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Author Topic: Amiga 3000T won't boot  (Read 13253 times)

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Offline don27dog

Re: Amiga 3000T won't boot
« Reply #44 from previous page: August 20, 2010, 10:30:29 AM »
Remove the Cyberstorm. Change the jumpers on the MB and see what happens.

Jumper setting

060
100 3-4
102 1-2
104 1-2
103 2-3

040
100 3-4
102 2-3
104 2-3
103 1-2

030
100 1-2
102 2-3
104 1-2
103 2-3
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Amiga 3000T Warp Engine 4040, Elbox FastATA Controller, Progressive Perpherals ProRam3000 64Meg, Mediator, VoodooIII, Os3.9
 

Offline tlgrooms

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Re: Amiga 3000T won't boot
« Reply #45 on: August 21, 2010, 07:47:49 PM »
Don27Dog, tried removing cyberstorm and changing jumpers, still no change.
I tried my cyberstorm and picasso iv cards in my 4000 desktop and they work fine there.
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Offline TjLaZer

Re: Amiga 3000T won't boot
« Reply #46 on: September 20, 2012, 09:25:44 PM »
Did you ever get this working?  I had similar issues with my A3000T.  Turned out to be the CSMKII card and its on board oscillator.  I had to reseat the card and also make sure the oscillator was seated in firmly by bending the pins.  It was apparently not getting a good connection.  It now works great.

A little tip.  When you first power on the A3000T the green LED will start to blink immediately.  If it does not blink, something is wrong and it will not boot.  (CPU problem?)
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Offline tlgrooms

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Re: Amiga 3000T won't boot
« Reply #47 on: June 03, 2014, 06:24:59 AM »
Never did get it going.  Going to drag it out again one day soon and start troubleshooting all over again.  If I remember correctly, when I turn it on my monitor goes to a black screen (video signal present) and the green LED comes on and stays on solid.
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Offline tlgrooms

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Re: Amiga 3000T won't boot
« Reply #48 on: April 12, 2015, 06:34:53 AM »
Well I'm back again and after almost 5 years trying to get my 3000T going again.  Can anyone tell me what happens if the keylock is bad?  Would this cause the machine to come on to a black screen with a solid power light?  That's what mine does, hard drive light flickers ever so lightly (with no drives hooked up) and power light comes on and stays on solid.  Do I just wire the 2 wires together to bypass the keylock?
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Offline Blizz1220

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Re: Amiga 3000T won't boot
« Reply #49 on: April 12, 2015, 12:23:31 PM »
Well the moment you plug VGA cable into the monitor it gets ground signal and "knows" something is attached but that doesn't mean any part of that something is sending picture so that won't help diagnosing.

Since your floppy isn't clicking I "suspect" PSU , you can measure voltages with any multimer , just set it to 20 V setting and not on high voltage :)

Even better if you have spare PSU to try you might try that and before you do make sure that it's in "vanilla" state (same as it came from commodore).

Apart from that something might not be seated right.

P.S. Keylock behaviour was explained in this thread I think.
« Last Edit: April 12, 2015, 12:25:53 PM by Blizz1220 »
 

Offline smerf

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Re: Amiga 3000T won't boot
« Reply #50 on: April 12, 2015, 07:09:14 PM »
Another thing to watch out for is that the A3000 has to have the daughter board plugged in before it will boot up.  Now the A4000 will boot up without the motherboard. Good Luck on your endeavor, I have been working on my A3000 for the last 5 years, bought another one 4 years ago and it quit working this year. (big sigh), but at least my old A4000 still works but it is starting to start up with a yellow screen (oh no). My other A4000 worked about 5 minutes after I bought it, back in 95, but the good news is my old A500 is now fixed and working it was the Gary Chip gone bad. Now another piece of good news is that my CD32 still works, now only if I can find my SX-1. See what moving does to you. Still trying to sort out my disk collection of IBM and Amiga disks, the moving company packed them up all in one box, yes they just dumped them in, I guess the disk god wanted to have some fun with me. Found my new 5.25 disks for my C64 but only the blank ones, have yet to find the program disks, I think they are gone just like my A1000, isn't moving fun. My old A7nX PC computer arrived in 5 different parts as well as my old MSDOS machine, now if I can only locate the case. Got the MSDOS machine (motherboard) video card, floppy drives, memory and cdrom, don't know if the CDROM still works, but the basic stuff still works. Never put your wife in charge of moving while you are working your new job, when she moved my computer room it has been 10 years and I am still sorting stuff out and rebuilding. Good Luck on you A3000 mine used to work, but now what can I say. If the guy in Panama City Florida that grabbed my A1000 still has it can you please return it. It is in a Gray xerox typing machine case, with an Aspirit board, 68010 accelerator, Supra HD Scsi card, 5 hard drives, with seperate power supplies so that I can turn each one on or off, a supra modem, and 3 disk drives. See what happens when you tell your wife that all the computers in the garage can be thrown out, but then you forgot about your build up A1000 and C64, oh yeah forgot about my C128 desk model. But as luck will have it, I still have another 4 big boxes to go through but they will probably be cabling and wire. 10 years and still going through boxes and sorting. You should of seen my Otrana suitcase lugable computer. Can you say pancake. but the keyboard broke away from the case as it was flattened. Never move again, if I do I will sell every computer that works before I leave.
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Offline smerf

