Nice one Mick, good fix. I have the exact same tyre pump. As for the diode across the track, and the other diode that has a capacitor symbol, it's possible the board went through several design iterations, with components / tracks being changed to make it work, then the designer wasn't allowed to tidy things up once they got a working solution due to time / budget constraints. You can imagine the conversation: Engineer: Hmmm it doesn't work, what happens if I change this, and this, and this? I'll just bodge it quick to check. Ah, fixed it. Manager: Great, we're on a deadline, send the final PCB design to the factory. Engineer: No wait, I only bodged it, I need to redesign the circuit board so it's congruent with the new design. Manager: How long will that take? Engineer: Half a day to change the design, then a week to get a few made up ones back from the factory, then I'll have to run all the full suite of tests again including a soak test, to make sure I haven't broken anything else by mistake, at least 2 weeks. Manager: No, time for that. Engineer: But the PCB, it looks funny, people will laugh. Manager: Don't be daft, no one's going to look. This is a $20 disposable piece of consumer electronics, it will definitely never be repaired and streamed live on KZfaq for the world to see your folly. We don't want to miss out on a week's sales for your pride. Ship it! 😆

Thats how I found your channel, from my mate Vince's channel.

That disappearing diode was so funny 😂. I spent a whole night looking for a part that was stuck to the sleeve of my jumper. The frustration then euphoria 😂😂

Finally, I found an electronics repair channel with an accent I can fully understand! Subbed, going to have a look at the rest of your videos, thanks for uploading!

Thank you , Mick, for showing us all what it is that you do to get these things fixed/repaired! I like your deductive reasoning and I always get something from what you show us in your videos!

Some great fault finding there. Well done! It pains me to think that so many things like this are often chucked out with the garbage when it's just a small inexpensive component which has failed. At least the former owner had the good sense to sell this one.

I thought it was the relay, almost sure, but I was totally wrong. 😂I love your channel. You teach me to not to jump to conclusions. Keep up the good work!

I hate it when youtubers say thanks for watching because its as if they believe I wasn't actually really interested. You are the one who should be thanked!

Another way of finding the faulty transistor might have been to check presence of drive voltage on the base and lack of switching of the collector.

I've had that compressor for 12 years now but mine only came with the cigarette plug. A tip to keep it running for years, take the compressor apart and lubricate it with high temperature grease as they aren't well lubricated at manufacture. I bought 2 others for my sons in-law and theirs overheated and seized up.

That's something that will probably stick with me. Not sure if I would have paid all that much attention to the abnormal voltage drop before seeing this. Good stuff.

I use that tiny sander you recommended a while back alll the time. That thing is incredibly handy for rust. Fixed a lot of things with it. Not related to this video but wanted to mention it

I have been picking up soldering practice kits off of Aliexpress, so far got a 0-30v variable power supply kit, a multiuse chip programmer with modules for different sorts of chips and ordered yesterday a fairly robust 2 channel amplifier kit with speakers. Quite enjoyable just putting these together and they cost only a few pounds each and already the PSU has earned its keep.

You are seriously the Truest Repairman

Great fix as always, thanks Mick 😃

I presume the transistor was switching the relay but when polarity was reversed the bypass diode carried enough current to blow it. Might have been tempted to replace any electrolytics that have been subject to reverse volts to avoid future problems.

Happy to see your channel is steadily growing and gaining subs! I enjoy your videos!

i didn't think you will be doing a video today i just got a notification from you tube im glad you did i always look forward to watching your videos on a Sunday morning thank you as always great video and all the best

It's nice that they give an replacement diode if D1 blows lol

Brilliant Mick well done I was thinking that transistor didn’t look right, thanks for the upload 😊

That was a hard one. Good work there.👍👍

That was an extremely interesting video, I have the very same model tyre inflator, still going so far, ( fingers crossed ) not being an electrical person, I didn't understand all the electrical side of the video, but hats off to you for your patience and detective work, very well done!

your so gifted to fix that stuff love your videos

Loving your channel. You fix a lot of different stuff, which I enjoy!

