I’ve just tried midi through USB, it is also working 
Regards
So then, it seems we have a broken zynaptik …
Please, try it again and if it’s not working yet, i will send you a replacement ASAP.
When you receive the replacement, please, send me the broken zynaptik by cheap “standard postal service”, so i can figure where the problem is.
Cheers!
OK thanks, I will check this this evening and will come back with the status.
Regards
Hi @jofemodo,
I tried again to connect the Zynaptik board, but nothing to do, the board is not starting at all. No led is lightning, seems to create a short circuit.
Sure I can send you the board back. How do you want to proceed with the details ? Per private mail ? Or we continue here ?
Thanks !
Regards
does running 12cdetect -y 1 on the zynthian reveal ports occupied?
Hi
All is working correctly when the Zynaptik board is disconnected ! With the Zynaptik board connected the rapsberry doesn’t start at all !!
Regards
Is the MCP 23017 in a socket?
No, it’s directly soldered.
I’ve taken a picture of the chip, it seems that some pins (near C4) are soldered together. Is that wanted ?
Regards
looks like pins 16,17,18 are shorted. THis could be the problem.
From the schematic pin 18 is the reset pin and is connected to +5V whilst pins 16 and 17 are both used in the Address selection and should both be tied to 0V
That bridge is going to put a dead short on the +5V line which is not good news. Unless of course things have changed but that would be an explanation.
1 Like
Yes, that seems to be the explanation.
I’m able to solder conventionnal componants, but not SMDs 
@jofemodo proposed to replace the board (I would return mine also).
What’s the best thing to do ?
Regards
The analysis seems right. Brave @guys!!
@fschenckel, you could try to remove the tin excess with a solder iron and cupper-mesh. Anyway, if you don’t feel comfortable doing it, i will send you a replacement and kindly ask you to send-back the faulty unit, so i can fix it.
Thanks!
Hi,
OK, it’s really small, but I will give it a try this week.
It cannot be worse I guess
Regards
Things can always get worse 
unless you believe Dr Brian Cox and his D:Ream cohort!
Did you fix it?
Hi,
Sorry no, I didn’t find the time by now. I will probably try this evening.
Regards
Good luck! A solder sucker generally works wonders!
Huuuh, too bad, I moved for 2 years ago and while I could find my soldering iron, I’m not able to find nor the solder sucker nor the cupper mesh I had 
A deft flick with the soldering iron can achieve miracles, or failing that a bit of aerial cable braid can work effectively as a copper braid ( if it’s copper)
Have you anyway of checking that there is no longer a short circuit?
Hi @fschenckel !
Could you fix it?
If not, i would send you a replacement. No problem at all.
Regards,
Hi,
Sorry I was busy with other things. I tried, but I couldn’t manage to remove the solder excess between pin 2/3 and 4.
I’ve seen you sent me a new card ? Thanks a lot !!!
Give me an address where I can send my card back to you.
Thanks a lot !
Regards