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geekhack Community => Keyboards => Topic started by: weenis on Sat, 31 December 2011, 13:27:32

Title: Picture Request
Post by: weenis on Sat, 31 December 2011, 13:27:32

Can someone open up their Noppoo Choc Mini and take a very close up picture of the 2 transistors closest to the cord connection on the circuit board?

Thanks in advance.

I blew mine up.  :(

Title: Picture Request
Post by: weenis on Sat, 31 December 2011, 13:57:15

Found one...

[ATTACH=CONFIG]36347[/ATTACH]

Title: Picture Request
Post by: weenis on Sat, 31 December 2011, 14:31:34

You're a terrible person. Buy me a drink as consolation.

Title: Picture Request
Post by: weenis on Sat, 31 December 2011, 14:36:13

Here are the pictures of my stupid catastrophe...

[ATTACH=CONFIG]36349[/ATTACH]

[ATTACH=CONFIG]36350[/ATTACH]

[ATTACH=CONFIG]36351[/ATTACH]

I should have tested that stupid cable before plugging it in.

Title: Picture Request
Post by: weenis on Sat, 31 December 2011, 15:58:12

Pffffffffffff... yeah, happy New Year.

Title: Picture Request
Post by: cathode on Sat, 31 December 2011, 16:16:43

Looks like 0.1uF and 10uF SMT capacitors, hard to tell what type though. Just make sure the voltage rating on the ones you buy to replace is sufficient. i can't imagine that you'd need ones rated for more than 10VDC...

Title: Picture Request
Post by: weenis on Sat, 31 December 2011, 16:28:11

Do you think that would fix it?

Title: Picture Request
Post by: cathode on Sat, 31 December 2011, 16:31:15

It would be cheaper than buying a new keyboard. You probably dont even need to replace them with surface mount ones, assuming you have enough room to fit a larger part in there.

Title: Picture Request
Post by: weenis on Sat, 31 December 2011, 16:38:47

I have enough room. I'm headed to Fry's Electronics right now to pick up the parts.

My only fear is that where it exploded, the board is kind of bubbled out, like it has a welt.

Title: Picture Request
Post by: sordna on Sat, 31 December 2011, 18:21:36

Quote from: weenis;481047

I blew mine up.  :(

How did you manage to do that?

Title: Picture Request
Post by: weenis on Sat, 31 December 2011, 18:25:33

I modded mine for a detachable USB cable. The USB cable that I used isn't a standard cable, so i went online, got wire diagram, and made a wire.

All worked just fine.

I wanted "professional" cables, so I found some of the USB cables that I required, and ordered some.

Well, the cable I made, with the schematics I had on hand, was a cross-over of sorts. So, A went to D, B went to C, C went to B, and D went to A. The cable I got in the mail was a straight through, A went to A, B went to B, C went to C, and D went to D.

I plugged it in, and it didn't work. I thought that was weird, left it plugged in and grabbed the other cable and my multimeter so I could trace the USB, I realized it was reversed. When I  went back to my keyboard, I smelled burnt electronics, and knew I let the smoke out.

Title: Picture Request
Post by: DaemonRaccoon on Sat, 31 December 2011, 18:29:35

Quote from: weenis;481128

I have enough room. I'm headed to Fry's Electronics right now to pick up the parts.

My only fear is that where it exploded, the board is kind of bubbled out, like it has a welt.

That's not good, if it delaminated, the board is toast.

Title: Picture Request
Post by: sordna on Sat, 31 December 2011, 18:29:44

Whoops, let's hope the controller has survived!

Title: Picture Request
Post by: DaemonRaccoon on Sat, 31 December 2011, 18:31:38

If the controller still works then some fancy wire-work might be able to get the board to a serviceable condition.

Title: Picture Request
Post by: weenis on Sat, 31 December 2011, 18:32:26

Quote from: DaemonRaccoon;481185

That's not good, if it delaminated, the board is toast.

I think this is what happened, because even with the new capacitor, I just get blue lights.

There is a noticeable bubble, if it is delamination, can this be a possible solution?- http://www.circuitrework.com/guides/3-1.shtml

Title: Picture Request
Post by: DaemonRaccoon on Sat, 31 December 2011, 18:49:10

If you have the necessary tools and patience to do so, that looks to be a good guide.