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geekhack Community => Keyboards => Topic started by: AmitB on Fri, 13 June 2014, 07:43:12

Title: 7G, button doesn't work
Post by: AmitB on Fri, 13 June 2014, 07:43:12

Hey guys,  few weeks ago i've asked for some place to buy switches to my 7G, so I've did some iron-soldering and the button doesn't work.
Any ideas what's the cause?

Title: Re: 7G, button doesn't work
Post by: AmitB on Fri, 13 June 2014, 07:54:31

Here's some pics to make it clearer

Title: Re: 7G, button doesn't work
Post by: CPTBadAss on Fri, 13 June 2014, 08:20:39

I don't see any pictures :(

Title: Re: 7G, button doesn't work
Post by: AmitB on Fri, 13 June 2014, 08:30:58

 http://imgur.com/C29KDgd,G81e4sW,wlT9hwc
My bad

Title: Re: 7G, button doesn't work
Post by: CPTBadAss on Fri, 13 June 2014, 08:32:16

Can you take a picture of just the joint you soldered close up? It's impossible to see what your joint looks like from that angle.

Title: Re: 7G, button doesn't work
Post by: AmitB on Fri, 13 June 2014, 08:49:55

http://imgur.com/AmWREGn
I dont really know what you mean by Joint

Title: Re: 7G, button doesn't work
Post by: CPTBadAss on Fri, 13 June 2014, 08:50:50

Looks like you torched the pad and then tried to glob on solder to try and fix the connectivity. You can try reflowing that bubble and seeing if it fixes it. If not, you'll have to jump it to another switch. I have a few lifted pads on my Kingsaver which I managed to fix by just adding tons of solder like you tried. So there's a chance you don't need to jump it.

Title: Re: 7G, button doesn't work
Post by: AmitB on Fri, 13 June 2014, 08:51:40

What do you mean by jump to another swotch?

Title: Re: 7G, button doesn't work
Post by: CPTBadAss on Fri, 13 June 2014, 08:53:22

So like I said I messed up some of my Kingsaver's pads. A possible fix would be like this post from intelli78 (http://geekhack.org/index.php?topic=58776.msg1353612#msg1353612). See that red wire? That's referred to as jumping the switch.

(http://i.imgur.com/Q96lVMW.jpg)

You'll have to figure out where the traces line up or ask someone else who is more knowledgeable than I.

Title: Re: 7G, button doesn't work
Post by: AmitB on Fri, 13 June 2014, 09:19:41

Thanks dude

Title: Re: 7G, button doesn't work
Post by: CPTBadAss on Fri, 13 June 2014, 09:27:00

Just make sure to doublecheck and do more research 'cause this isn't my strong suit. I've always had a lot of backup when I went into PCB repairs.

Title: Re: 7G, button doesn't work
Post by: blackbox on Fri, 13 June 2014, 10:18:46

Here is a good read about soldering problems:

https://learn.adafruit.com/adafruit-guide-excellent-soldering/common-problems (https://learn.adafruit.com/adafruit-guide-excellent-soldering/common-problems)

Looks like you have an cold joint.

Title: Re: 7G, button doesn't work
Post by: AmitB on Fri, 13 June 2014, 10:59:20

Somehow I managed to get output of L few times,  gotta test it more

Title: Re: 7G, button doesn't work
Post by: tp4tissue on Fri, 13 June 2014, 12:26:38

Quote from: AmitB on Fri, 13 June 2014, 10:59:20

Somehow I managed to get output of L few times,  gotta test it more

since this is low precision stuff, no need to consider length of wire or resistance..

Bridge the fried solder point to ANY of the yellow dots i've marked..

If you could provide a Higher-Res (in focus) picture,  I can make sure those points are correct..


But.. it SHOULD be right as is..   (you need to dl the picture and ZOOM IN)

also.. try the Points  further away from the controller before you go direct.. 

This is so that you don't fry the solder points most nearest to controller, because in order to fix a fry there,   You may have to solder to the OTHER side   and that might be inconvenient..

[attach=1]

Title: Re: 7G, button doesn't work
Post by: AmitB on Fri, 13 June 2014, 15:56:37

I've managed to get my button to output  somehow...
any ideas which dots i need to connect?

Title: Re: 7G, button doesn't work
Post by: tp4tissue on Sat, 14 June 2014, 01:31:42

Quote from: AmitB on Fri, 13 June 2014, 15:56:37

I've managed to get my button to output  somehow...
any ideas which dots i need to connect?

if it's intermittent, that means the problem is not fixed..

you can solder to any of the dots I labeled in (Yellow)

I assume the one chared contact that's black is the one that's not making a good connection..

if that's not the one,   then just follow the trace of the other switch prong..



The Traces are JUST WIRES.. but flat..  don't think of them as this complicated thing that you can't move around...   

Title: Re: 7G, button doesn't work
Post by: AmitB on Sat, 14 June 2014, 02:17:31

I've managed to fix it ;] thanks all