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How to repair with a hot air soldering rework station

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Leo fixes his friend's MIDI sequencer with a broken screen (an Engine from Social Entropy Electronic Music Instruments). We take the unit apart, discuss different strategies for repairing gear, talk about why every lab should have a hot air rework station, and--after some trial and error--we finally fix the issue. Hooray for little sequencer. I hope it lives on and makes lots of techno.
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Опубликовано:

8 авг 2024

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Комментарии : 36

@BAMB00STER4EVER 5 лет назад

I like the company's approach to send a replacement IC instead of saying "send it to us, we'll fix it for $50"

@LeoMakes 5 лет назад

True. Plus international shipping and customs fees would have made this a really expensive repair. On the other hand, I do wonder what would happen if an inexperienced tech tried to fix it and accidentally made things worse... :/ I can see arguments for both sides. Anyway, thanks for watching!

@desktorp 5 лет назад

Impressive response from the manufacturer.

@jroemling 5 лет назад

Stockholm? I had no idea! You don't have a Swinglish accent at all! I am in Stockholm almost every day! 😊

@qzorn4440 Год назад

nice technique... the experience is where the money is at. 😎 thanks

@LeoMakes Год назад

Cheers mate!

@joonasfi 5 лет назад

Nice job!

@JoeMuc2008 5 лет назад

Boy that's a clean-looking device, inside and out. A repair well done! And I'm definitely jealous of your hot air station. I have one that looks exactly the same but makes a hell of noise because it contains a vibration pump. What sort of pump you get seems to be a matter of being lucky. I wasn't. And I wonder if the pump can be replaced by something better but for that I'd have to know what is inside yours :D - maybe if you have the time, could you look inside and let us know if there is any model or part number on the pump?

@SianaGearz 5 лет назад

techYES!

@squelchedotter 5 лет назад

The usual approach to shielding electronics from heat is Kapton (Polyimide) tape

@SianaGearz 5 лет назад

I love Kapton tape, but there's no particular advantage to it. I mean yeah it doesn't burn and sticks very well, removes cleanly, all that, but it doesn't really do anything interesting other than shielding from the air stream, it's about as thermally conductive as the display body underneath. Aluminium foil or tape acts as heatspreader/heatsink besides shielding from the air stream, it's not very easy to get it hot at all. You can use either.

@LeoMakes 5 лет назад

@@SianaGearz True. Also Kapton (polymide) tape tends to be pricey so I guard my precious roll like Gollum! :)

@SianaGearz 5 лет назад

@@LeoMakes I actually got a huuuge roll for 5€ from China including shipping, I think via eBay or Ali. The leader on it read "Koptan". I spoke to someone who compared it to guaranteed genuine one from 3M and it behaves identically.

@squelchedotter 5 лет назад

I wasn't really saying it's better :) Leo just seemed unsure about his solution, so I thought I'd chime in with what the "industry standard" solution is! Turns out, he was already aware of it. But yeah, it isn't exactly dirt cheap. The prices do drop though if you search for "polyimide" instead of the "Kapton" trademark though. Same stuff, just without the licensing fees.

@debaserNYC 5 лет назад

love your videos.. you think you could use some Kaptan tape around that display instead of aluminum foil?

@LeoMakes 5 лет назад

I think so, but Kapton tape is expensive. I have a little roll that I only use when nothing else will do. Otherwise I try to find cheaper alternatives.

@debaserNYC 5 лет назад

@@LeoMakes makes sense, looks like it worked out as well.. super clean job!

@fherr170 5 лет назад

Excellent video @LeoMakes !! Very informative. My question is, would you be able to do the same kind of "surgery" in SMD chips? Would the hot air rework station work for that matter? Thanks and keep up the good content! Cheers

@LeoMakes 5 лет назад

Thanks for the kind words! I'm not 100% sure you mean. You can use hot air to remove most SMD/SMT components (ICs, resistors, capacitors, etc.) I say "most" because some components (like LCD/LED screens, plastic jacks, buttons, etc.) may not like too much heat. Thermal information is usually listed in the product's datasheet so look there if you're not sure. Hope this helps and thanks for watching!

@Barefoot_Joe 5 лет назад

I'll say thanks for fherr or whoever else reads your reply, nice answer :) @@LeoMakes

@fherr170 5 лет назад

@@LeoMakes my apologies for the not so good explanation. However, you answered it! Once removed and swapped, would you be able to solder/reflow new SMD with the hot air?

@LeoMakes 5 лет назад

@@fherr170 No worries at all. Yes, it's possible to use hot air to solder a new part onto a PCB but you have to use solder "paste" to do this (the regular roll of solder wouldn't work well here). Hope this helps.

@earx23 3 года назад

The fume extractor looks wildly confused.

@MSM5500 5 лет назад

It's quite strange that you didn't do any sort of diagnostics prior to put a soldering iron on such as measuring voltages on power rails related to that part of the circuit as well as checking input/output signals on the suspected IC in respect to its datasheet. Yes, sure that's probably common fault for this particular piece of gear the manufacturer is aware of so that's why they come up with the solution straight away.

@LeoMakes 5 лет назад

I did poke around with the multimeter and oscilloscope but I didn't find anything interesting and the video was getting super long, so unfortunately cuts had to made. I hope I can find an interesting repair project where I can go deeper into troubleshooting. Thanks for watching (and your comment!)

@MSM5500 5 лет назад

@@LeoMakes, I don't think that long videos are a problem for viewers as anyone watching can scroll it forward just in one click to make the video as quick as they like. If you have a look at "Louise Rossman" channel you'll realise how long his videos and streams and at the same time he's got >750K subscribers by now. The thing is the audience watching this kind of videos want to learn something that's why I believe all the details are important IMHO.

@guysmiley7289 3 года назад

No disassemble.

@mattnsac 5 лет назад

Suprised you didnt use solder paste as you have a hot air station OR drag solder. Granted, the pitch isnt that bad on this, but you can drag solder IC with pitches 1/3 that in seconds.

@Barefoot_Joe 5 лет назад

I thought they are called 7 segment displays?

@squelchedotter 5 лет назад

7 segments, plus a dot makes 8 segments :)

@LeoMakes 5 лет назад

@@squelchedotter Correct. I've heard people call them both but the dot (which this one has) makes it 8 segments.

@Barefoot_Joe 5 лет назад

I know how many segments are there, I can count and I've been looking at them for over 40 years, but they are still called 7 segment displays pretty much everywhere AFAIK. en.wikipedia.org/wiki/Seven-segment_display

@Barefoot_Joe 5 лет назад

sorry to disagree, I love your content, I was just curious.. @@LeoMakes

@LeoMakes 5 лет назад

@@Barefoot_Joe No worries at all. I appreciate the wikipedia link--I'll take a look.

@desktorp 5 лет назад

5:13 Hail Satan

@LeoMakes 5 лет назад

I know right? I kept seeing that in the edit. I wonder if some engineer in China was having a laugh when writing the micro controller code!