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[Jiffy]

And chips received!

I think I'm going to make my A3000 happy next weekend. ;-)

[RobertB]

That reminds me to eventually replace those chips with some of your chips in my A3000, too. :-)

Truly,
Robert Bernardo
Fresno Commodore User Group
http://videocam.net.au/fcug
The Other Group of Amigoids
http://www.calweb.com/~rabel1/

[Bandis]

Hi

As it happens I have a 3000T mobo laying around wich only shows the dreaded black screen of death. (no activity what so ever, only powerled goes green)

Is there a possibillity that theese chips could be at fault then? What do they do?

Regards

Bandis wrote:
Hi

As it happens I have a 3000T mobo laying around wich only shows the dreaded black screen of death. (no activity what so ever, only powerled goes green)

Is there a possibillity that theese chips could be at fault then? What do they do?

Regards

In this case, truly, many things could be wrong. So I wouldn't want to point you in the wrong direction.

I have a similar problem with an A3000D Mobo and it turns out the CPU is dead. That's not something I can desolder from the board so this board will be depopulated and trashed.

[Plaz]

I have a similar problem with an A3000D Mobo and it turns out the CPU is dead. That's not something I can desolder from the board so this board will be depopulated and trashed.

FYI, I have 2 A3000's that suffered the same problem. On the first I simply cut the legs away from the CPU with a very sharp exacto blade. Once the chip was out, it was easy to unsolder the the legs from the motherboard. A couple of years later I used a heatgun to remove the bad CPU from a second 3000D. Of course you have to protect other parts of the motherboard from the heat. Tin foil does a good job. Once the old CPU is out, you plug in an external 030, 040 or 060 card and you're good to go again after setting the jumpers for external CPU.

Plaz

[hardlink]

Plaz wrote:

FYI, I have 2 A3000's that suffered the same problem. ...

I'm sort of surprised; I've never seen a Motorola 68K fail before, and we have and still use a lot of old ones on VME boards at work.

hardlink wrote:
I'm sort of surprised; I've never seen a Motorola 68K fail before, and we have and still use a lot of old ones on VME boards at work.

My first time... I hope its the last but judging from Plaz's post, I'm not the only one who had this problem.

These replacements chips are still available... :-)

[Jiffy]

eslapion wrote:
These replacements chips are still available... :-)

...and I can confirm they work nicely in my A3000... ;-)

[DutchinUSA]

Does anyone still program these nowadays? Looking for some, especially u202 & u203

[matt3k]

These still available for the 3000?

[DutchinUSA]

Also still looking for these.

This is what I found after a google and it seems to be exactly what I was experiencing on my 3000.

"U202/203: Chips That Overheat
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Many A3000 owners complain of strange graphics and disk errors,
like windows and gadgets being trashed. Sometimes dots and horizontal
lines will appear. This is likely due to the U202 and U203 components,
a pair of Programmable Array Logic chips (format: 16L8-10) which tend to
overheat."

[Cosmos]

Maybe I have them in stock : I'll see tomorrow !

[DutchinUSA]

That would be great ! Thanks man

[ChaosLord]

Every Amiga 3000 needs its U202 and U203 chips replaced! You either should have replaced them long ago or you need to replace them in the future. But sooner or later they must be replaced.

When U202 and/or U203 start overheating you get all sorts of weird sparkly graphics on the screen and some random memory corruptions. Its awful.

But it is really easy for a newb to replace these chips.

I bought my replacements from some place in Canada back in the 1990s (maybe 1994?). I wish I would have bought a whole stack of extras for other ppl to make sure we never run out. The replacement chips work great!