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Atari 1200XL powers up - No LED or keyboard activity present...

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#26 flashjazzcat OFFLINE  



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Posted Fri Aug 10, 2018 5:29 AM

Here's the whole procedure from start to finish:


#27 kheller2 OFFLINE  



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Posted Fri Aug 10, 2018 6:59 AM

it's tedious but is indeed absolutely needed to make sure that tape stuff is out of there, just be super careful doing it... and by all means make sure the conductive stuff is mixed up really well... bleed through makes it appear as though it was a little thin... this is a game of mils....  so clean with a good build up is key
if it doesn't get the job done after that , one last coating of the fingers right up to the white might be in order....

Doc is right in about those fingers. I repaired a prototype1200XL once and that keyboard was a bear to separate the mylar from the PCB without total enilation. I had to create new fingers and made sure they connected to the existing traces on the mylar. A multimeter showed me that one still wasn making contact. After that was fixed it worked perfectly.

YMMV and of course a new best mylar is the easiest way to go. Not much if anything else goes wrong on those 1200s. Jumper the 5v line to the proper SIO pin and you are good to go.

#28 _The Doctor__ OFFLINE  

_The Doctor__

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Posted Fri Aug 10, 2018 9:41 AM

as a read the thread I didn't any hint that making sure the whole thing was warm enough to help the adhesive leave go when pulling up the mylar... FJC's video is a good thing to watch also... as he posted it above, I highly suggest getting to the good part and watching it. Very practical!

Edited by _The Doctor__, Fri Aug 10, 2018 9:43 AM.

#29 flashjazzcat OFFLINE  



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Posted Fri Aug 10, 2018 11:03 AM

You don't have to wait too long. I start heating the board about five minutes in. :)




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Posted Fri Aug 10, 2018 11:37 AM

Congrats on your new 1200XL! They are really beautiful. Use it for a few days and it'll grow even more on you and when you go back to the 800XL it will seem small.


Interestingly, my reason for getting this one was to complete my XL line (600XL, 800XL, 1200XL - US releases), but was not wanting to spend the kind of money people were asking. This was a bit more than I wanted to spend, but took a chance on ebay (sold as is - untested) with a buy it now and am pleased with the results so far even with the mylar issue.


My main unit is a 600XL with DIN Video mod and 512k ram expansion due to the size and top loader. I prefer smaller units, but absolutely LOVE this 1200XL now that it's in my possession.

Edited by NISMOPC, Fri Aug 10, 2018 11:38 AM.

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