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

[Bazzaq]

what revision is it?? u152 does not appear on here.> http://www.amiga-hardware.com/download_photos/a4000revbmb_1.jpg

just empty.
some more info on the fault and you will get more replies to help.

does it power on, if so do you get a display? what colour is the display if any, flashing power light or keyboard light sometimes point to a fault.

do you have the roms/memory/cpu installed correctly?

[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

[rkauer]

 Hello, El Piloto!

 Glad to see you here. Shame that is this bad situation.

 Looks like you have a bad CPU card. Look for the jumpers who are able to set internal or external CPU (you have a 2B revision board, so you have an 030 in the mobo).

 The jumpers (to make the board boot with internal 030 CPU, no accelerator):

 J100: 1-2 (leave 3 open)
 J104: 1-2 (diddle)

[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?

[TDScompute]

How serious are you about getting this baby up and running? I have three A4000 mainboards and an extra A3640 board on hand, but I am planning on eventually selling them on Ebay. I know that two of the boards are an older rev, and are missing some chips, but you could probably use the chips on your board to bring it to life.

If you want, I will provide some pictures of the boards and test them out to see if they boot OK. (I have some extra ROMS somewhere to test them out...)

Please feel free to PM me if you want me to pursue this. The chipless boards will be inexpensive, but I would ask more for the board with the chips still on it.

Thanks,

Douglas

[Amiga4k]

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.

You need the daughter card. I do have a spare, from a good machine. Email me.

[rkauer]

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

regards
Hernan

 Sorry, my bad. Only revision D have a 030 on board. You need to grab another accelerator to test your system.

 BTW: how is the area around the battery?

[McVenco]

It could be that the connection of the CPU card is faulty, I've had the same problem with similar symptoms. Take out the CPU card, clean the contacts and reseat the card while applying a little pressure after it's seated (not too hard).

Good luck.

[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

[chiark]

The 4000 *will* boot without the expansion riser card.

for what it's worth, my 4000/Warpengine 4040 recently died and it turned out to be that the warpengine had died.  Damn.

Hope you get it working again - I'd suggest trying another known good 3640 or 3630: someone was kind enough to sell me a 3640 for $50

[elpiloto]

i hope to find an A3640 for $50

[chiark]

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.

[McVenco]

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