Fantastic fix my friend. Thanks for sharing your knowledge with the world. Kind regards. Paul.

Good methodical work.👍 Subbed.

Excellent work, as always. It's nice to see I'm not the only one whose wheels are caked in brake dust and other crap...🤣🤣

29:39 LOL I was laughing and telling you it was under the cap tester. I taught that something sticky was under the tester and it grabbed the diode.

Nice little puzzle ! what about that diode ! Lol that needs a change note issuing ! I bet you jumped out ya skin when that pump fired up great repair !..cheers.

Awesome ✌🏻✌🏻✌🏻 Great concentration 👍🏻👍🏻👍🏻

Its funny, only yesterday i watched MMVs video on tyre inflators. Synchronicity!? I found them interesting, so I find this interesting. Good choice.

Capacity readings on a Fluke 179 (frankly, on most multimeters) are never "precise" It is more an indication reading (ballpark) as an extra function. The tester you use is a way better option.

Love you work. Congrats on 10k. We must talk tools.

Nice one! 😊

Good job

I like the diode.... guess someone messed up the PCB layout and they still charged by the piece and put them on. Now you have a spare diode!

Superb!

thank for showing fault finding nice slow not leaving nothing out keep doing please help others learn more.,.,.,.,.,.,.,.,.,.,..

i would have just solder the power leads to the motor. and had done with it. aka some of the cheap ones . nothing fancy. i always use a separate gauge for checking pressure.

My friend you won a new subscriber 😅😁🙂🙂

I believe that may be a clamping diode. they are common in automotive relays to send the induced spike back through the coil when the relay coil is de energized

The beat of luck note is nice :)

The Diode is from a previous version, or for the new one but they have forgotten to remove the trace. But in any case in the actual state the Diode is not in use

Nice fault finding and repair :) I have 2016 Kia Rio, which came with quick fix kit, and no spare tyre at all, but to this day, still haven't even tried that compressor, maybe I should take a look at it some day, does it even work :P

Darren must be happy.

Nice one, the only observation i'd make is, while you had both transistors off the board, i'd have checked them both to compare. after all it might have been something as bizarre as a dry joint, if that is actually possible with SMD?

I have the same unit, everything works except the pressure shows only 0.0psi. Tried to fault find but gave up and use a manual pressure gauge!

Brilliant bit of investigative work Mick 👏👏😊👍 what is the name of the blue component mat you use please? I'd like to get one for my workshop, thanks 😊

Imagine if you weren’t filming this fix…. It could’ve been months before you found that diode; if at all.

As someone who used to solder professionally for a company that made boards for the telecoms industry (mobile phone masts), I have to say, soldering on that board is shocking!

Do you know that with most of them China testers if you hold power/test button for 10 seconds they go into calibration mode, good for zeroing out fly leads etc

Those SAE connectors are a pain in the ass. Always worth checking polarity before connecting and have a few reverse polarity adaptors in stock,.

These guides are priceless, is there an easy way to identify these smd components?. I am trying to fix a dead Zanussi electric clothes dryer control board, and I see a transistor that looks short like in your video marked 304 L, looked online and results show variations of 304 without the L, listing P type Mosfet?, uncertain. I have already replaced the Link chip, LNK304N. Any help appreciated, been at this forever and a day!

Could the diode that had the copper short underneath it (D11) be for the vacant diode location(D12) and the axial diode should be a cap.

The SOS is inverted (pulling low)

German Automobile huh John. Nice fix,so I'll let you off on this one 😁

I found you also from Vince!

30:00.. It's a well known fact that million to one chances come up nine out of ten.

I think you've got too have been watching my mate vince you even use the same blue mat LOL

I find it funny you blocked his username from the message you got from him but left it on the ebay listing :) All good to me, just found it funny.

