Author Topic: TI-82 STATS does not power up properly anymore.  (Read 330 times)

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Offline Refrigerator

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TI-82 STATS does not power up properly anymore.
« on: October 06, 2018, 06:44:17 pm »
My precious TI-82 has been having problems powering up for about a year now, it would take a few tries to get it running and sometimes it would even display "MEM CLEARED", after one good power up it turns on without problems if i don't leave it off for too long.
Also most of the time after a difficult power on it has the contrast way up so i have to re-adjust it :-//
But now i pulled it out to do some TL431 resistor divider calculations and it doesn't power up anymore  :-BROKE
Has anyone had this happen? Could it be a simple fix?
BTW, the batteries are good.

PS: while writing this post i gave it another try and it powered up :phew: and the contrast is way up as well.

Just started a blog at http://brimmingideas.blogspot.com/ . Not much in it as of now but more is sure to come :)
 

Offline shakalnokturn

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Re: TI-82 STATS does not power up properly anymore.
« Reply #1 on: October 09, 2018, 10:34:31 am »
...
BTW, the batteries are good.
...

This may sound a stupid question of course: You have checked the backup battery too?
Otherwise check PCB for battery corrosion.
 

Offline Refrigerator

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Re: TI-82 STATS does not power up properly anymore.
« Reply #2 on: October 12, 2018, 02:26:05 am »
I had it replaced before the other one went bad but i figured it wouldn't hurt but the next day i had a "MEM CLEARED" and i knew it had nothing to do with the batteries.
The one buttoncell that i replaced was still like new so i keep it in the battery tray as a spare.
Just started a blog at http://brimmingideas.blogspot.com/ . Not much in it as of now but more is sure to come :)
 


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