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Old 06 October 2018, 03:19   #21
nexus
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just cause i hate buying button cells batts and i take care of stuff so im not worried if they leak i have to watch regular caps anyways
so in the long run super caps i had already were my choice and im sure they wont be leaking anytime soon

those varta batts came in both Ni-Cad and NIMH
so im sure the Ni-Cads leaked way before
i dont remember 100% but i think 1 is red and 1 is blue

though i will say using the coincell and carrier does help hide a lot of the PCB damaged lol

Last edited by nexus; 06 October 2018 at 03:27.
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Old 06 October 2018, 03:28   #22
esel
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sadly SuperCars are leaking too. Good example is the cap in the original XBox.
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Old 06 October 2018, 03:30   #23
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or Dreamcast
many things used super caps as batts
if i ever do anything different i would just do the AA batt deal and have it away from the boards
i have massive rechargeble stash of batteries lol kids
real purpose i even put anything there is to hide the PCB discoloring

Last edited by nexus; 06 October 2018 at 03:36.
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Old 06 October 2018, 04:21   #24
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pulled the last few ICs before final distilled water rinse. oh the things we find. never touched this chip ever. i dont even know what it's for but apparently the amiga never needed that pin.

https://www.amazon.com/clouddrive/sh...tries*=0&mgh=1

https://www.amazon.com/clouddrive/sh...T5MBI7UfjnHbBA

Last edited by nolunchman; 06 October 2018 at 04:34.
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Old 06 October 2018, 05:44   #25
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pulled the last few ICs before final distilled water rinse. oh the things we find. never touched this chip ever. i dont even know what it's for but apparently the amiga never needed that pin.

https://www.amazon.com/clouddrive/sh...tries*=0&mgh=1

https://www.amazon.com/clouddrive/sh...T5MBI7UfjnHbBA
looks like the pin was bent in a tad on installation might have been still making contact though as the way it was in the edge of the socket pin then bent to the other side and the pressure from other pins keepin it mounted to making contact

if you ever have to bend those type of pins back do it slowly or they can crack and snap off on you

Last edited by nexus; 06 October 2018 at 05:52.
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Old 06 October 2018, 09:59   #26
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the safe option is add a diode and lithium coin.
Even the coin cell batteries can leak. Uncommon, but I've seen it happen.
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Old 06 October 2018, 20:39   #27
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Originally Posted by nexus View Post
just cause i hate buying button cells batts and i take care of stuff so im not worried if they leak i have to watch regular caps anyways
so in the long run super caps i had already were my choice and im sure they wont be leaking anytime soon

those varta batts came in both Ni-Cad and NIMH
so im sure the Ni-Cads leaked way before
i dont remember 100% but i think 1 is red and 1 is blue

though i will say using the coincell and carrier does help hide a lot of the PCB damaged lol

you know how many people have said that to me and end up getting busy in life and putting their amiga in a closet or garage,only to have it leak lol.

A for the varta's yea nicad,nimh they all leak eventually. so why not just not use anything with leak potential,then u never have to worry about it ever again.
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Old 06 October 2018, 20:42   #28
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Even the coin cell batteries can leak. Uncommon, but I've seen it happen.

I have seen this with cheap chinese batts-unpure battery chemistry likely, stick with japan make panasonic or such.
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Old 06 October 2018, 20:43   #29
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Originally Posted by nolunchman View Post
pulled the last few ICs before final distilled water rinse. oh the things we find. never touched this chip ever. i dont even know what it's for but apparently the amiga never needed that pin.

https://www.amazon.com/clouddrive/sh...tries*=0&mgh=1

https://www.amazon.com/clouddrive/sh...T5MBI7UfjnHbBA

the things people do to these poor machines.. lol
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Old 06 October 2018, 21:11   #30
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yeah im always replacing caps so it just something im use to
nothing i have goes into the closet/ snake hole lol
everything is out and ready to be used

but you will never get around the capacitor plaque still going on today
so watching or waiting for caps to fail is a daily thing in this house

Last edited by nexus; 06 October 2018 at 21:20.
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Old 06 October 2018, 21:36   #31
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the small yellow capacitors on the motherboard...i dont have a cap meter, but some are reading open circuit and some have continuity. how do i know if it's bad/good
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Old 06 October 2018, 22:54   #32
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that isnt how you measure capacitors
and you dont measure them on the board
i would fix everything else before worrying about the caps
you have more serious issues
also those are ceramic caps i doubt they are bad

Last edited by nexus; 11 October 2018 at 20:54.
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Old 11 October 2018, 18:59   #33
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did some continuity checks on the FPU and discovered an open circuit on a corner pin close to the battery. go figure.

the aftermath:

https://www.amazon.com/clouddrive/sh...RM0ZoobU4mVc1f

Last edited by nolunchman; 12 October 2018 at 08:32.
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Old 12 October 2018, 22:09   #34
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and the cleanup

https://www.amazon.com/clouddrive/sh...QVt2jVBUThKxYE

https://www.amazon.com/clouddrive/sh...QEcHbKhmezw3fG
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Old 12 October 2018, 22:25   #35
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you might wanna buy a Andonstar microscope
they have decent cheap models thats $50 and under
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Old 13 October 2018, 03:08   #36
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good work!
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Old 17 October 2018, 21:14   #37
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good work!
thanks franchute

1 step forward and 2 steps back... i wan't feeling confident about jumpering the traces so i'm starting over. it may be better just to wire from the test points. won't look pretty but hopefully will have greater chance of success. i also desoldered the 40 pin socket closest to the battery for access (plus I burned it with the soldering iron when i was bridging the traces).



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Old 17 October 2018, 21:46   #38
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You can always leave the FPU alone for now. Jumper the mainboard not to use it and/or put in a 3630 and fix the essential stuff first.
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Old 17 October 2018, 22:18   #39
nexus
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just fyi the microscope will help you many ways besides seeing what you are doing
while soldering
it allows you too inspect every inch of the board which you may need to do
checking on solder joints traces etc etc
this type of work you really should have 1 could save you hours in finding out what is wrong
those i listed do many things like vid/snapshots/hdmi output/filters etc etc
even measurements
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Old 17 October 2018, 23:43   #40
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just fyi the microscope will help you many ways besides seeing what you are doing
while soldering
it allows you too inspect every inch of the board which you may need to do
checking on solder joints traces etc etc
this type of work you really should have 1 could save you hours in finding out what is wrong
those i listed do many things like vid/snapshots/hdmi output/filters etc etc
even measurements
yes i took your advice and bought a $50 digital scope on amazon
thanks nexus
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