Commodore VIC-20 Repair-a-thon

Рет қаралды 31,638

8 ай бұрын

Today I attempt to fix the first vintage computer I ever bought for my collection!
Here are some ways to help me make more videos!
Buy some Merch:
Merch: tech-tangents.creator-spring....
Leave a one time tip:
Paypal one-time: paypal.me/AkBKukU
Ko-fi: ko-fi.com/techtangents
Amazon Wishlist for Production Gear:
www.amazon.com/hz/wishlist/ls...
Become a monthly supporter:
Patreon: / akbkuku
KZfaq Membership: / @techtangents
Paypal Monthly: techtangents.net/support/
Other Links
KZfaq: / akbkuku
Twitch: / techtangents
Github: github.com/AkBKukU
Thingiverse: www.thingiverse.com/AkBKukU
Discord: / discord

Пікірлер: 142

@PrinsessePeach 8 ай бұрын

Adrian’s Digital Basement is the king of VIC20 and C64 computers! 🤓

@bozimmerman 8 ай бұрын

If you have a dead VIC-20 or C64, do not feel like you have to tackle it alone. Since the 1990s, there have been mailing lists, news groups, web forums, etc, etc full of people who are happy to help.

@Dreadfultime 8 ай бұрын

Dude this guy is such an exceptional nerd. I screamed when the space bar was fixed. that was such an exciting moment.

@T3hBeowulf 8 ай бұрын

Having watched a bunch of Adrian's Black's videos demonstrating the diagnosis and repair of VIC-20 and C64s, the chances of a capacitor taking out these machines is empirically minimal. Commodore machines experience a silly number of failure modes but it's more often RAM, PLAs, VIC* chips and/or the CPU itself. TL;DR - capacitors are not usually the first thing to check. Of course, that said, you can rule out capacitors now! 😁

@TechTangents 8 ай бұрын

Well the caps were very definitely bad on it, they shouldn't be getting green and fuzzy lol. But that was clearly not the only issue with it. Until now though I didn't have a great way to test the custom ICs beyond spending tons of time staring at schematics and probing. So I was just going with what I knew was wrong at the start and hoping to figure it out now that I had more options.

@T3hBeowulf 8 ай бұрын

@@TechTangents Indeed, and it wasn't intended to be a criticism. I would have done the same; replace obviously bad caps, see what changed. It's a great video and I'm glad you got all three machines into known states.

@winstonsmith478 8 ай бұрын

Learned something new: very closely inspect any Ace brand electrolytics. Further confirmed something already known: MOS Technology ICs are CRAP, from what I've read due to too much boron in the passivation layer which leads to failures over time at least with 1983 dated chips - for any other years, maybe their manufacturing process or IC layout causing heat related issues was just generally crap.

@Doug_in_NC 8 ай бұрын

You don’t need the RF modulator, just plug the video out straight into a composite monitor and you should be fine. You may have to tweet the potentiometers under the RF shield to get the right colors though. The RF modulator amplifies the signal, so the composite signal is often set too low to directly drive a monitor very well.

@user-wj9xq7ig2v 8 ай бұрын

Yup din 5 connector even a cable from a model 1 genesis will do the job

@Doug_in_NC 8 ай бұрын

@@user-wj9xq7ig2v I didn’t know about the Genesis, but the VIC 20, TI99/4A and Atari 8 bit line all have the same video pinout.

@user-wj9xq7ig2v 8 ай бұрын

Yep they all work. Tg16 as well. The red wire might be your composite video or some random things like that. Nothing that can't be sorted out with a pinout diagram and a multimeter

@Ffinity 8 ай бұрын

@@Doug_in_NC Nope, the Atari 8-bit machines output Luma and Chroma, aka S-Video, the Vic does not. Edit: How many machines have you destroyed or written off as not working? Stop guessing and do some research!

