Mini POV4

MiniPOV4 and previous versions

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adafruit_support_carter
 
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Re: Mini POV4

Post by adafruit_support_carter »

Some of your solder connections look like they could be under or cold soldered. Take a look at this:
https://learn.adafruit.com/adafruit-gui ... n-problems
and then try reflowing any connections that look like they might not be making good electrical contact.

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Re: Mini POV4

Post by adafruit_support_carter »

That really sounds like some sort of electrical connection problem. By pressing down you're somehow forcing the connection closed. But there could also be other connection issues that are not being solved by the pressing down. Are the photos you posted of the reworked soldering?

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Mkhalil2
 
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Re: Mini POV4

Post by Mkhalil2 »

No that was from the first time, the second time I resoldered all the components that looked like they needed resoldering

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Re: Mini POV4

Post by adafruit_support_carter »

Post photos of the new solder job.

Does it show up at all when you plug it in via a USB cable to your computer? As described here for uploading new images:
https://learn.adafruit.com/minipov4-diy ... oad-images

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Re: Mini POV4

Post by adafruit_support_carter »

Yep. It should. From the guide:
Wait three seconds for the MiniPOV to 'boot' and you'll see the red, green and blue LEDs light up in order. Then the LEDs will flicker white.
The LEDs are basic RGB LEDs, with each color (red, green, and blue) controlled by a separate signal. By seeing only red, it indicates the possibility of a signal issue with the other two colors. There are several solder points that could cause this. If you post a second photo of the current solder job I can try and see if any of those specific points look like they might still have an issue.

The idea with plugging it in with a USB cable is just to provide another check.

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Mkhalil2
 
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Re: Mini POV4

Post by Mkhalil2 »

Here is my updated solder now only one LED does not flash and the rest flash red on a repeated loop
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Re: Mini POV4

Post by adafruit_support_carter »

Hey, mbkhali, I'll check out your soldering when I get a chance to compare to the schematic. In the meantime, can you try plugging it in to your computer via a USB cable and see if it is recognized at all.

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Re: Mini POV4

Post by adafruit_support_carter »

Cool. It sounds like the chip is working and the USB connections are good. Give me a bit to take a look at your last photo and check it against the schematics and Ill get back to you.

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Mkhalil2
 
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Re: Mini POV4

Post by Mkhalil2 »

yes but it says usb device not recognized

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Re: Mini POV4

Post by adafruit2 »

hmm - i see a ton of shorted pins there, from solder being dragged
are you using rosin-core electronics solder? what iron are you using?

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Mkhalil2
 
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Re: Mini POV4

Post by Mkhalil2 »

I’m using Rosin Core solder

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adafruit2
 
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Re: Mini POV4

Post by adafruit2 »

what iron are you using?

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Re: Mini POV4

Post by adafruit_support_carter »

I've added an image below with some markups to help guide you.

The red circles indicate potential solder bridges, which you should check and try to fix. In particular, the ones labeled A and B relate to powering the individual color channels of the RGB LEDs. If these have shorts, then you will have issues seeing other colors. Anecdotally - it appears that the red channel is the only one without any solder bridge issues, which may explain why you are only seeing red.

The yellow circles and labels indicate the individual LED pins. The pins labeled 1, 2, and 3 should be common across all the LEDs. That is, all the Pin 1's are tied together, all the Pin 2's are tied together, and all the Pin 3's are tied together. You can test this with a multimeter to make sure they are soldered OK.
resolder_labeled.jpg
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Mkhalil2
 
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Re: Mini POV4

Post by Mkhalil2 »

So fix the solder bridges and should I just check the LEDs to make sure theyre working

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Re: Mini POV4

Post by adafruit_support_carter »

For now, just try and fix the solder bridges and see what effect it has on the LEDs.

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