks Bunny! Yeah, I'm very happy that I went back to it. I've learnt a bit along the way too! 👍
Great video, I bet that pint tasted even better.
Certainly did! Thanks Dan 👍
Current sense resistors!
"Pushing the ground" 🤣🤣😂
Nice work! 🍺
Thanks Micro! 🍻
very good
Gets home from the pub just in time to see the fire engines leaving, jk, good vid.
🤣 luckily not on this occasion! 😁
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.
Persistence was key for this one. Superb work!
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.
You had WAY too much fun with that de soldering iron...
*Leaves to go and buy one myself*
Great video pal, congrats 🥳
Haha, cheers mate! It really is a cracking tool, makes through-hole chip removal a doddle! I like it a lot 😁
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
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.
Well done! A strange one possible filter shorting when getting warm?
Great work, Steve! I'm only sorry that you didn't like your desoldering gun... 😀😁😂
😁 haha, thanks Pedro! Can't believe I've never used it before. It's It's game changer! 😊
Nice.
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
Ah, thanks Darren! That makes sense! 👍
Those resistors I suspect are there for two reasons, they are there for a common ground with a bonus of limiting earth loops "hum in speakers or undesirable wave forms in digital circuits" but because there are also vastly differing voltages and or types of Power rails that they are separating, They will end up being Fried Err-damaged over more sensitive and more expensive components that they are feeding should a serious fault occur..
yey you fixed it :)
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... 🤞😖
Thanks Toxo! Yeah, that's the only usage of cell I've heard before. Very odd that my tester read it as such, but by all accounts those resistors were ok and supposed to be there anyhow! 🤷 TV is still good, almost a week later, but I will see how it long it lasts! 😬
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
I work in telecommunication industry and that's what we call a high resistance open which can cause arcing which could blow fuses.
Nice
Green lights are goooood...
Cheers! 🍻 🍺😊
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.
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
Hi Andy! Yes, they were in parallel. That does make sense. And 100% agree with you on the component tester. It was only cheap and is quite useful for a few things, but in this instance it really threw me off! 👍
Also called current sense resistor, used to measure current in a circuit while dissipating as little power as possible. They will be close to being a short circuit.
I NEED to go to the pub... Steve 2021 🤣
😁 it was an absolute requirement mate! 🤣
@@StezStixFix haha I bet 😅 maybe we'll have to meet up for a beer one day 😅
@@TheCod3r 😁 defo mate👍
@@StezStixFix ooh while I've got you actually, podcasts start on my second channel tomorrow, would love for you to come on one day for a natter 😀
@@TheCod3r yeah, sounds good mate. Definitely up for that. I'll make sure I have a few beers first 🍺
Break yoself fool 🤣🤣 Nice fix man even with the different donor board 👌
😁 Cheers mate!
finally success! now for a pint of bitter😊
Pub Time!!
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
Only just found your channel in the last few days & DVD Fab do a Region resetter in their freeware section if that helps ?
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
Ah ha! Thanks Reace, that makes sense 👍 Thank you!
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 .👍
👍 Cheers Davey, I think I'll get me some rubber gloves for next time! Wow, not sure I wanna be dealing with 10k volts though! ⚡🤯 😬
@@StezStixFix ha 10kv, i was hit the other day with between 20kv and 30kv mucking about under the hood of my car
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 .
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
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?
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! 😁👍
You are a machine!!!!!!
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???
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..
Thanks 🐨! I'm gonna add that to my bed time reading schedule! Thanks as always! 👍
Solder remooooover
"Is it a fuse?"
...
"I'm confused"
Haha
Nice one Steve!
I got the same desoldering gun recently, what temperature do you usually have it on when using it?
What brand is it?
Nice. The 1st use of the Moo moo soldering gun!!!!
Your style is unorthodox. -But effective
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 ?
Hello i use one too. It’s a station it comes with gun and station itself
1:55 Imagine trying to fix the old tv, with the high voltage cable having a hole.
i Do Need to go to The Pub LOL, That's what i'm doing now.
Wouldn't it be easier to get a new replacement power supply unit instead?
Those resistors are low value so they will show as if they’re short
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.
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.
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
Thanks Hugh. This one is still going strong, but yeah I suspect it might fail again at some point! 😬
Your showers longer than my bath lol
😬🤣🤣
Better to jumper it, rather than potentially introduce another issue
MOOOO
Nice one just be honest you knew what the issue was you just wanted to use the desoldering tool
Haha, thanks Jonathan! I wish I knew, but that desoldering tool is definitely a game-changer! 😁