@Doug_in_NC 8 ай бұрын

@@Ffinity All of the atari machines that split luma and chroma (many 800XL’s don’t) also internally combine them to output composite on a different pin on the connector so they can be either connected to s-video or composite monitors. Normally today you would buy a cable that has both the s-video connector and a composite one on it (I haven’t seen ones that don’t include the composite output, but maybe they exist) - the s-video takes luma from pin 1 and chroma from pin 5 on the Atari. The color composite output comes on pin 4. Pin 4 and 5 provide the video signal on a VIC and are coupled internally, so you would get composite output on pin 4, ie an Atari cable works when connected to composite video, though obviously not if you try to use it on s-video. If you don’t believe me, check out the composite cables that 8bitclassics.com (among many others) sell. They specifically state that their cable works with all Atari and Commodore machines and the TI99/4A (that only applies to NTSC TI99/4a’s, PAL ones don’t have composite). As Atari didn’t sell monitors for their 8 bit line, and s-video wasn’t really a standard until 1987, most people who used monitors with them would have used composite, as luma-chroma monitors didn’t really exist until Commodore released them for the C64. I use composite cables interchangably between VICs, Ataris and TI99s, and have not destroyed any computers or monitors in the process. Maybe next time you could consider communicating politely, there is no need whatsoever for rudeness.

@herdware 8 ай бұрын

No, RF is not the only way to get video out of a VIC-20. There is composite video out on the DIN connector. Also if you don't know about it Ray Carlsen has good tutorials on how to fix most Commodore 8-bit computers and disk drives. It's pretty easy to convert a 27XX EPROM to the 23XX masked ROM pinout. You can get adapters from many places if you don't want to make one yourself. There is also a pretty easy S-Video conversion you can do. The newer VIC-20 has the same power pinout as the Commodore 64.

@messyfool 8 ай бұрын

Have you ever been in the car listening to music and the song is just a banger . And about 3/4 of the way through you restart the song because you haven’t had enough of it yet and don’t want it to end ? I do that all the time with this guys videos . Nothing but bangers from Shelby . Keep it up man.

@TastyBusiness 8 ай бұрын

Never seen a BASIC ROM being bad, a dead KERNAL ROM is one of the most common VIC failures. I've had to install modern EEPROM adapters in a few of mine to get around that failure. I rarely fire up my RF modulators, usually opting for a composite cable instead. Glad to see a few VICs up and running!

@TechTangents 8 ай бұрын

I'm probably going to stick with RF for mine because I try to go for the setup that feels like it would have been more common. But also because I have a very particular TV in mind I've been trying to get to go with one of these. It also seems like composite is kind of an after thought? It's a the port pinout for it is kind of weird. I'll definitely be exploring the modern EEPROM option, I would have thought the failures would be typical for both since they're probably similar parts, odd. And thanks! This was a huge relief for me to get working!

@G_Fresh_UK 8 ай бұрын

Love the emotion, I know how satisfying it can be to fix something. (Engineer of Amusement Machines for 25+ Years)

@Yarrs 8 ай бұрын

You could burn the character ROM to a 27C64 EEPROM and use a 2364 to 27XXX EEPROM adapter to install it in the socket. I had to do that after my kernel ROM failed in my VIC20.

@root42 8 ай бұрын

Same here but with the BASIC ROM. Brought my old style VC20 back to life.

@WesleyNixon 8 ай бұрын

Been looking forward to seeing this. Thanks for the shout out. Oh, and nice tease there :)

@faealiciadotsys 8 ай бұрын

I never had a Commodore growing up, but I did have a TRS-80 CoCo Model 1 and Model 3. Dual 5.25" floppy drives, cassette drive, dual joysticks, and even a Dungeons of Daggorath ROM cart. My first computer repair was done on the second 5.25" drive. At age 8, I opened it up and reconnected a loose connection, and was able to have proper dual floppy drive functionality afterwards. Suffice it to say, I'm eextremely interested in seeing more of this. I've seen your video about reverse engineering that CD-ROM controller card using only pictures. I also did a quick search to see just how far the community has come with the VIC 20 and recreating a working VIC chip replacement from scratch. They're pretty far along, judging by just the one forum thread I looked at. With a little work, I'm sure the rest can be figured out and brand new third party VIC chips made available to the masses. With all the stuff you've learned over the years, as well as such a dedicated community available to work with, I have faith you all can make it happen. Best of luck, and I look forward to a part two where by the end, you finally own two working VIC 20 computers.

@samuraidriver4x4 8 ай бұрын

Using bigger heatsinks does help a bit when it comes to total thermal mass. Takes longer for the die to heat up as it sucks the heat to the ends of the heatsink.

@nickwallette6201 8 ай бұрын

Yeah. Consider the early Socket 370 P-III CPUs, for example. Or the Athlon XP. Tiny die, huge heatsink. Not because it needed the contact area...

