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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: funcle on October 18, 2009, 08:53:15 PM

Title: A3000t "t" for toast?
Post by: funcle on October 18, 2009, 08:53:15 PM: Just got a 3000t and only getting a purple screen {no insert disk animation} Tried ram & chips from a working 3000d but still same result. Jumpers are all correct and I'm thinking battery leakage, although the area seems pretty clean. Anything I should also be looking at?
Title: Re: A3000t "t" for toast?
Post by: VingtTrois on October 18, 2009, 09:26:16 PM: Quote from: funcle;526438
Just got a 3000t and only getting a purple screen {no insert disk animation} Tried ram & chips from a working 3000d but still same result. Jumpers are all correct and I'm thinking battery leakage, although the area seems pretty clean. Anything I should also be looking at?

Check if memory (ZIP & DIP) are correctly inserted on their support.
Title: Re: A3000t "t" for toast?
Post by: funcle on October 18, 2009, 10:49:31 PM: Well, I re-seated all the zips, same result! I'm guessing the MObo is just done! I'm sure the memory, roms and chips are all good.
Title: Re: A3000t "t" for toast?
Post by: amiga92570 on October 18, 2009, 11:19:26 PM: Quote from: funcle;526445
Well, I re-seated all the zips, same result! I'm guessing the MObo is just done! I'm sure the memory, roms and chips are all good.

Try reseating Denise chip, if that does not work. Unplug floppy drive cable and see what happens.
Title: Re: A3000t "t" for toast?
Post by: funcle on October 18, 2009, 11:57:40 PM: ..Denise chip reset didn't work either, even tried with a spare Denise as well..still no luck!
Title: Re: A3000t "t" for toast?
Post by: tone007 on October 19, 2009, 01:22:56 AM: Check all power supply voltages.
Title: Re: A3000t "t" for toast?
Post by: amiga92570 on October 19, 2009, 03:14:11 AM: Quote from: tone007;526453
Check all power supply voltages.

I would assume he had done that?:confused:
Title: Re: A3000t "t" for toast?
Post by: orb85750 on October 19, 2009, 03:51:58 AM: Quote from: funcle;526438
Just got a 3000t and only getting a purple screen {no insert disk animation} Tried ram & chips from a working 3000d but still same result. Jumpers are all correct and I'm thinking battery leakage, although the area seems pretty clean. Anything I should also be looking at?

There are no other expansion boards present, right?
Title: Re: A3000t "t" for toast?
Post by: 57goldtop on October 19, 2009, 08:56:00 AM: What's the capslock key light doing ?
Title: Re: A3000t "t" for toast?
Post by: funcle on October 19, 2009, 09:07:25 AM: Voltage is ok, no boards present.. the caplocks key is out.. keyboard flashes quickly when powered up.
Title: Re: A3000t "t" for toast?
Post by: spirantho on October 19, 2009, 10:19:40 AM: Taking a shot in the dark, I'd say if the screen is purple then it's checking the SCSI bus or the floppy. I presume you've tried with no hard disk as well... what happens if you leave the machine for a while, say an hour or two?
Might just be a job for a recapping...
Title: Re: A3000t "t" for toast?
Post by: 57goldtop on October 19, 2009, 11:44:23 AM: Did you check the voltages with the power supply under load ?

Blinking of the caps lock may indicate a hardware problem depending on the number of blinks.

Capslock Key:
Stays on for several secs One blink (ROM checksum failed)
Two blinks (RAM test failed)
Three blinks (Whatchdog timer)
Four blinks (A short exists between
2 lines or one of the
special keys)

Please note that the capslock 'blinks' are short in duration (about one
second) and that your screen colors may falsely indicate a problem when
you do a 'warm' boot depending on what state the Amiga was in before the
warm boot. Its best to watch for these diagostic errors upon initial
startup. If your Amiga exhibits any of these errors frequently, you should
take it to an........

http://www.scribd.com/doc/12780916/Amiga-Boot-Sequence
Title: Re: A3000t "t" for toast?
Post by: funcle on October 20, 2009, 11:58:39 PM: Tried leaving machine on for a couple hours as suggested... no change. Worst case scenario, I have a good parts machine or if by some stroke of luck, I come across a A3000t motherboard looking for a new home!
Thanks for all the suggestions, I'll keep plugging away... I'm quite persistent!
Title: Re: A3000t "t" for toast?
Post by: rkauer on October 21, 2009, 05:35:17 AM: Did you use the PSU tick or the internal motherboard's Vsync? To ensure that the A3000 works, connect jumper J350 across pins 2-3 to ensure that the machine generates the TICK signal from the VSYNC signal.

That's a fail-proof way to eliminate the lack of "tick" signal as a fail cause.

Recapping the board can help, too.
Title: Re: A3000t "t" for toast?
Post by: don27dog on October 21, 2009, 10:20:01 AM: Check the orientation of the rom chips. I vaguely remember a purple screen on my 3000T when I switched to 3.1 roms.
Title: Re: A3000t "t" for toast?
Post by: funcle on October 23, 2009, 12:12:48 AM: Well I moved the J350 to pins 2-3, no tick... same results. Checked ROMs and chip orientations everything is as it should be.
Title: Re: A3000t "t" for toast?
Post by: Jiffy on October 23, 2009, 07:27:25 AM: Quote from: amiga92570;526456
I would assume he had done that?:confused:

Assumption is the mother of all fuck ups.
Title: Re: A3000t "t" for toast?
Post by: dannyp1 on October 23, 2009, 03:12:21 PM: So you did say that you tried starting the computer with the scsi cable unplugged from the motherboard? Doing that can eliminate a whole area of possible problems.
Title: Re: A3000t "t" for toast?
Post by: amiga92570 on October 23, 2009, 04:38:42 PM: Quote from: Jiffy;526950
Assumption is the mother of all fuck ups.

I assume you have plenty of experience with that. :roflmao:
Title: Re: A3000t "t" for toast?
Post by: funcle on October 25, 2009, 12:25:26 AM: Yeah, I tried without scsi connected... the cpu is probably done. (I'm guessing) I have other projects I've been falling behind on. Maybe sometime down the road I'll try getting this machine working again! Thanks!
Title: Re: A3000t "t" for toast?
Post by: graffias79 on October 26, 2009, 11:20:57 AM: If you have an A2091 laying around, try swapping the WDC SCSI chip with the 3000T, that will at least eliminate that possibility. My 3000T has flaky SCSI as well (no purple screen though)
Title: Re: A3000t "t" for toast?
Post by: funcle on October 29, 2009, 11:25:23 PM: Gave that a whirl.. didn't make a difference. Also had a couple WDC scsi chips I also swapped out. I noticed around the CPU what looks like residual buildup between the pins, I tried cleaning and blowing it out, but still remains. Almost looks like the pins may have fused! Tried another workaround with a G-Force 40 in the the CPU slot (figured this would bypass the 60830 on Mobo) but alas, the same purple screen!! I'm stating to hate "purple"...
Title: Re: A3000t "t" for toast?
Post by: rkauer on October 29, 2009, 11:40:23 PM: Time to clean the motherboard in the most drastic way: toss it inside the dishwasher in ecological cycle and let it dry for a week in a ventilated cupboard, them assemble it again.
Title: Re: A3000t "t" for toast?
Post by: dougal on October 30, 2009, 08:53:17 AM: Could it possibly be the ROM is faulty ?
Title: Re: A3000t "t" for toast?
Post by: funcle on October 31, 2009, 10:55:46 PM: Nah, I had swapped out the Rom's at first (no difference).. dishwasher treatment sounds interesting, do I have to worry about streaking??