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geekhack Projects => Making Stuff Together! => Topic started by: Chuan on Sun, 10 August 2014, 11:28:05

Title: Need Help: Left-hand of Ergodox is not working. HD pics.
Post by: Chuan on Sun, 10 August 2014, 11:28:05
I assembled my Ergodox(from Massdrop) yesterday and I found that my Left-Hand didn't work. (Right-Hand working perfect)

I am not a hardware guy so I don't know how to identify the problem.

I think it could be a TRSS connection problem so that I desoldered both TRSS and switch the position of them. It is still not working after all.

I have take some pictures. Is there something wrong with my soldering? What could be the problem? Is there any way I can identify the problem?

Thanks for all your help!!

TRSS Left Front
(https://dl.dropboxusercontent.com/u/58367953/Picture%20Source/20140810%20Ergodox/IMG_0564.JPG)
TRSS Left Back
(https://dl.dropboxusercontent.com/u/58367953/Picture%20Source/20140810%20Ergodox/IMG_0563.JPG)

TRSS Right Front
(https://dl.dropboxusercontent.com/u/58367953/Picture%20Source/20140810%20Ergodox/IMG_0567.JPG)
TRSS Right Back
(https://dl.dropboxusercontent.com/u/58367953/Picture%20Source/20140810%20Ergodox/IMG_0560.JPG)

Left-Hand Overview
(https://dl.dropboxusercontent.com/u/58367953/Picture%20Source/20140810%20Ergodox/IMG_0565.JPG)
Left-Hand Back Overview
(https://dl.dropboxusercontent.com/u/58367953/Picture%20Source/20140810%20Ergodox/IMG_0568.JPG)

Right-Hand Overview
(https://dl.dropboxusercontent.com/u/58367953/Picture%20Source/20140810%20Ergodox/IMG_0566.JPG)
Right-Hand Back Overview
(https://dl.dropboxusercontent.com/u/58367953/Picture%20Source/20140810%20Ergodox/IMG_0570.JPG)
Title: Re: Need Help: Left-hand of Ergodox is not working. HD pics.
Post by: Grendel on Sun, 10 August 2014, 15:06:55
Looks like the MCP23018 (http://www.digikey.com/product-detail/en/MCP23018-E%2FSP/MCP23018-E%2FSP-ND/1999505) is soldered in the wrong way round, the notched side of the chip needs to point towards the TRS connector. The easiest way to fix this is if you can source a replacement chip -- cut the old chip off (clip the pins close to the body), heat each pad, pull the pin and clean the hole w/ a sucker. Then solder in the new chip.
Title: Re: Need Help: Left-hand of Ergodox is not working. HD pics.
Post by: Chuan on Sun, 10 August 2014, 17:41:08
Quote from: Grendel on Sun, 10 August 2014, 15:06:55
Looks like the MCP23018 (http://www.digikey.com/product-detail/en/MCP23018-E%2FSP/MCP23018-E%2FSP-ND/1999505) is soldered in the wrong way round, the notched side of the chip needs to point towards the TRS connector. The easiest way to fix this is if you can source a replacement chip -- cut the old chip off (clip the pins close to the body), heat each pad, pull the pin and clean the hole w/ a sucker. Then solder in the new chip.

I found this error after I post this topic. I find it is very hard to unplot a multiple pins chip. I have order a MCP23018 from your link. Thanks for your help!!!
Title: Re: Need Help: Left-hand of Ergodox is not working. HD pics.
Post by: dorkvader on Sun, 10 August 2014, 20:48:50
I have a spare one I'm not planning to use that you can have if you want.
Title: Re: Need Help: Left-hand of Ergodox is not working. HD pics.
Post by: Chuan on Sun, 10 August 2014, 23:40:33
Quote from: dorkvader on Sun, 10 August 2014, 20:48:50
I have a spare one I'm not planning to use that you can have if you want.

I have already ordered.  Thanks anyway!