Dead A4000/040

[elpiloto]

hi,
some days ago i bought an A4000/040 that doesnt work, looking carefuly at the mainboard i found that the component U152 is not there, seems that someone took it. I dont have so many chances to find an a4000 mainboard here, so, is there any other way to find this U152 and come back to life this A4000?

regards
Hernan

[elpiloto]

hi,

Well, now that i see that pic i assum that on B rev the U152 IS empty, and nothing must be there, seems that i saw some other rev, my fault.

Well my REV is B, im testing the motherboard out of the case with the a3640 board on, and without the dougther board because i suspect that a capacitor is in short.
When i hit the power button the psu starts ok, the power led comes ON, the hdd starts spining but the hdd led is OFF all the time, the FDD dont click looking for disk, the screen is black all the time, the CAPS LOCK seems to be ok, dont flash, and if i hit it the light comes on and if i hit it again the ligh turns off. If i reset the machine (ctrl + A + A) the power led lower its intensity and after a sec show its full intensity again ( like when i reset my a500 and a1200) but the screen continue black
I looked for some cut or some corossion on the motherboard and i didnt find anyone, seems that there are not shorts on the mainboard, i cleaned all with isoprophyl alcohol.
I checked the psu V values an they are OK, i also checked cuts, corossion signs and shorts on the A3640, but there are no one, also i changed the capacitors on the A3640 board ( according to http://amiga.serveftp.net/A3640_capacitor.html) because i had the reverse polarity thing on my A3640 board.
Also i noticed that gary, super buster and ramsey dont gain the normal operation temperature, they are cold, not like the other ones.
Im a bit stuck and i will be very thankfull for any help
 :-)

regards
Hernan

[elpiloto]

Hi rkaurer
the mainboard says REV B
both jumpers are on EXT position.
I dont see any 68030 procesor on the mainboard

regards
Hernan

[elpiloto]

any idea?

[elpiloto]

RKAUER:
the area arround the battery is ok, no corrosion

McVenco:
I already did what you say, but im in the same situation, black screen :cry:


Amiga4K:
The A4000 will not boot without the daughter board?? some one told me that have to boot without it

TDScompute: im very very serious about getting this a4k up and running again, i cant live with a none working amiga, i have to fix it

cheers
Hernan

[elpiloto]

i hope to find an A3640 for $50

[elpiloto]

crumb im going to send u a pm right now
ya hemos hablado en retrocomputacion !  :-)

[elpiloto]

McVenco wrote:
If it's of any help, I have a spare A3630 card that I could part with...

does it works ok? whats the price? pm me please

regards
Hernan

[elpiloto]

chiark wrote:
Good luck - the guy I bought off was also selling an Apollo 4040 and if I'd have known the warpengine was dead, I'd have had that instead...  

Try a "wanted" advert, and point out that you've got a dead machine that you're working on - you might get lucky?

EDIT: if I find anyone with a working CPU card for sale, I'll drop you a PM.

ok, thank u, i apreciate that!

regards
Hernan

[elpiloto]

smerf wrote:
Hi,

@elpiloto,

Just pulled my A4000 with O40 card out of the Attic, had
the same probem as you have, first thing is check your ide
cable and make sure it is not intermittent, make sure it is
totally plugged in at both ends, check your floppy disk
cables make sure both are tight and then finally check your
CPU 040 card. Press down on it a couple of times and make
sure it is will seated. My old Amiga had an intermittent
ide cable, and a floppy drive cable that was only half way
plugged in. Try CNTRL AMIGA AMIGA does the lights flash
and does it look like its trying to reboot.

Are your JUMPERS correct for an 040 card?

Next thing is do you have a SCSI card in one of the slots?

If you do remove it, because this produces a 30 sec to a
minute delay before the system actuates.

How old is your battery, mine when I first turned it on
after sitting unused for two years, was completely dead, it
took almost 8 hours to get enough charge to actuate the
OS chips so the computer knew what to do on boot up, but
I knew this because my Amiga 4000 always had this problem
when I didn't use it, I solved this problem by going to
Wal-Mart and bought a new 3.6VDC phone battery and put it
in, and yes hillary a 3.6VDC battery works better than that
little piece of junk that came with the Amiga, just get an
old phone, cut the plug off, carefully remove the battery,
leaving the two thin ends still soldered to the board,
solder the plug that you cut out of the old phone to the
two thin tabs you left in observing polarity, and plug in
the phone battery into the plug you removed from the old
phone.

Summary:

Check Floppy disk cable
Check IDE cable
Check Battery
Check Jumpers
Press down or reseat CPU card.

If that don't work, sell me the Amiga 4000 for spare parts.

Good Luck, hope my suggestions work, it will be great to
hear that another Amiga 4000 was saved from scrap heap.

smerf

i did all waht u are saying, nothing happened, my battery is not there i removed it, as far as i know, the battery is only for date keeping, and cant make a machine to not boot, may be im wrong?

[elpiloto]

taunusand wrote:
I have 2*A4000 & 1*A3000, ALL without battery! And all 3 of them works just fine witout the battery :-)

The battery is just for time & date.

My suggestion: Try another set of kickstart roms.

Maybe I have missed it in the thread.. But, have you tried testing without the cables for harddisk & floppy?

Yes! im testing the a4000 witout both cables, floppy and hdd, and i dont have any card installed zorro´s, only the mainboard and the a3640