Well done. That protection diode is not living up to its name, I was expecting a lot more damage when the supply was originally reversed. You are obviously not familiar with the blow track before diode, protection method and the recent standards change to the capacitor symbol (now meaning diode), ho, ho.

I came from Vince too!

If I had a compressor like that i'd bypass that relay and put a switch so you can just turn the motor on or off. I'm from the days when you plug it into the cigarette lighter in your car it starts up immediately. None of the electronics crap.

Probably the capacitor on the silkscreen was deemed unnecessary, and the through-hole diode was cheaper at the time than the SMD diode at D12.

Diode across track may be for spare use purpose.

That diode across a track is an odd thing! Circuit board goof I would wager. What is the brand of soldering iron you use? Thanks for the info.

That diode dude is trying to scape lols

I have a milwaukee 2792-20 radio charger and the power button does not work, the red led lights up for a bit then shuts off. The charging part works though, it’s just the radio that isn’t working. Could you possibly try and help me?

SOS in a square wave. Almost looks like a pwm signal

hi mate ive from the NE i bought an ebike a year ago and its stopped working any chance you can have a look ive tried to buy a controller and display for it but the manafacturer says they dont sell spares to the uk and wont honour the Gaurantee if you could help id really appreciate it thanks alot mal

Help please. DIYer - no expert here. I have a pump of similar construction. When on, pump splutters and dies with maybe 1 rotation of crank. Relay clicks. Mechanism good but motor notchy. Power to unit, 12v across board, on switch etc. 12v direct to motor from booster pack (pos and neg) and motor works fine! 6 sm resistors on rear all good. 2 A42 transistors NPNs test good. M7 diode voltage both ways so bad? 22microfarad capacitor discharged in situ, tested for resistance and dropped to 0v so open circuit and assumed bad? Understand it should trend to infinity. There's also a relay, I don't know how to test. Something on the board is defective. Many thanks 4 help :)

The sos on the led is inverted... lol

What’s the betting that the former owner has a similar connector on a different device with the opposite polarity - and inadvertently used the wrong lead ?

Been rather remiss with your videos of late, just catching up now. Initially I thought when you had the first connection problem, this will be a short vid. Then you found the croc clips reversed, thought same, then of course, why would you do a 40 min vid if you fixed it quick :-) I have one exactly the same, bought it to try to run my Steam Roller but of course need more volume output for it. Had an idea of making a little trailer with a 12v battery and compressor, then run the 1" scale engineer built roller on air, not found the right compressor yet though. 😞

Clamping diode

I think that it was pretty obvious it was going to be that transistor at fault.

First time seeing youtuber oscilloscope saying sos

Onboard spare diode😂😂😂😂

Just an educated guess that the PCB and components may be similar to another PCB model, and perhaps they run out of PCB's and the mindless Err-zoned out assembler soldered that sucker in as if it were the other PCB revision or model where the track doesn't exist. Oh.. and it could be on one side the soldering was inadvertently bridged to where it shouldn't be..

Ring. 12V. Digital. Automatic. Tyre. lnflator. Can. l. Fix. It?

In the real world, these tyre inflators are total pants.🤣

I should video my whole life, so I know where I left stuff!

The D in LCD stands for Display. So you always talk about a Liquid Crystal Display Display.

I had one of these, the dick diode was blown although you couldn't tell from looking at it.

Seems like lots of those get returned to Amazon. Cheap junk with zero quality control it seems.

I get so nervous with one bad habit you have, when you hold the pointy objects in your hand and work with other items, I’ve seen someone in advertently poked themselves in the eye. Just a bad habit,gives me the cringe.

You've lost a subscriber by blocking my comments.

Quit saying "EH" literally every 3 seconds, you say EH. I couldn't make it through the first minute of the video. Sorry, but constructive feedback is the only way you grow, and unfortunately, I'm not willing to follow that path with you. And to be honest, it was partly because you mentioned "my mate Vince"