A handy way to remove surface mount components like that which are dead anyway is to just take a razor and cut all the pins off the chip so you can take the chip itself off and just push the little bits of the pins off with a soldering iron. I believe I saw Dave from the EEVblog use that method.
Hot snot bonds really well to PLA, probably because it melts the surface of the PLA before it cools. It's really remarkable. I always thought of hot snot as a pretty bad solution to just about anything, but for PLA parts it might actually be one of the best.
I know this feeling - last year i was able to fix a 120$ oscillocope module (a TDS2CM) just by stupidly replacing the one IC that got hot, and it worked. On one hand you're extatic that you fixed it, on the other you feel like a complete hack for not being able to cleverly diagnose the issue...
"This is looking Sharp" no it's looking Roland lol. Also when you fast forward and talk, I get this feel of a commercials fine print and expect to hear at the end "terms and conditions apply"
Congrats on the successful QFP rework job, very glad to see you fashioned a heat shield to protect those white through hole connectors, I’ve learnt my lesson after melting a couple of them with hot air! I'm also surprised to see the processor failed low resistance, I've only encountered that once before (excluding gross overload failure modes) with a DSP with an internal regulator that had it's output shorted by a solder ball between two pins.
I think it only failed that way because it was a bad part to begin with. Not something that went bad over time. I'm glad it failed like that thought because it would not have been as easy to diagnose else wise.
Nice repair, it always feels good when it works out :) This video prompted me to look at used Sound Canvases (again...) and I found a nice SC-33. Can't wait to play with it.
That stuff looks relatively workable. I replaced a DAC on one of my synths as they're known to go bad. I removed a pad in the process and had to solder on a bodge wire. Not easy for a chip smaller than the thumbnail of your little finger.
Quick tip, next time you have to use hot air, raise the board off the workbench. That way you don't have to heat up the silicon mat and bench. But great video.
I would worry about the teflon giving off toxic gasses. I just use AL foil and cut out a square and then use Kapton tape. I also have a hot air machine with a underside preheater and that also helps. To put the chip back on I use solder wick to remove the extra solder and then I use tape to help align the part. I then tack the corner pins. I then tip the board up vertically and use a 1/2 inch wide double bevel tip pointing upwards to solder all the pins at the same time. Flux removes surface tension so all the solder bridge's drop out.
I don't think it's getting warm enough for that, you only need to start worrying upwards of 260°C, and specific heat capacity of epoxy and PTFE is pretty close. Obviously the CPU area was heated to 200°C but not much beyond that, as the heat was removed as soon as the chip started to budge. But yeah alu foil is a good call.
Oh ye of little faith... I had confidence in you the whole time :D I believe I've seen another UA-cam video where one of the easy ways to diagnose bad chips on some board that's not working is to either touch the chips and feel for one that's unusually hot, and/or look with an infrared camera for anything hot. Because shorts tend to generate a lot of heat.
You really shouldn't use hot air without a flux (I may recommend Alpha RMA-7), also the temperature was way too low. You really had a lot of luck, you didn't rip off any of the pads. Never try to pull up the chip, it should start to flow first, and you should be able to move it aside, prior to pulling it up.
I repaired many Roland cutters and the main board design style was so similar. Maybe it was one team of engineers or just Japanese style as Roland DG has split from original Roland company already. Main Boards even used the same CPU.
Whoever is reading this, we need to get Tech Tangents’ attention. He has a legendary game. In his Gateway video, the first disc in the software pack was the legendary game that I’m speaking of. It is known as “The Neverhood Chronicles”.
Heh, I rework QFPs with 100 pins on a nearly daily basis with a soldering iron. Of course, I do have a very high end Metcal soldering station and a scope with like 14X zoom…
this rules. im kinda envious and want one, but i also dont have a super huge attachment to the soundcanvas, and i’d probably just get an sc-55 and use a keyboard controller, because i have a keyboard controller and buying the module would be cheaper and easier. this is still a really nice and unique synth though!
That's a 256kbit SRAM. It also has a twin and a CR2032 battery holder besides it. So that's what stores your configuration or whatever when it's unpowered, all the "nonvolatile" state. So the custom user patches, your FX route, modified patches.
