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Old 06-16-2012, 07:59 PM   #21
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Default Re: My 500+ Project

Just got back from Jaycar with 2x 24 pin ic sockets and a new can of isoprophyl, gonna have to wait till later tonight tho as off to see my folks for the arvo.
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Old 06-16-2012, 08:45 PM   #22
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Default Re: My 500+ Project

If you lift any of the green protective paint off the copper tracks with your alcohol, go buy some cheap girly nail polish, a bright colour!

This can be painted over any exposed areas of the motherboard/copper you need to repair, works well.

Also, if you have small sections of track that are suspect or badly corroded, buy a rear window demister repair kit from a local car spare parts/autobarn/repco. The silver conductive paint can be used to redo the damaged tracks for short distances. Wait until dry then cover with nail polish

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Old 06-16-2012, 08:58 PM   #23
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Default Re: My 500+ Project

Good tips, thanks as the last proper techie job I had was in the late 90's so I've forgotten a lot of these tricks.
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Old 06-17-2012, 04:28 PM   #24
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Default Re: My 500+ Project

Well after a hard nights careful de-soldering (last night) I was able to remove half the Gary Socket and only have the other half to go (old solder is a pain to work with).

I was also able to clean the motherboard with Isoprophyl and a toothbrush/rag and it came up really well, so well in fact that I couldn't find a single damaged trace or area missing lacquer (mainly just discoloration) so now Im really optimistic that I'll be able to return my Miggy 500+ to full health!
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Last edited by djos; 06-17-2012 at 04:37 PM..
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Old 06-17-2012, 06:48 PM   #25
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Default Re: My 500+ Project

Quote:
Originally Posted by djos View Post
Well after a hard nights careful de-soldering (last night) I was able to remove half the Gary Socket and only have the other half to go (old solder is a pain to work with).

I was also able to clean the motherboard with Isoprophyl and a toothbrush/rag and it came up really well, so well in fact that I couldn't find a single damaged trace or area missing lacquer (mainly just discoloration) so now Im really optimistic that I'll be able to return my Miggy 500+ to full health!
Good to hear!
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Old 06-17-2012, 06:52 PM   #26
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Default Re: My 500+ Project

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Good to hear!
Indeed, just need to finish replacing the socket and plug her in when my new PSU shows up. *fingers Crossed*
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Old 06-17-2012, 06:54 PM   #27
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Default Re: My 500+ Project

pics? :P
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Old 06-17-2012, 07:07 PM   #28
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Default Re: My 500+ Project

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pics? :P
Will try and take some tonight, wife was giving me the hurry up.
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Old 06-17-2012, 08:55 PM   #29
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Default Re: My 500+ Project

Awesome! Good to hear about the tracks after the clean up... replacing sockets is a pain, make sure you do not make any solder bridges on the legs. Check with a magnifying glass if you have one.

Hope Gary works for you.

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Old 06-17-2012, 09:03 PM   #30
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Default Re: My 500+ Project

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Originally Posted by Azryl View Post
Awesome! Good to hear about the tracks after the clean up... replacing sockets is a pain, make sure you do not make any solder bridges on the legs. Check with a magnifying glass if you have one.

Hope Gary works for you.

Az
Thanks, yeah removing a Socket is really hard, I wish I had a nice Weller Soldering/de-soldering station like back in my techo days as solder suckers are close to useless and de-soldering braid can be tricky to use on such small holes.

I do all this sort of work with a mag-glass mounted on my little small-pcb holding stand thingo.
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Old 06-17-2012, 11:18 PM   #31
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Default Re: My 500+ Project

When you have this A500+ working again, you will find very little speed increase with the 68010 at standard clocks + no cache

you need to find one of these! http://amiga.resource.cx/exp/adspeed

I have one in a box somewhere

oh, I also have one of these! http://amiga.resource.cx/exp/mtec520i
(installed in my a2000 atm with budha card+ 4gig HD, cdrom, amber flicker fixer and a picasso II )

and one of these http://amiga.resource.cx/exp/blizzard500

and 2x of these as well http://amiga.resource.cx/exp/supra28

finally one of these http://amiga.resource.cx/exp/pamc500
(installed in another a2000 with gvp8+ 2gig scsi + cdrom)

yeah, I have too much stuff... some in boxes never installed

ah well.... Amiga is addictive!