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Re: Amiga 3000T won't boot
« Reply #51 on: April 12, 2015, 07:26:10 PM »
If the keylock is bad the mouse and the keyboard won't work, the machine boots up fine, found the key to my Amiga 4000 and tried it. It booted up, but no mouse and no keyboard. Forgot about it the next day, and was ready to pull my machine apart when I noticed the key on the shelf where my monitor sits, tried it and got my mouse and keyboard back. Wouldn't know what to do without my A4000. Guess I would have to move everything over to my A1200, which isn't hard to do since it is on a CF card that is used just as a data drive. Good Luck on your Endeavors of fixing an A3000, where is Dave Highnei when you need him, he designed these conglomerations. Six or Seven Amiga models and not one of them can be used like another. One is scsi, one is ide, one is pal, the other is ntsc, one is 23 pin video, the other is vga, even the floppy drives will drive you nuts. Why do I even stay with an Amiga? I must be nuts!!!
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Offline Blizz1220

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Re: Amiga 3000T won't boot
« Reply #52 on: April 13, 2015, 11:15:09 AM »
@tlgrooms

Any luck ? :P

If not try English Amiga Board hardware forums.
 

Offline tlgrooms

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Re: Amiga 3000T won't boot
« Reply #53 on: April 14, 2015, 10:30:54 PM »
Thanks for responding.  Going to try checking the voltage on the power supply again tonight since I am going to have access to a working multimeter.  I'll post here later what I find out.  I don't guess anyone makes a power supply converter for ATX to 3000T.  I know there is one for the 3000 Desktop.  I also have my original 3000 Desktop and it is working so I have been  able to swap all the cards and chips out with it and know that they are still working.
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Offline matt3k

Re: Amiga 3000T won't boot
« Reply #54 on: April 15, 2015, 03:53:44 AM »
Is there battery damage?  look for burned traces.  I would guess that is a better guess over the power supply.
 

Offline QuikSanz

Re: Amiga 3000T won't boot
« Reply #55 on: April 15, 2015, 04:02:54 AM »
I hate to ask this, is PSU being tested under load?
 

Offline tlgrooms

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Re: Amiga 3000T won't boot
« Reply #56 on: April 15, 2015, 03:51:30 PM »
Checked the power supply both under a load and with nothing but the motherboard hooked up.  It isn't the power supply.  There is no battery damage, I removed the battery long ago when storing the machine and never replaced it.
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Offline matt3k

Re: Amiga 3000T won't boot
« Reply #57 on: April 15, 2015, 05:09:23 PM »
Did you swap out the PALS with the working 3000 desktop?
 

Offline tlgrooms

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Re: Amiga 3000T won't boot
« Reply #58 on: April 15, 2015, 05:34:04 PM »
I swapped every socketed chip one at a time that I could except for the zips.  None of it made any difference.  The 3000 desktop still worked fine after I swapped the chips.  I moved them all back as they were originally after I finished checking them.  I have not pulled all the zip chips out of the 3000T.  I guess that will be my next step.
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Offline mechy

Re: Amiga 3000T won't boot
« Reply #59 on: April 15, 2015, 10:11:37 PM »
Quote from: tlgrooms;575225
Swapped all the socketed chips in my 3000T with the ones in my 3000 desktop (known working) except for the memory chips without any change. sigh....

The 3000T is quite robust and i have worked on quite a few in my time. things i have found that do go wrong:

Power supplies(start here..check it under load. +5v rail should be at least 4.92v or they wont boot in my experience.
12v should be at least 11.92 or the same can result. you're mileage may vary here if its borderline.

check the oscillators are seated well,they are socketed.

Battery damage can be the cause of the black screen and the caps light quits toggling after about 6 tries. Look for broken traces to the rom,cpu,etc in the damaged area.the cpu is not likey to be dead,just a trace somewhere. If you have a A3640 accelerator,you might be able to change jumpers and test with that to get the machine up.

Bad roms: they have failed(bit rot)? or are making bad contact/corrosion from the battery leak. if you see green corrosion,don't try and clean the sockets etc,replace them.
Bad chip ram.. sometimes can cause a black screen. Seems some Toshiba brand zips go bad in the chip ram,i have replaced ram on 5 machines with this problem in the past. change ram as a absolute last resort

Denise socket, i had one intermittent machine with a bad Denise socket,it seems it had a pin broken between the socket and the board that make contact sometimes, you could not see it and it looked perfect.. this was a fun one to find! It was likely a factory defect and gave the original owner hell.

From what you describe,you have a broken trace near the leak. they can be a pain to fix.replace any sockets near the area and check every single one in the area for continuity!

use proper plcc pullers and not screwdrivers..messing up plcc sockets will cause more grief than anything.

sadly the battery has been known to cause problems in amiga since the mid 90's.. its a shame people didnt take them out then!.

good luck.