@MD_Builds 8 ай бұрын

That square "chip" you screwed through is a bridge rectifier.

@scottbarrie1279 8 ай бұрын

Just started watching and my man is already up to a VIC-60. This is going to be great.

@BCZF 8 ай бұрын

Ahh Vic-20 my first computer, bought it new from KMart, I believe. This makes me smile.

@CoalTen59 8 ай бұрын

Just last week I replaced a bunch of leaky ACE brand caps in a cassette deck from 1982. Not all of the ACE caps had failed, however. Only the 47uF10v and 10uF16v caps (only some had obviously failed before desoldering, but upon removing them from the board I discovered they were all corroded). I replaced a few other values of ACE caps on the board out of precaution, but they showed no corrosion.

@Daveyk021 8 ай бұрын

Excellent job on the 3D printing of the space bar mount. I would suggest putting your model on Thingiverse where it can more easily found. I like the idea of resin printing, but the toxic part of it is kind of scary. I do have a Bambu X1-Carbon that is fairly good at small parts but not nearly as good as a resin printer at small parts. Supports are the difficult part.

@kaitlyn__L 7 ай бұрын

Heck yeah, resin printers. I've always thought they were cooler than filament deposition. Both for functional parts with highly precise dimensions, but also for paintable models of unique characters! Both ends of the creative/technical spectrum! They're cheap enough that I've been considering getting a small one of my own lately.

@wimwiddershins 8 ай бұрын

Theres some pretty impressive homebrew out there for the Vic20. Happy exploring.👍

@Breakfast_of_Champions 8 ай бұрын

Modern homebrew and the classic arcade conversions from back in the day are high quality.

@jakublulek3261 8 ай бұрын

Frankly, maybe the only thing I miss from this era of computing is ease of repairability. Everything is through-hole, big chips are (mostly) socketed, diagnostics are clear and not that hard. I am more IBM PC nerd than Commodore but the same thing applies there, you can make sense of things from block diagrams and schematics, plus parts are easy to obtain (NOS or repros, and most chips on IBM PC are still being made). I used to repair laptops and just let that business go couple years ago because it is not worth the hassle.

@Colaholiker 8 ай бұрын

9:31 "Whatever that is"... That looks like a FUULL BRIDGE RECTIFIAH!, as ElectroBOOM would say.

@angrydove4067 8 ай бұрын

Shelby, I can't believe you installed a couple of those heat sinks crooked. How will you sleep at night?

@jamesdecross1035 8 ай бұрын

I’ve got two of those early 9v AC VIC20s. I’ve heard they are more robust than the CR revision. Also, I find they do take several seconds to fire up.

@Doug_in_NC 8 ай бұрын

They are, but they run really hot because of the internal voltage regulator. Heat sinks or a modern voltage regulator are a must.

@jamesdecross1035 7 ай бұрын

@@Doug_in_NC Not sure you can get a voltage regulator for the 9vAC version.

@SamaelDionysus 8 ай бұрын

I like how this era of computers has more space occupied on the board than some from FAR more recent computers

@No-mq5lw 8 ай бұрын

The entirety of computing history is very much themed with making everything computer more integrated, smaller, and better. The VIC-20 vs a 1950's era vacuum tube mainframe? No contest which one is busier.

@stephenwalters9891 8 ай бұрын

You can replace that big LM323K voltage regulator with a modern, switch-mode equivalent which runs a lot cooler. ( EZSBC PSU5 LM323K Replacement 5V 3A switch-mode voltage regulator, high-efficiency replacement for the obsolete LM323K. 20V Maximum Input)

@andresbravo2003 8 ай бұрын

Sweet mother of VIC-20!

@cliftonchurch6039 8 ай бұрын

Did I catch a OLPC laptop when introducing the third VIC-20?

@thenoblerot 8 ай бұрын

Yep.

@jeromethiel4323 8 ай бұрын

Dude, just saying people love watching more in depth repairs. Component level troubleshooting is just more entertaining and more educational (at least to me). But i am not the boss of you, you do your videos however you like. ^-^ Just a little input, take it for what it's worth.

@KAPTKipper 8 ай бұрын

MOS logic is the prime culprit in any Commodore 8-bit. MOS made absolute crap 74XX logic chips. BTW you don't need the RF modulator, the VIC outputs a composite signal, Atari 5 pin cable will work.