It isn't at all surprising that you fixed the keyboard by swapping out a single part that got hot. This is a standard way to locate failed components on boards. This can be done by using an IR camera, but if you go look at the Louis Rossmann chanel, he often just squirts some IPA on the suspect area and sees what boils it off fastest. He can often get down to a single SMT capacitor (a rather common point of failure on some Apple notebook boards). (Not doing it by touch is usually preferable, as failed components can get dangerously hot to touch in some cases.)
I know what you meant by IPA, but for some reason I got the brief image of Rossman pouring beer over the board and watching it boil while he finished off the rest.
I'm scared if I had to do soldering myself, but I'd poop my pants if I even have to think about doing DIY soldering of SMD components. My respects to anyone who can solder SMD components.
Nothing beats the feeling of “it’s fixed!!!”
Danny i think a collection of retro tech is just a shrine to times they made thinks work again
In all this you restored one SK-88 which had been damaged beyond practical use, and another which had quite possibly never, ever worked. Brilliant.
You had me at "Roland SC-88 Pro stuffed into a keyboard"
Now this is something I need in my life 😄
Great restoration too!
There's nothing like that feeling of accomplishment when you attempt a task and complete it with the intended outcome.
One of your best episodes in s long time range. I can just feel the passion you have while fix the issue and to it's awesome to watch.
the work you've done to repair this keyboard is amazing :)
i hope you get to 100k subs soon!
Those H8 CPUs are a common failure. Also used in the Yamaha SY series.
A handy way to remove surface mount components like that which are dead anyway is to just take a razor and cut all the pins off the chip so you can take the chip itself off and just push the little bits of the pins off with a soldering iron. I believe I saw Dave from the EEVblog use that method.
Impressed by your mechanical modelling - great work!
Mighty fine repair work. It's awesome when someone springs back to life after a critical part is swapped.
Nice repair. My one critique: I think I would have used epoxy instead of hot snot...
I like hot glue because it is more conveniant (at least for me), and it is much easier to clean up or fix mistakes, and usually is good enough.
Hot snot bonds really well to PLA, probably because it melts the surface of the PLA before it cools. It's really remarkable. I always thought of hot snot as a pretty bad solution to just about anything, but for PLA parts it might actually be one of the best.
@@Hagledesperado it needs to stick to both surface. Not just the PLA
Or even gel cyanoacrylate.
@@watchmakerful The brittleness of that would scare me on any keyboard. one sharp jolt in the wrong direction and itll snap right off.
Great video, the new bench makes the shots even better, looking forward to more videos.
Nice job I have a HDMI port on a PS4 to replace tomorrow, never done one before and watching you fills me with more confidence :)
Nice fix. Most impressed that you used OpenSCAD to design the hook.
You made such cute little dinosaurs! Glad to hear how it turned out. Also, your new setup is really nice!
I know this feeling - last year i was able to fix a 120$ oscillocope module (a TDS2CM) just by stupidly replacing the one IC that got hot, and it worked. On one hand you're extatic that you fixed it, on the other you feel like a complete hack for not being able to cleverly diagnose the issue...
Hey! Love the work bench! Lighting looks great for videos!
Adding flux to the braid is a sound technique as well. Just tossing that out.
Also it's a good idea to cut of the used part of the braid, else it becomes a heat sink, which is not what you need.
@@Hagledesperado This ^^^ especially for bga. and extra flux helps
"This is looking Sharp" no it's looking Roland lol. Also when you fast forward and talk, I get this feel of a commercials fine print and expect to hear at the end "terms and conditions apply"
Ah, the happiness in your voice when you saw that you'd fixed it. Brilliant. :)
Congrats on the successful QFP rework job, very glad to see you fashioned a heat shield to protect those white through hole connectors, I’ve learnt my lesson after melting a couple of them with hot air!
I'm also surprised to see the processor failed low resistance, I've only encountered that once before (excluding gross overload failure modes) with a DSP with an internal regulator that had it's output shorted by a solder ball between two pins.
