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Two questions about Monochron
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Re: Two questions about Monochron

by adafruit_support_bill on Sat Aug 12, 2017 3:01 pm

You have the wrong resistor installed in R2'. It should be the 100 ohm (Brown, Black, Brown)

And you have the 100 ohm resistor installed in R10. That should be the 10K (Brown Black Orange)

You have the 100K installed in R1. R1 should be a 10K resistor (Brown Black Red).

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Re: Two questions about Monochron

by coinop29 on Sat Aug 12, 2017 3:51 pm

Ok I just made all of those changes to the board but I still don't have any signs of life..

The red LED won't light and the screen doesn't turn on when plugged in....

I had to solder R2' and R1 on the back of the board because the connections seemed better.

here are some pics.. any more ideas? maybe it's just a dead board?

jbc

Image

Image

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Re: Two questions about Monochron

by coinop29 on Mon Aug 14, 2017 7:07 am

Any ideas why it's not working? Right now I have a Monocron paperweight. :(

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Re: Two questions about Monochron

by adafruit_support_bill on Mon Aug 14, 2017 7:36 am

Now that the resistors are in the correct locations, please re-measure the voltages as before.

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Re: Two questions about Monochron

by coinop29 on Mon Aug 14, 2017 8:19 am

ok here's the latest readings.. pretty much the same as before - that's why i think it's a bad board

right middle .647
left middle 8.51

- jonah

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Re: Two questions about Monochron

by adafruit_support_bill on Mon Aug 14, 2017 10:40 am

If by 'bad' you mean damaged by the assembly errors, yes that is a possibility. At the very least it seems that the voltage regulator is not functioning.

Before proceeding we need to see the rest of the circuit. Please post a photo showing your soldering on the display.

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Re: Two questions about Monochron

by coinop29 on Mon Aug 14, 2017 11:51 am

Ok here's a shot of the back of the display.. Image

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Re: Two questions about Monochron

by adafruit_support_bill on Mon Aug 14, 2017 11:58 am

We need to see the soldering on the headers..

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Re: Two questions about Monochron

by coinop29 on Mon Aug 14, 2017 12:04 pm

ah sorry about that.. here's a pic of that.. They seem pretty solid Image

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Re: Two questions about Monochron

by adafruit_support_bill on Mon Aug 14, 2017 1:08 pm

OK. Nothing there that would cause a short circuit. We can try replacing the voltage regulator. If you contact support@adafruit.com with a link to this thread, we can send one out to you.

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Re: Two questions about Monochron

by coinop29 on Mon Aug 14, 2017 1:25 pm

ok thanks!

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Re: Two questions about Monochron

by coinop29 on Thu Aug 17, 2017 11:32 pm

Got the new regulator today, replaced the old one and it's working great! I kind of shattered the enclosure in the process of putting it together for so long, but at least the screen works now.... thanks for the debug!

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Re: Two questions about Monochron

by adafruit_support_bill on Fri Aug 18, 2017 5:55 am

Good to hear that it is working now. Too bad about the enclosure. Check this thread for lots of alternative enclosure ideas: viewtopic.php?f=41&t=14769

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Please be positive and constructive with your questions and comments.