@Ffinity 8 ай бұрын

I've never had any component problems with a CBM 8-bit, not my original Vic or the multiple C64's and 128's I have or have had.

@root42 8 ай бұрын

Mrdoornbos over on Mastodon is developing a replacement for the VIC chip. It's pretty far along in development from what I can tell, but not quite there yet. So hopefully in the future we will have something akin to the Kawari for the Vic20.

@ReedsRedactions 8 ай бұрын

What a great video! Thanks for posting!

@JORGETECHJorge 8 ай бұрын

After watching several Commodore repair videos (mostly from Adrian's Digital Basement) I've been wondering about the reliability issues of MOS Technology branded chips. Are they more sensitive to heat or is it just bad manufacturing?

@timmooney7528 8 ай бұрын

I heard bad manufacturing. Some batches of IC's suffered from contamination during the photo etching process.

@poofygoof 8 ай бұрын

Yup, MOS was quality(?) US manufacturing from Pennsylvania. I'm sure they had some good production runs, but it's a good thing for retrocomputing that their products were produced at other fabs or had functional equivalents made by other companies.

@bblevins 8 ай бұрын

Love the absolute JOY at 16:16. 👏👏👏

@coburn_karma 8 ай бұрын

My first computer as a 13 yr old back in 1983. Purchased used from my friend Tai Morris in Houston TX.

@ScratchedWinter 8 ай бұрын

my first computer, i still own one. I got mine in about 87 i think, it was a bit outdated by then but i was 6 or 7 yrs old so it was fine

@TiberianFiend 8 ай бұрын

You should talk to the guys on the Vintage Computer Forums if you ever hit a roadblock when fixing things like these. Those guys are crack experts.

@larswadefalk6423 8 ай бұрын

Randyrossi should develop a VIC I kawari as well, then we'd have replacements for both the vic 20 and cbm 64.

@jeromethiel4323 8 ай бұрын

Just a note. While the die is just a small square in the center, like you said, a larger heat sink means more surface area. Just because the die is only under the middle part, the aluminum will conduct the heat to the areas of the heat sink not in contact with the parts of the chip that get extra hot. In short, a bigger heat sink can help. Probably not necessary, due to the fact that the original design didn't include heat sinks at all, but it would not hurt either.

@dronenb 8 ай бұрын

I would love to see you Retrobrite the case on your VIC’s

@Ffinity 8 ай бұрын

You DON'T need the RF modulator to get video out, you can use the native composite output.

@maxtornogood 8 ай бұрын

A Commodore Repair-a-thon video that actually isn't from Adrian Black, hah!

@810PRODUCTIONS 8 ай бұрын

02:59 - He picks up the TV only to set it back down again for the sake of the intro. I hope he intentionally did not remove the pick up when editing the video as it is quite funny.

@jamesdecross1035 7 ай бұрын

Nice when it "just works".

@sgttibbz297 2 ай бұрын

"The first vintage computer I bought... as a vintage computer" dude straight up admitting he's a vintage computer himself

@timmooney7528 8 ай бұрын

Differences in power bricks didn't stop with the Vic-20. The C-64 had a some differing designs.

@ahmedgamer8065 8 ай бұрын

The bad ROM in the VIC-20 is the kernel ROM not the BASIC ROM without the kernel ROM the computer can't boot because the kernel ROM is on the top of the memory space, after the 6502 CPU reset it goes to address FFFC and FFFD for the address to jump to which address the CPU will jump to is at the start of the kernel ROM.

@Okurka. 8 ай бұрын

The bad IC is at UE11 and that's the BASIC ROM.

@landspide 8 ай бұрын

OpenSCAD Skillzzzzz!

@dan3a 8 ай бұрын

I wonder who's the most masochistic between an OpenSCAD and a FreeCAD user lol!

@SonicBoone56 8 ай бұрын

A lot of the chips on the VIC-20 and C64 have brand new replacement versions readily available and some FPGA versions for custom ICs. Definitely don't have to consolidate parts anymore.

