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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: RiP on April 09, 2018, 05:24:47 PM

Title: Need help for repairing 30-pin ram boards
Post by: RiP on April 09, 2018, 05:24:47 PM

I tried to fix my faulty ram boards by replacing the 4Mbit DRAM chips but got no success :(
Should I replace the parity chips too? (in the cyan box)
There's one SMD under each chip too. Is it resistor or capacitor? and possible to test them?

(https://thumbs2.imgbox.com/4a/b0/b74MU5yz_t.jpg) (http://imgbox.com/b74MU5yz)

Title: Re: Need help for repairing 30-pin ram boards
Post by: Vlabguy1 on April 09, 2018, 05:39:14 PM

Quote from: RiP;838376

I tried to fix my faulty ram boards by replacing the 4Mbit DRAM chips but got no success :(
Should I replace the parity chips too? (in the cyan box)
There's one SMD under each chip too. Is it resistor or capacitor? and possible to test them?

(https://thumbs2.imgbox.com/4a/b0/b74MU5yz_t.jpg) (http://imgbox.com/b74MU5yz)

Seems easy enough to replace.  At least for me anyway.

Title: Re: Need help for repairing 30-pin ram boards
Post by: mechy on April 09, 2018, 09:36:23 PM

Quote from: RiP;838376

I tried to fix my faulty ram boards by replacing the 4Mbit DRAM chips but got no success :(
Should I replace the parity chips too? (in the cyan box)
There's one SMD under each chip too. Is it resistor or capacitor? and possible to test them?

(https://thumbs2.imgbox.com/4a/b0/b74MU5yz_t.jpg) (http://imgbox.com/b74MU5yz)

Sorry to ask this,but 30 pin simms are cheap and redily available,why you trying to fix them?

for example: http://www.memoryx.com/generic-memory-30-pin-simm.html

Title: Re: Need help for repairing 30-pin ram boards
Post by: RiP on April 09, 2018, 10:27:56 PM

Ok, I'll try to replace the parity chips too but I thought Amiga doesn't care about parity :confused:

Unfortunately these rams are rare here and I need them to fill my GVP A2000 HC+8 =/

Title: Re: Need help for repairing 30-pin ram boards
Post by: mechy on April 10, 2018, 12:05:37 AM

Quote from: RiP;838388

Ok, I'll try to replace the parity chips too but I thought Amiga doesn't care about parity :confused:

Unfortunately these rams are rare here and I need them to fill my GVP A2000 HC+8 =/

gvp cards use standard 30 pin simms like i posted in the links, they are not rare or special.
the card can use 8 chips simms,9 chip simms(parity) or the same u have.

Title: Re: Need help for repairing 30-pin ram boards
Post by: RiP on April 10, 2018, 09:33:54 AM

I know but it's rare here and shipping costs so much.
It's easier for me to repair.

Title: Re: Need help for repairing 30-pin ram boards
Post by: RiP on April 12, 2018, 03:55:34 PM

Quote from: Vlabguy1;838377

Seems easy enough to replace.  At least for me anyway.

Well, I changed the parity chips but still no luck :(