Another A500...another problem...

[Gavilan]

Hi People: i have managed to get a very good (at least aestethic) A500, revision 5.
Problem is, i power it on...only to get a green screen, and the power switch keeps blinking...thats all i got.
I opened, reseated all the chips....no luck...
I noticed that when i powered off, i could hear the df0 spinning and stopping shortly after i powered off...
Any ideas, comments , suggestions in order to revive what it looks to be a dead A500??
Kind Regards

Sebastian
 :-?  :-?

[Gavilan]

Hi Jim!! so you think the light green colour means faulty kickstart??

[Gavilan]

Well...actually after a deepest investigation i found the 8372A chip has a missing pin...damn...i guess thats why im getting a green screen every single time i switch on the computer, right?
Is it possible to fix this? Or will i have to buy another chip? Also, the socketed place where the chip goes sitted is missing the same pin too...so i guess somebody without much experience played with this poor A500...
Lucky me uh!

 :-o

[Gavilan]

Well..i guess its pin 13...but..no..it wasnt removed on the socketed place..just it seemes like it bended and got broken....i have it here...almost laughing at me...It was removed from the Agnes itself, but i cant see it on the socketed place. It was like glued or someting, and when i did my deepest researching, it just went away.


Say..i have a complete useless mobo now? Could i try with another chip from some of my other A500´s??
 :-?

[Gavilan]

Jim i dont know how to put pictures here, but i have taken a pic (not the best quality tough), so that can enlighten you a little more...Could i send it to you?

[Gavilan]

Hi Jim!!
[/quote]
Maybe they phsyically damaged the Agnes or the socket in the process. Does the A500 have a memory expansion in the belly slot? If not, from my experience, then even with this pin lifted it should still work and should still default to NTSC. My experience is limited to only rev 5.A(iirc).
Ok, so even with this pin lifted it should work...but what about the pin lifted in the socket?? I have one missing contact in the socket as well..

Well...i have a revision 5 as well...

I'd start off trying another Agnes.

You mean i could try any Agnes from any of my other A500´s? Or it has to be the exact same model?

Do you have an A501 in place? [/quote]
No, no A501 in place at this moment. I got this one without a A501. I have 2 of them in my other A500´s. Your advice is to try that also?

[Gavilan]

Noster wrote:
> @Gavilan

What do you have in Argentina ? PAL or NTSC ?
I would try to replace the CIA 8520. There should be two of them on the board, don't know which of them is the CIA-A and which is the CIA-B, but you've said you have more Amigas, so replace both of them and test which one is defect.
Maybe the error is a missing memory expansion and the A500 is reworked to 1MB chip and the Agnus is missing the second 512kB memory ?

Noster

Is it possible to exchange CIA-A with a CIA-B or you mean that i should try other CIA-A from some of my other machines in the CIA-A possition in my new machine?
Well...we have here PAL...but i would say that 90% of the amigas that were imported here were originally NTSC, and were hacked in some ways to be PAL or to be binorm (i mean be pal-ntsc compatible, you just switch that pressing mouse button during bootup).
I have 7 A500, all with different kind of hacks or stuff.
Maybe the error as you pointed was a missing memory expansion. I could try that, but...since i also have a missing pin on the socket...that seems like a nos so easy task to do for a hobbyst like me  :-D
Anyway guys, thanks a lot for all info and directions you gave me.
Its a pity. I got a beatiful A500 but cant make it to work.
Anyway, i have learn a lot about this. I will be doing some more research on this subject when i get home (that is, in 6 more days, since we are having holidays here.)
By the way...HAPPY EASTER to all of you!!!
 :-D

Sebastian

[Gavilan]

Well guys...after my vacation...im back to business...news here:
- i exchanged chips as you guys suggested....put from a working A500 in my "damaged" mobo..nothing...
Then i put the Agnes from the damaged mobo in my other A500...working!!!
I tried CIA chips from damaged mobo in other A500...nothing...so my guess is: i have more than 1 chip broken and/or damaged mobo is REALLY damaged..
Anyway...case is brand new, i got a workin psu and a "new" keyboard...so after all nothing is wasted.
Just wanted you to know how things ended.
Once again thank you guys a lot for all info/help/tips

Kind Regards
Sebastian

[Gavilan]

Well guys...after my vacation...im back to business...news here:
- i exchanged chips as you guys suggested....put from a working A500 in my "damaged" mobo..nothing...
Then i put the Agnes from the damaged mobo in my other A500...working!!!
I tried CIA chips from damaged mobo in other A500...nothing...so my guess is: i have more than 1 chip broken and/or damaged mobo is REALLY damaged..
Anyway...case is brand new, i got a workin psu and a "new" keyboard...so after all nothing is wasted.
Just wanted you to know how things ended.
Once again thank you guys a lot for all info/help/tips

Kind Regards
Sebastian