@unikron2003 8 ай бұрын

I hope you are able to find a replacement VIC chip. At least an NTSC one. PAL versions seem to still be plentiful. In fact you can build a brand new VIC20 and order everything online. But unfortunately I doubt you will be able to find a NTSC vic chip anywhere except by cannibalizing existing vic20s. I have decided to go the PAL route for my VIC20s. So my only working vic20 is PAL based. Which also means I cannot connect it to a regular TV and must use something like a RCA > HDMI or something similar that can handle the PAL video. Since the 6560/6551 have board changes that separate them, I am usure if it is practical to swap a NTSC vic with a PAL one without many modifications.

@furroy 8 ай бұрын

nice! i just got mine working too and making an rpg game for it

@bugstomper4670 8 ай бұрын

I used to own a VIC-20, and was amazed with Sargon 4, chess. Also liked Pac-Man. Had a cartridge in it, that also turned the screen to 40 or 80 column text.

@poofygoof 8 ай бұрын

VIC20 was only 22 columns?

@eddiehimself 8 ай бұрын

While you're right that the die is only in the middle part of the chip, having a bigger heatsink does increase its thermal performance because there's more surface area for the heat to actually spread and dissipate. That's why you see computers like the Compaq PCs from the mid-late 1990s with their huge heatsinks on the CPUs because they didn't want to use a fan.

@TechTangents 8 ай бұрын

Mostly I was trying to advise against sticking more small heatsinks on because they wouldn't do much if they aren't directly attached to the center with the die. I could have phrased that better.

@enigma776 8 ай бұрын

Ah Commodore and their custom chips, only gets worse from here on out, the C64, the TED machines and god help you once you reach the Amiga's (especially those REV 4 2000s)

@Doug_in_NC 8 ай бұрын

The good thing with the VIC vs the C64 is that plug in replacement modern cmos variants of the 6502 and the 6522 VIAs are still made. It’s only the VIC and the RAM that requires old stock.

@Ffinity 8 ай бұрын

What utter nonsense, you clearly know the square-root of f**k-all about those machines!

@YOURTECHFRIEND 8 ай бұрын

Congrats! :-)

@LanceHall 8 ай бұрын

Coolies!

@infinitecanadian 8 ай бұрын

37:01 What is that black thing clamped near the right-hand end of the table?

@douglasgammill1842 8 ай бұрын

You should have put a little epoxy around the outside on those heat sinks.. Just to keep them from falling off in the future.

@michaelblair5566 8 ай бұрын

My first computer was a VIC 20 from 1983.

@xXfzmusicXx 8 ай бұрын

What is that desoldering gun you're using? I've used a few, but they all make a loud "BRRRR" when using them, would love one that was more silent like yours.

@Okurka. 8 ай бұрын

According to his "The Tools I Use" video it's a Metcal MX-DS1 hand-piece that's attached to a loud air compressor.

@simontay4851 8 ай бұрын

You will never find a desoldering gun that is silent. No such thing as a silent vacuum pump.

@xXfzmusicXx 8 ай бұрын

@@simontay4851 I mean that's why I'm asking. The one he used wasn't making any noise, but as the other comment said it seems t be hooked up to a compressor, so that makes sense

@The_Traveling_Clown 8 ай бұрын

It came from a goodwill? I thought they didn't sell computers anymore. Maybe they sold it as a keyboard?

@TeraByte38 3 ай бұрын

MOS chips are chips made directly by Commodore

@markdjdeenix6846 8 ай бұрын

i want to say the basic rom could be programed i think the tl866 cant work on 9 volt eproms im not sure if the basic rom needs that voltage .But there is a vic chip replacement again not sure if it works on the vic 20, its working on the c64

@Doug_in_NC 8 ай бұрын

The Kawari is a replacement for the VIC-II in the C64, and doesn’t work on the VIC-20. There is a board in prototype though, so hopefully we will be able to get it soon.

@markdjdeenix6846 8 ай бұрын

@@Doug_in_NC cool

@markdjdeenix6846 8 ай бұрын

Thanks do you know about the rom voltage?

@Daveyk021 8 ай бұрын

I assume you are just playing the "I don't know anything" part for the video?

@ProBreakers 7 ай бұрын

How much more life do the original chips in these machines have? At some point won’t they all die?

@Piero71 8 ай бұрын

¿is there a Data General terminal on the right?

@SonicBoone56 8 ай бұрын

God I'd love to see you or anybody with PCB design experience to look at the Intellivision and ColecoVision. The power supply in both are crap and the boards themselves have failures that frankly have hit or miss documentation.