I think it only failed that way because it was a bad part to begin with. Not something that went bad over time. I'm glad it failed like that thought because it would not have been as easy to diagnose else wise.
Amazing job Shelby!
That was pretty f'n sick dude and the little jam was rock'n too! Cheers!
Love your videos man, will download this with premium and listen while I walk.
Nice repair, it always feels good when it works out :)
This video prompted me to look at used Sound Canvases (again...) and I found a nice SC-33. Can't wait to play with it.
I would recommend getting a thinner tip solder iron for smaller pin pitch components
Awesome job. Great advertisement for the utility of a 3d printer too!
Skipped ahead to see if you had success. I can replace chips like that half asleep. Nice repair.
17:06 ... "cool down", maybe?
Great idea on the Teflon (PTFE) sheets as a cutout.
Al foil is great for masking sensitive components. It spreads the heat.
That stuff looks relatively workable. I replaced a DAC on one of my synths as they're known to go bad. I removed a pad in the process and had to solder on a bodge wire. Not easy for a chip smaller than the thumbnail of your little finger.
That little piece you played at the end sounded like the lead-in to a final boss theme.
Quick tip, next time you have to use hot air, raise the board off the workbench. That way you don't have to heat up the silicon mat and bench. But great video.
Keyboards yeah. Thanks for the work you do.
Loving the new setup and where it's taking your videos!
If you ever need springs for a keyboard, Harbor Freight sells a pack of springs, and some stores carry packs that are perfect replacements.
Cool. Nice job. Congratulations.
Glad you didn't throw the other one away. I hate it when people use donor machines. There are fewer and fewer vintage machines each year.
Good work on keys. Cheers
Nice, killer job
Amazing work! This was a really cool video.
I would worry about the teflon giving off toxic gasses. I just use AL foil and cut out a square and then use Kapton tape. I also have a hot air machine with a underside preheater and that also helps. To put the chip back on I use solder wick to remove the extra solder and then I use tape to help align the part. I then tack the corner pins. I then tip the board up vertically and use a 1/2 inch wide double bevel tip pointing upwards to solder all the pins at the same time. Flux removes surface tension so all the solder bridge's drop out.
I don't think it's getting warm enough for that, you only need to start worrying upwards of 260°C, and specific heat capacity of epoxy and PTFE is pretty close. Obviously the CPU area was heated to 200°C but not much beyond that, as the heat was removed as soon as the chip started to budge. But yeah alu foil is a good call.
Well done, fantastic repair! +1
Great repair
sick! glad it worked out
Oh ye of little faith... I had confidence in you the whole time :D
I believe I've seen another UA-cam video where one of the easy ways to diagnose bad chips on some board that's not working is to either touch the chips and feel for one that's unusually hot, and/or look with an infrared camera for anything hot. Because shorts tend to generate a lot of heat.
Check out the Syntaur channel... They are here in Texas repairing old synths
They even repaired a freakin CS-80, which is practically a 300lb box of 22 gauge wire nests and daughter boards upon daughter boards
You really shouldn't use hot air without a flux (I may recommend Alpha RMA-7), also the temperature was way too low. You really had a lot of luck, you didn't rip off any of the pads. Never try to pull up the chip, it should start to flow first, and you should be able to move it aside, prior to pulling it up.
It's a bit of pita without a sonic cleaner but the right flux will prevent and reverse oxidization that happens rapidly with heat.
Great stuff there fella!
I repaired many Roland cutters and the main board design style was so similar. Maybe it was one team of engineers or just Japanese style as Roland DG has split from original Roland company already. Main Boards even used the same CPU.
Saved another one. A+
Whoever is reading this, we need to get Tech Tangents’ attention. He has a legendary game. In his Gateway video, the first disc in the software pack was the legendary game that I’m speaking of. It is known as “The Neverhood Chronicles”.
Holy crap that's a big tip on that iron for doing SMD repairs O_O
Amazing work.
Keyboard is fixed, and it sounds like _Final DOOM._ Eat your heart out, *8-Bit Keys.* ^_^
Give this second keyboard to The 8-Bit Guy,because he likes musical keyboards and he does review it's specs.