Az
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Old 06-17-2012, 11:29 PM   #32
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Default Re: My 500+ Project

LOL, very nice - I mainly got the 68010 so that I can switch back to workbench from WHDLoad installed games.

Im going to order the latest Gen 68kIDE adaptor with CF module, 8MB Processor Ram module and 1MB Chip Ram board as soon as I've resurrected my 500+ - that'll give me 10MB Ram total and a 4GB CF HDD.
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Old 06-19-2012, 11:53 PM   #33
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Default Re: My 500+ Project

Some goodies arrived in the mail today from AmigaKit:

Miggy PSU, cr2032 lithium battery kit, 2nd Comp Pro Joystick, RGB-SCART Cable, Miggy-VGA Adaptor

and my 68010 also arrived, just need to finish restoring my 500+ now (hopefully i'll get a chance tonight)!
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Old 06-20-2012, 12:01 AM   #34
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Default Re: My 500+ Project

Keep up the good work!

Hope we hear a success story soon

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Old 06-20-2012, 06:54 AM   #35
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Default Re: My 500+ Project

Managed to finish removing the corroded socket and install the replacement tonight but still have some work to do before my 500+ is fully working.

I reckon I need some finer grit sandpaper than I have to clean the feet on the Gary chip as I put it in and powered it up (just composite for now) and All I got was a flashing screen and an occasionally flashing Power Light (sort of dims to flash).

anyway here's some pics so far:

Lid on:
http://dl.dropbox.com/u/71121999/Ami...2018.18.32.jpg

Half the socket gone, board mostly cleaned:
http://dl.dropbox.com/u/71121999/Ami...2018.55.41.jpg

New Socket install (2x 24pin):
http://dl.dropbox.com/u/71121999/Ami...2020.55.19.jpg

Gary Chip in socket to make sure it fits + battery area and for a quick but so far unsuccessful test:
http://dl.dropbox.com/u/71121999/Ami...2020.57.44.jpg

One thing that does concern me is I popped a trace on the bottom of the mobo where it connects to a Gary socket pin and it pulled several centimetres off the board - I was able to solder it directly to the pin and gave it a coating of nail polish but am still unsure if that is enuf (time will tell i guess - might put up a pic tomorrow night).

I also tested all the socket pins with my multimeter to makes sure none of them where accidentally connected and got perfect results first time so happy with that.

If I cant fix this board I have discovered that getting hold of a Rev6a board is quite cheap from Europe and I should be able to transplant all the ECS chips and half the ram.
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Old 06-20-2012, 08:10 AM   #36
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Default Re: My 500+ Project

tin the pins on the IC to clean them

don't put massive blobs of solder on them though
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Old 06-20-2012, 03:16 PM   #37
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Default Re: My 500+ Project

Good idea, I'll try that.

Btw when looking at the pics can your trained eye see any pcb damage I need to repair?
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Old 06-20-2012, 04:38 PM   #38
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Default Re: My 500+ Project

Btw, I quickly took some pics of my socket soldering work (bit amateur - been a long while & I miss having a proper desoldeing station) and the trace I had to repair:

http://dl.dropbox.com/u/71121999/Ami...2007.59.53.jpg
http://dl.dropbox.com/u/71121999/Ami...2007.58.45.jpg
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Last edited by djos; 06-20-2012 at 04:41 PM..
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Old 06-20-2012, 05:17 PM   #39
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Default Re: My 500+ Project

That lifted trace, you might want to see where it starts and solder a wire link from source to socket pin.

Insert Gary and see if the machine boots. The trace might look solid and connected along its length but more than likely there is a break in it.

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Old 06-20-2012, 05:25 PM   #40
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Default Re: My 500+ Project

Quote:
Originally Posted by Azryl View Post
That lifted trace, you might want to see where it starts and solder a wire link from source to socket pin.

Insert Gary and see if the machine boots. The trace might look solid and connected along its length but more than likely there is a break in it.

Az
Good idea, thankfully I have some fine stiff wire lying around from a c64 reset switch mod. ATM I don't even get the insert disk screen likely due to the Gary chip feet needing more of a clean than I've given them.
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