@VaterOrlaag 8 ай бұрын

VIC-20... that was the computer with a real computer keyboard, right?

@soundspark 8 ай бұрын

My 6560-101 (NTSC model) is blown, any leads on a replacement?

@Doug_in_NC 8 ай бұрын

Right now E Bay is about your only option. There isn’t an FPGA replacement quite yet.

@MikeSharpeWriter 8 ай бұрын

For some reason, I feel like I'm missing an Anders Enger Jensen sound track..

@infinitecanadian 8 ай бұрын

I'm glad you aren't into consolidating units. That's more than can be said for other KZfaqr's like Adrian Black or RetroManCave.

@radman999 8 ай бұрын

Best thing you can do with those original power supplies is huck them straight in the dumpster

@TechTangents 8 ай бұрын

The A/C only versions that are the ones I have are basically bullet proof because they are just a transformer inside. It would take something going catastrophically wrong elsewhere to damage one of those. The one with the 5VDC regulator inside I did recommend the other person replace though.

@radman999 8 ай бұрын

@@TechTangents Makes sense!

@waterup380 8 ай бұрын

the screen tales the story when you plug it in and it shows you whatever patten it generates is the problem for one

@infinitecanadian 8 ай бұрын

29:52 You meant 'ripe', not 'rife'.

@FuccoTheClown 8 ай бұрын

maybe hit up the 8-bit guy to see if he's got some tips or parts. I'm sure he'd love that stabilizer model

@Okurka. 8 ай бұрын

9:30 That's a FULL wave BRIDGE RECTIFIER.

@livinincalifornia 8 ай бұрын

Yesss commmrraddee let's take over the woorld!!

@robgeib1723 8 ай бұрын

moar vics Please.

@tjtarget2690 8 ай бұрын

Notification Squad! :D

@mikewifak 8 ай бұрын

I saw the title and instantly knew the digital basement army was coming for the comments. 🤣 Sup, Adrian?

@PJBonoVox 5 ай бұрын

Cliquey bunch that they are.

@gsestream 8 ай бұрын

you got e-vic-ted, cheers

@marksmith9566 8 ай бұрын

You may want to contact Adrian's Basement about character ROM. I don't know of a replacement VIC chip and many have been harvested for failing C64s 😞

@Okurka. 8 ай бұрын

"I don't know of a replacement VIC chip and many have been harvested for failing C64s " The C64 uses a VIC-II chip that's entirely different.

@JohnSmith-xq1pz 8 ай бұрын

Wait this isn't Retro Recipes...

@HrLBolle 8 ай бұрын

or The 8-Bit Guy

@JohnSmith-xq1pz 8 ай бұрын

@@HrLBolle lol

@HrLBolle 8 ай бұрын

@@JohnSmith-xq1pz I'm so sorry, I meant the 9-bit guy actually

@Okurka. 8 ай бұрын

No, this guy knows what he does.

@JohnSmith-xq1pz 8 ай бұрын

@@HrLBolle 🤣🤣🤣 I haven't heard that for awhile

@Battleb0rn 8 ай бұрын

Get ahold of Adrian and see if he has any replacement vic or rom chips.

@Minecraftman-kj3nn 8 ай бұрын

you can call this "project ?"

@alertol 8 ай бұрын

They don't teach in US how to calculate angles? *facepalm*

@magicarmyman 8 ай бұрын

Remember kids, this computers name is a slur in germany

@Okurka. 8 ай бұрын

So is the Toyota MR2 in France.

@LightTheUnicorn 8 ай бұрын

It got rebranded as the VC-20 in that market, that's what mine is badged as!

@JonTheGeek 6 ай бұрын

Man should've collalbed with the 8-Bit Guy

@PJBonoVox 5 ай бұрын

I'd prefer not.

@laserhawk64 8 ай бұрын

Shelby! (Ohai, I'm starhawk ;) ) Long time no watch... sorry, been feeling WAY cr*ppy lately. Lots going on, most of it not good. I saw a Plus/4 box in that video... can you reach out to me? I have a Plus/4 keeb I want to reuse, the rest of the system didn't make it (I PROMISE I'M NOT RASPI'ING A VINTAGE SYSTEM dear god in heaven some people do awful things and I am NOT one of them) but I'm missing literally TWO keyboard springs and they're weird. Nobody else I've asked can help... maybe you can?