Dead Falcon resuscitation

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SteveBagley
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Re: Dead Falcon resuscitation

Postby SteveBagley » Sat Sep 08, 2018 2:02 pm

Just a thought, but you do have the jumper in place on the expansion port? I don’t think falcon's boot without it…

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Re: Dead Falcon resuscitation

Postby Gaiyan » Sat Sep 08, 2018 2:17 pm

dhedberg wrote:
Gaiyan wrote:
frank.lukas wrote:What about with the Test Cartridge and a Null Modem cable and a serial console (9600Baud8N1)on a PC or Mac ?

I actually have an ST for this. I've created a cart that contains an executable ram disk which, after warm reset, boots to the desktop with several utilities. One is a VT52 emulator that I use all the time to diagnose dead boards. It's pretty cool.

Ah, sounds useful! Would you consider sharing an image of this disk?


It's a bootable cartridge I created, not a disk. It's not useful as a disk as it's 128KB.
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frank.lukas
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Re: Dead Falcon resuscitation

Postby frank.lukas » Sat Sep 08, 2018 4:00 pm

Use the Atari Falcon Service Manual ...

diag1.png


diag2.png
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Re: Dead Falcon resuscitation

Postby mpattonm » Fri Sep 14, 2018 4:40 pm

Oh well... I have a board connected on the serial and as I expected, it outputs whole lot of nothing.

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dhedberg
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Re: Dead Falcon resuscitation

Postby dhedberg » Fri Sep 14, 2018 5:28 pm

Just to make sure, you didn't forget the RAM board?
Daniel, New Beat - http://newbeat.atari.org. Like demos? Have a look at our new Falcon030 demo MORE.

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Re: Dead Falcon resuscitation

Postby mpattonm » Sat Sep 15, 2018 7:55 am

No, I have not. I see Miro's adventure is getting famous :D
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Re: Dead Falcon resuscitation

Postby mpattonm » Sat Sep 15, 2018 7:57 am

I think I will do a Combel blind-swap and see if it help. I can not think of anything else now.

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Re: Dead Falcon resuscitation

Postby mpattonm » Sat Sep 15, 2018 6:28 pm

Its probably time to admit I have started to suffer from dementia and some form of blidness too. When I was first looking for any traces of what could actually be the root cause of all the multiple failures this board has, I did thorough inspection of it. First I gave it a bath in IPA and when it's got nice and shiny, I inspected every singe component and visible trace under the 6x magnifying desktop glass. Except for all the missing components, that were taken off cleanly, I found no trace of visual damage. Nothing that would give a clue of how/why the board died.
I am saying this because in 90% of all cases it fails from obvious reasons, most common one is somebody has been toying with new soldering iron. Second place takes failures from mechanical damage caused by improper handling.
So I found nothing apparent, that is untill today. Because only today I have realized, that what I have been thinking is a medium case of DSP connector corrosion is in fact a true welding burn mark, caused from obviously high current electric arc. So thats how the board died - electrocuted! :)
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Re: Dead Falcon resuscitation

Postby mpattonm » Sat Sep 15, 2018 6:41 pm

So this led me to check some more components, namely few logic ICs and... I got a CPU, COMBEL and VIDEL alive!
Keyboard, sound, serial port, 1772... none of it is working (yet), but I believe this a very good start :)
I will check few more ICs later, but this time I think it's down to MFP.
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Re: Dead Falcon resuscitation

Postby mikro » Sat Sep 15, 2018 7:43 pm

What a terrible way to die for a Falcon. So some of the ICs were burnt?

Great skills and an eye for detail!

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Re: Dead Falcon resuscitation

Postby mpattonm » Sat Sep 15, 2018 8:36 pm

Thats right. Bloody musicians, they just dont care about their equipment. At all. Just like my brother, in average he used to kill 3 keyboards a year. They all mostly died because of spilled beer, from beeing stepped on... and of course by a cables that have AC where they should not.

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Re: Dead Falcon resuscitation

Postby mpattonm » Sat Sep 22, 2018 4:10 pm

Another tough fight today, but guess what - there is no doubt who is the winner of the day! Yes, the mighty Phoenix has arised from ashes :) Still got some wings broken, namely serial and entire sound subsystem, but its gonna be piece of cake from now on :)
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Re: Dead Falcon resuscitation

Postby mpattonm » Sat Sep 22, 2018 4:20 pm

I guess I will put a new DSP, mic, spk connectors and remaining (audio circuity) caps back on and see where we got from there today :)
See that is a precious victory. I am genuinely happy.

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Re: Dead Falcon resuscitation

Postby dhedberg » Sat Sep 22, 2018 4:57 pm

Way to go. Soon ebay will be flooded with Falcons! :wink:
Daniel, New Beat - http://newbeat.atari.org. Like demos? Have a look at our new Falcon030 demo MORE.

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Re: Dead Falcon resuscitation

Postby mpattonm » Sat Sep 22, 2018 6:12 pm

Nah, I am not selling that one. Nope. Nada. I have made that mistake some five years ago, so what I am undertaking here is kind of redemption for me. I am not going to be that stupid again. But maybe, there will be flood of Falcons NG one day ;)

Meanwhile, I got analog audio up. Boy, that keyboard ticking sound feels sooo calming now. So much for the good news. DSP is just dead as doornail, poor chip is fried...

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Re: Dead Falcon resuscitation

Postby mikro » Mon Sep 24, 2018 8:00 am

Looking forward for the full list of discovered issues! It's always interesting to know what can go wrong and how to fix it.

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Re: Dead Falcon resuscitation

Postby damanloox » Fri Nov 02, 2018 10:04 pm

hi
Could you tell me please where exactly is that ferrite bead on the motherboard? Im getting similar symptoms and would like to check it?

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Re: Dead Falcon resuscitation

Postby mpattonm » Fri Nov 02, 2018 11:24 pm

There is number of them all across the board. Search for this component:
https://i.ebayimg.com/images/g/DrwAAOSw ... s-l300.jpg


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