Just decided to resurrect my Amiga500's

ceedy · 17 February 2011, 19:37

I got small pile of A500's. 2 500 and one 500 +.

Would like to get the plus going but presently its not too well.
Its been up in the loft for quite a few years.

It powers up ( well the LED lights

) . the Floppy drive light flickers frantically and the screen is white with a lot of flickering zig zag lines on it .

On pulling it to bits the battery has leaked and lifted a lot of the green varnish around that area.
I've cleaned it up a bit .

I know its hard to diagnose just from a description but can anyone give me clue where to start.

the 500's work ok .. so would happy to make /repair the plus from parts nicked off the others ?

heres hoping ...

Chris

PS Still got a larger pile of working 1200's to keep me happy

8bitbubsy · 17 February 2011, 20:03

Need more pictures of areas with "green alien acid venom" (aka. battery acid)!

First use something like lemon juice to neautralize the green corruption, then add flux + new shiny solder. Some components might break off because of the attack so you might need to get new ones.

ceedy · 17 February 2011, 20:34

Its now lemon fresh ...

The last pic were with a 1.3 microscope camera.. now done some with 5 mp camera.

hope there are not too large..

The only damage is that in the photo's , nowhere else .. and nothing at all on the PCB underside.
Can't see any component legs broken thro'.
just the copper with pitting .
No nasty smells from any Caps. ?

Piccy..

its an 8A version board dated 91/92

Chris

8bitbubsy · 17 February 2011, 21:08

I think these two areas are damaged as far as I can tell (the diode pin is definitely broken off):

bebek · 17 February 2011, 21:37

Quote:

Originally Posted by 8bitbubsy

I think these two areas are damaged as far as I can tell (the diode pin is definitely broken off):

The diode is in the right place, that is how it is connected in A500+

You have to check with a multimeter all tracks close to the battery solder point as the damage can be not visible

ceedy · 17 February 2011, 21:51

Just been right in there with a Eye glass and microscope

.diode definately OK and not broken .

can't see any tracks gone in the other area either

the only place where the copper has gone is is a patch on the large ground plane area.

Will bridge that with some wire just in case but all the tracks ring out as ok .. so looks like its isn't as bad as it looks pcb wise.

Now will have to find a coin battery holder off something to pop in place

Well yippee.... just popped on the keyboard

A520 single video cable powered up and ...

A boot Screen!!! ... so a great improvemtn on 3 hours ago!! .. .off to pop. in a battery and varnish over the PCB bits.

No to find out if the floppy and ram expansion are ok .

thanks for the assistance..

Mind you I'm bound to be back with some other problem

take care all

Chris

PS ...Now to try and get a picture on the big Toshiba LCD ??

17 February 2011, 19:37	#1
ceedy Old-Amiga-Git Join Date: Feb 2011 Location: Somerset , in the UK Posts: 175	Just decided to resurrect my Amiga500's I got small pile of A500's. 2 500 and one 500 +. Would like to get the plus going but presently its not too well. Its been up in the loft for quite a few years. It powers up ( well the LED lights ) . the Floppy drive light flickers frantically and the screen is white with a lot of flickering zig zag lines on it . On pulling it to bits the battery has leaked and lifted a lot of the green varnish around that area. I've cleaned it up a bit . I know its hard to diagnose just from a description but can anyone give me clue where to start. the 500's work ok .. so would happy to make /repair the plus from parts nicked off the others ? heres hoping ... Chris PS Still got a larger pile of working 1200's to keep me happy Last edited by ceedy; 17 February 2011 at 19:46.

17 February 2011, 20:34	#3
ceedy Old-Amiga-Git Join Date: Feb 2011 Location: Somerset , in the UK Posts: 175	Its now lemon fresh ... The last pic were with a 1.3 microscope camera.. now done some with 5 mp camera. hope there are not too large.. The only damage is that in the photo's , nowhere else .. and nothing at all on the PCB underside. Can't see any component legs broken thro'. just the copper with pitting . No nasty smells from any Caps. ? Piccy.. its an 8A version board dated 91/92 Chris Last edited by ceedy; 17 February 2011 at 21:01.

17 February 2011, 21:51	#6
ceedy Old-Amiga-Git Join Date: Feb 2011 Location: Somerset , in the UK Posts: 175	Just been right in there with a Eye glass and microscope .diode definately OK and not broken . can't see any tracks gone in the other area either the only place where the copper has gone is is a patch on the large ground plane area. Will bridge that with some wire just in case but all the tracks ring out as ok .. so looks like its isn't as bad as it looks pcb wise. Now will have to find a coin battery holder off something to pop in place Well yippee.... just popped on the keyboard A520 single video cable powered up and ... A boot Screen!!! ... so a great improvemtn on 3 hours ago!! .. .off to pop. in a battery and varnish over the PCB bits. No to find out if the floppy and ram expansion are ok . thanks for the assistance.. Mind you I'm bound to be back with some other problem take care all Chris PS ...Now to try and get a picture on the big Toshiba LCD ?? Last edited by TCD; 18 February 2011 at 07:53. Reason: Back to back posts merged. Use the edit function.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Amiga 2000 HD: Time to resurrect :)	Analog-X64	support.Hardware	3	08 November 2012 15:41
So I've decided to invest in an A1200...	Spectre	New to Emulation or Amiga scene	5	18 February 2009 17:37
looking for amiga500, 600	albino	MarketPlace	0	01 June 2008 21:37
Softsynth Amiga500(+)	cosmiq	request.Apps	15	04 May 2003 22:20
Problems with my amiga500... Help me !	timkar	Amiga scene	2	04 February 2003 20:45

17 February 2011, 20:03	#2
8bitbubsy Registered User Join Date: Sep 2009 Location: Norway Posts: 1,715	Need more pictures of areas with "green alien acid venom" (aka. battery acid)! First use something like lemon juice to neautralize the green corruption, then add flux + new shiny solder. Some components might break off because of the attack so you might need to get new ones.

17 February 2011, 21:08	#4
8bitbubsy Registered User Join Date: Sep 2009 Location: Norway Posts: 1,715	I think these two areas are damaged as far as I can tell (the diode pin is definitely broken off):

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)