I'm all about rework, but you could have just swapped boards dude lol. Love the channel!
Great job!!!
Well done 👍
Nice little trance riff 😎
Just to let you know, the audio for your intro is panned hard to the left. Otherwise, great vid!
Good video, though of course, the traditional test song for the fix of any MIDI product should always be "Stones" from the Ultima series...
Heh, I rework QFPs with 100 pins on a nearly daily basis with a soldering iron. Of course, I do have a very high end Metcal soldering station and a scope with like 14X zoom…
this rules. im kinda envious and want one, but i also dont have a super huge attachment to the soundcanvas, and i’d probably just get an sc-55 and use a keyboard controller, because i have a keyboard controller and buying the module would be cheaper and easier. this is still a really nice and unique synth though!
do you have a link to any of the music you produce? also cool to see the new workbench be put to use!
Nice repair! However I don't think I would have used hot glue. Super glue + bakingsoda will last longer.
You can even use super cheap aluminium tape as a heat shield for the rest of the PCB.
hell yeah man
throw that up on eBay with a link to the video and get your money back out of it
9:29 read that again but slowly
Nice, and you didn't even need to use a paperclip or a Dremel.
Can i ask if you are repairing roland organ/piano?
Sweet!
Dude, the 8 Bit Guy and Adrain's Digital Basement in one.. yes thanks for the vid!
Don't watch the 8bit guy one, you may regret it...
bro you did it
nice video,im not realy into instuments but its cool(the intro only sounds in the left chanel)
An smd soldering kit would help.
What do you mean 'kit', what should it contain?
If only you had 4 hands then you could always have 1 on the record button and the other as a macro. Lmao
Oh yeah
11:15 drag soldering is easy I swear
What does the Epson chip do?
That's a 256kbit SRAM. It also has a twin and a CR2032 battery holder besides it. So that's what stores your configuration or whatever when it's unpowered, all the "nonvolatile" state. So the custom user patches, your FX route, modified patches.
It isn't at all surprising that you fixed the keyboard by swapping out a single part that got hot. This is a standard way to locate failed components on boards. This can be done by using an IR camera, but if you go look at the Louis Rossmann chanel, he often just squirts some IPA on the suspect area and sees what boils it off fastest. He can often get down to a single SMT capacitor (a rather common point of failure on some Apple notebook boards). (Not doing it by touch is usually preferable, as failed components can get dangerously hot to touch in some cases.)
I know what you meant by IPA, but for some reason I got the brief image of Rossman pouring beer over the board and watching it boil while he finished off the rest.
Came from Twitter! Another view!
Teach me more, master.
🔥🔥🔥
It's looking Sharp? I thought it was a Roland!
Akbuku? Is that you?
I'm scared if I had to do soldering myself, but I'd poop my pants if I even have to think about doing DIY soldering of SMD components. My respects to anyone who can solder SMD components.
Depends on how small they are, 0402 are sketchy, 0201, i'm out, 0603 and bigger, no problem at all. QFP all day any day, not a problem.
You should have removed the battery when working on it as not to damage any components luckily you did not.
0:52 It seems to have been passed down from the predecessor organization of Japan's IPA.
9:31 In the comment is a typo "peice" instead of "piece".
Thanks David, very useful.
Pwede ba ako tumawag for inquiry
If you don't sell it, you'll never drop it down the stairs. If you do sell it, you will drop it down the stairs.
You will absolutely regret selling one of them. Be kind to your future self and keep both!
On 2021 My Request is 20th Anniversary Of Windows XP 20th Anniversary PC Build on August 24th 2021 as Marked 20th Anniversary of Windows XP.
I'd sell one of them. Unless you plan to play both of them at the same time, or form a band with them. :p
Just renewing my campaign to get the pronunciation of this changed to "Skatey-eight".
For flux sake!
I've had good luck using aluminum foil to block hot air.
Hot glue is going to be a problem.
Not really, unless someone cleans the keys with alcohol. Then pop it goes!
Welcome my nigga