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Amiga computer related discussion => Amiga Marketplace => Topic started by: curtis on July 25, 2011, 02:03:56 PM

Title: WTB: A500 rev. 6A motherboard
Post by: curtis on July 25, 2011, 02:03:56 PM

Okay, I'm going to admit I'm an idiot.

I was upgrading my 6A motherboard by soldering in the RAM chips into the holes reserved for them and I discovered something after I had finished.

I soldered ALL 4 of the new RAM chips in upside-down!  @#$%&*((^%#$@@##$!!!!!

Tried to de-solder 1 chip with no joy.

So, does anyone have a 6A motherboard they'd be willing to part with for a reasonable amount?

Thanks in advance.

Curtis

Title: Re: WTB: A500 rev. 6A motherboard
Post by: tone007 on July 25, 2011, 02:08:07 PM

If the board isn't damaged, you could much more easily (at the cost of the RAM chips which are apparently lost anyway) snip the chips off of the legs.  Desoldering one pin at a time is terribly easy.

I've also had some luck with Radio Shack's desoldering iron with built-in suction bulb, but there's still usually a bit of fiddling to unstick the legs, usually after removing most of the solder with suction you have to wiggle the leg back and forth from below to break any remaining connections.

Title: Re: WTB: A500 rev. 6A motherboard
Post by: curtis on July 25, 2011, 02:58:59 PM

I'll give it a shot.  Figured the RAM chips were toast anyway.

Really annoying any way you look at it.

Title: Re: WTB: A500 rev. 6A motherboard
Post by: Heiroglyph on July 25, 2011, 04:58:00 PM

Sockets are your friend ;)

Sorry to hear you're having so much trouble.

Title: Re: WTB: A500 rev. 6A motherboard
Post by: curtis on July 25, 2011, 06:04:43 PM

Unfortunately, if you socket, the keyboard won't fit!

I almost went with sockets until I read about that little problem.

Curtis

Quote from: Heiroglyph;651612

Sockets are your friend ;)

Sorry to hear you're having so much trouble.

Title: Re: WTB: A500 rev. 6A motherboard
Post by: Heiroglyph on July 25, 2011, 06:41:42 PM

Ah, the wedge form factor strikes again!

Since you'll need new chips anyway, I'd go with tone007's suggestions.

It has to be cheaper than a new board, definitely worth a shot.

Title: Re: WTB: A500 rev. 6A motherboard
Post by: curtis on July 26, 2011, 01:53:14 PM

Well, I managed to get one chip out last night and it appears the motherboard is still good so far.

So, I'll put the request for another motherboard on hold for the moment.  At least until I get the other 3 chips out and the board cleaned up.

Curtis

Title: Re: WTB: A500 rev. 6A motherboard
Post by: curtis on July 28, 2011, 04:10:29 PM

Almost had a problem develop, finding new chips!  Fortunately, I found a PC RAM board that has a couple of meg of chips on it.

Once I get what I need, looks like I'll have several chips extra, so I'll probably offer the extra chips here for anyone else looking to do the same upgrade.

Title: Re: WTB: A500 rev. 6A motherboard
Post by: Heiroglyph on July 28, 2011, 04:40:32 PM

Awesome, glad to hear it's working out.

Title: Re: WTB: A500 rev. 6A motherboard
Post by: curtis on August 19, 2011, 03:03:13 AM

Well, the first memory board I got in had 4256 chips.  Definitely the wrong ones!

Went back and found another auction and picked up enough chips to fix the 1 500.

Took FOREVER for those 4 tiny little chips to arrive, but they came in yesterday.

Positioned them into place and checked orientation about a gazillion times!  Yes, everything is aligned with the galactic core as it should be...

Soldered them in and hooked up power supply and monitor.  Turned on the power and said a very quick prayer.

It came up to the insert disk screen!   IT'S ALIVE!!!!

Now to put it all back together and finish the tweaking and peaking.

BTW, anyone have a flicker fixer they'd be willing to part with at a reasonable rate?  Needs to be NTSC.

Curtis