Need a Buster Chip! Yellow screen problem on my a4k

[magnetic]

Hey guys

If anyone has a Buster chip for a3k, a4k (rev doesnt matter) as a replacement chip. I'm willing to buy or trade.

My friend gave me an a4k and removed the buster 11 - i recently installed one and now I get a light grey screen like its going to boot and then yellow (not a chip ram error as I it worked 100% before) i even removed all the simms and reseated the chip ram.... any help is appreciated. thanks

[Cosmos]

Without the 2 Mo chipram, have you a green screen ??

[magnetic]

Hi Cosmos

Thanks for the reply. Yes without the chip ram I get a green screen. What does this mean?

[Cosmos]

Good ! The chipram bridge is probably working !

[FOL]

Is Buster socketed?

If so remove socket and hard solder buster to Mobo. I had same problem recently, turned out to be socket.

[Jope]

Perhaps replace the socket instead of soldering the chip directly.

[rkauer]

If the problem is just bad contact the chip may be oxidized.

Sack it out, put on a lemon juice glass for half an hour, then wash the chip with a soft toothbrush under the tap.

Reinsert after complete dried up and test again.

[magnetic]

Hey guys i'd rather not replace the socket as i've yet to try another buster chip (anyone have one? )

Also of note is the power LED flickers rapidly before the yellow screen...

[bebek]

Had the same , battery leak damaged vias around 74F245

[magnetic]

Cosmos

by the 'chipram bridge" being OK what does that mean in english?

[Cosmos]

Pffft... In english ??

I'm a french specialist : un écran vert sans Simm 2 Mo indiquerait que les composants s'occupant de la gestion de la chipram fonctionnent correctement !

[Jope]

Originally Posted by Cosmos

Pffft... In english ??

I'm a french specialist : un écran vert sans Simm 2 Mo indiquerait que les composants s'occupant de la gestion de la chipram fonctionnent correctement !

And we're the English Amiga Board. Please stick to English.

[Cosmos]

I'll post in french only now and TheCyberDruid will translate

[TCD]

Originally Posted by Cosmos

I'll post in french only now and TheCyberDruid will translate

"without a green screen Simm 2 Mb indicate that the components involved in the management of chipram work properly!" (c) Google translate
Like Jope said, post in English please.

[LTAC]

Originally Posted by magnetic

Hey guys

If anyone has a Buster chip for a3k, a4k (rev doesnt matter) as a replacement chip. I'm willing to buy or trade.

My friend gave me an a4k and removed the buster 11 - i recently installed one and now I get a light grey screen like its going to boot and then yellow (not a chip ram error as I it worked 100% before) i even removed all the simms and reseated the chip ram.... any help is appreciated. thanks

To be complete, you should indicate that you have the same problem with a Buster 07 that was sent to you by a French [on AMIGA.ORG]. This Buster was tested 100% OK.

[DarrenHD]

Originally Posted by LTAC

To be complete, you should indicate that you have the same problem with a Buster 07 that was sent to you by a French [on AMIGA.ORG]. This Buster was tested 100% OK.

I have a similar issue (which i've written about before) in one of my A4000's. Changing the buster chip didn't help. Basically Zorro III operation is not working, only Zorro 2. Weird. No battery leakage or other visible signs of a problem...but it wasn't the buster chip, unless something under the socket itself is wrong.

But otherwise it runs fine in Zorro 2 mode.

[rkauer]

Of course replacing Buster will not help on Fast RAM issues. The problem is related to Alice (Agnus replacement)!

[magnetic]

Cosmos

I wansnt making fun of your english. Thats a phrase ppl say in america when someone talks to technical

@ Ltc

I dont think you read it right, and I told you on pm on aorg I appreciated you tested it but my reality is the machine worked 100% fine with the buster11, which I removed and the machine then sat until I got your buster 7. Now I get a yellow screen, so after years of working with amigas I deduced that I need to try another buster. this is standard tech procedures. I did also check the chip ram socketing and buster position and socketing.

I cannot really diagnose fully until I change the buster again as its the only thing to change from when it was working fully.

[DarrenHD]

Originally Posted by magnetic

Cosmos

I wansnt making fun of your english. Thats a phrase ppl say in america when someone talks to technical

@ Ltc

I dont think you read it right, and I told you on pm on aorg I appreciated you tested it but my reality is the machine worked 100% fine with the buster11, which I removed and the machine then sat until I got your buster 7. Now I get a yellow screen, so after years of working with amigas I deduced that I need to try another buster. this is standard tech procedures. I did also check the chip ram socketing and buster position and socketing.

I cannot really diagnose fully until I change the buster again as its the only thing to change from when it was working fully.

@magnetic

I don't think the A4000 ever shipped with a Rev-7 buster. I think it started at Rev. 9. So probably best to put a Rev.9 or 11 in it, and not a Rev. 7.

Rev 7 was for the 3000 afaik.

Darren

[magnetic]

Hi Darren!

Actually i've seen quite a lot of amiga 4000 rev b motherboards here in the usa with Rev 07!

UPDATE:
I pulled the buster 7 a nice amigan gave me out with a puller tool and discovered that it was missing one leg! Thats right, even though looking at it is some kind of optical illusion because the pins are so small! I counted them to make sure.. This probably explains why the yellow screen..

If anyone has a buster chip any rev 7 or higher that wants to sell it please let me know. Thank you