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Forum Index : Microcontroller and PC projects : My PicoMite do not boot
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| borg Newbie  Joined: 09/12/2020 Location: PolandPosts: 12 |
I tested cut and plain new board from 5 pieces I got. All have the same problem. Games and Computers Museum https://gikme.pl/en RetroGaming Chanel https://retrogralnia.yt |
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TassyJim Guru  Joined: 07/08/2011 Location: AustraliaPosts: 6101 |
You have nothing to loose so you could sacrifice one board. Connect a high current power source to the board, between V+ and ground. Watch and see where the smoke comes from. If you are lucky, it might even blow the short out and leave the rest of the board intact. This method has been used successfully in a previous life. Jim VK7JH MMedit MMBasic Help |
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Turbo46 Guru Joined: 24/12/2017 Location: AustraliaPosts: 1611 |
That sounds like the fault finding method of a fellow I use to work with. If he couldn't find the fault in an electrical circuit, he would replace the fuse wire with a hefty copper wire and then look for what blew up.  Bill Keep safe. Live long and prosper. |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
I like that idea. I wish I'd thought of it!  Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| borg Newbie Joined: 09/12/2020 Location: PolandPosts: 12 |
I hasten to report that after switching to the new version of the board - everything works perfectly! Just had to buy a lot of new parts. Damn, sometimes parts are used that are really hard to find in Europe :P   But despite everything, I'm glad that my work/road has come to an end with the third soldering (including two on non-working PCBs). Now I'm just having fun. I think that you can make some 3D housing quickly. Games and Computers Museum https://gikme.pl/en RetroGaming Chanel https://retrogralnia.yt |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
Looks like it went together ok. :) Excellent! Which parts did yo have trouble obtaining? I usually try to suggest alternatives. I know the compact version of the VGA connector might be hard to find, but I thought everything else was ok. The VGA connector is easy, and relatively quick, to get from China. Are you going to put it in one of the little cases? Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| borg Newbie Joined: 09/12/2020 Location: PolandPosts: 12 |
In this version VGA Connector, Audio Connector and microsd connector. Maybe "hard to find is wrong phrase"... I can get them easy from Aliexpress - but with 20-30 days delivery. I had already VGA connectors from last try. But I had to order other form vendors with price 500%+ of normal... But I didn't want to wait another few weeks to finish the project. And it's done and I'm happy :D Games and Computers Museum https://gikme.pl/en RetroGaming Chanel https://retrogralnia.yt |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
I know the audio and microSD connectors are available from the big component distributors (RS, Farnell, Mouser etc.) but the postage may be expensive. Shipping is quick though. :) I like to keep a small stock of the AliExpress bits. Glad you like it. :) Have you any comments about the assembly or the manual? Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| borg Newbie Joined: 09/12/2020 Location: PolandPosts: 12 |
I bought last missing part from RS without no problems - except of price :P I found one "error", I think, in parts list: MCP1700 3V3 TO220 package - is no TO220 package (larger cubical one), it's TO92 (truncated cylinder). I had first one - and legs are to thick to fit is pcb holes. Games and Computers Museum https://gikme.pl/en RetroGaming Chanel https://retrogralnia.yt |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
Thanks, I'll fix that. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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