Dead Falcon

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damanloox
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Dead Falcon

Postby damanloox » Sun May 20, 2018 11:29 am

I'm looking for help bringing my Falcon to life. I'm only getting black screen (ie. no vga activity/no signal at all)
The Falcon powers up (ie. LED, fan) - I checked the voltages and they seem OK. I checked CPU pin 6 and it's giving me 8MHz (Note: I only have a multimeter that happens to have frequency meter, I don't have an oscilloscope..).
I tried to check reset (as per http://atari-forum.com/viewtopic.php?f= ... C7#p273480) and it seems I have a problem with reset as I don't get HIGH on U2 pin 2. When I press reset multiple times I can get HIGH on pin 2 and the monitor comes to life but displays "out of sync" (it's multisync na works fine with TT and other machines).
Another issue I have is the CPU - I'm not sure if it was somebody's custom job or factory but pin 7 is wired to U67 and pins 18 and 19 re lifted... CPU gets pretty hot after a minute or so...
Apart from that the motherboard seems to be untouched...
Also - pins 20 and 22 seem to be shorted on J20 connector - does anybody know if that's correct?

Any ideas..?
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mikro
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Re: Dead Falcon

Postby mikro » Sun May 20, 2018 8:05 pm

Look for Atari Falcon Service Manual at https://www.dev-docs.org/docs and look for pinout for U67 and the CPU.

J20/22 jumper is correct, yes. However you can try removing it whether it leads to white blank screen.

Also if helps to connect it to RGB/TV, sometimes you see screen artifacts which can give some clues.

qazuio
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Re: Dead Falcon

Postby qazuio » Sun May 20, 2018 9:18 pm

If you have an ide hard disk or cf card etc plugged in, try booting with this removed, have had the out of sync issue brfore due to faulty/badly connected ide device.

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paul92706
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Re: Dead Falcon

Postby paul92706 » Sun May 20, 2018 9:44 pm

Pin 18 and 19 look not to be soldered and shorted? And pin 7/8 seem to also be shorted and looks to be connected to the pull resistor pack. I would look up those pins on the schematics, something is not right there.
Atari Falcon CT60/CTPCI 14MB+ 512mb ATI9250 + NetUSBee
Atari Falcon030 CF 4gb + NetUSBee+ 14MB Ram
Atari TT030 2meg STRAM/16meg TTRAM + Nova Adaptor +Maxtor SCSI HD + DaynaPort Pocket SCSI

damanloox
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Re: Dead Falcon

Postby damanloox » Sun May 20, 2018 9:48 pm

yes - 18 and 19 are lifted (but looking at the schematic they don't seem to be used anyway)..
7 and 8 are not shorted (7 is lifted and wired to U67 though but - according to other topics - it's actually from the factory on this board revision but I couldn't find the diagram for that exact revision so not completely sure)

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paul92706
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Re: Dead Falcon

Postby paul92706 » Sun May 20, 2018 9:54 pm

damanloox wrote:yes - 18 and 19 are lifted (but looking at the schematic they don't seem to be used anyway)..
7 and 8 are not shorted (7 is lifted and wired to U67 though but - according to other topics - it's actually from the factory on this board revision but I couldn't find the diagram for that exact revision so not completely sure)


Hmm! That does not look factory, it looks to be poor soldering, and unprofessional, Atari would not do such a mess job. i think someone did a mickymouse job to get output or input to that resistor pack.
Atari Falcon CT60/CTPCI 14MB+ 512mb ATI9250 + NetUSBee
Atari Falcon030 CF 4gb + NetUSBee+ 14MB Ram
Atari TT030 2meg STRAM/16meg TTRAM + Nova Adaptor +Maxtor SCSI HD + DaynaPort Pocket SCSI

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paul92706
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Re: Dead Falcon

Postby paul92706 » Sun May 20, 2018 10:02 pm

Ok i looked that line up its AutoVector signal, and looks to be done by Atari on certain revision boards, but yours looks poorly soldered! Make sure its not shorted to its neighbor pins.
Atari Falcon CT60/CTPCI 14MB+ 512mb ATI9250 + NetUSBee
Atari Falcon030 CF 4gb + NetUSBee+ 14MB Ram
Atari TT030 2meg STRAM/16meg TTRAM + Nova Adaptor +Maxtor SCSI HD + DaynaPort Pocket SCSI


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