Jump to content
IGNORED

TI-99/4A from 1980, had a TI-99/4 psu and board help


Recommended Posts

Hi everyone and thanks for having a look at this post. I've had my ti994a since it was initially released back in 1980. Never had a problem with it recently eye spotted too good of a deal to pass up on eBay and bought a second ti994a both models are the black and silver kind for 20 bucks with box complete too good to pass up. From looking at it, I saw no differences with this new TI from ebay and my 1980 original. I decided to fire up my original ti994a but the power supply I had was put away somewhere so since the ti I just got off eBay seemed exactly similar including the power supply which was the old wart version I connected it powered it on and my computer worked for about a second then went to a black screen rebooted it a few times sometimes got to the initial screen other times started to get garbage on certain games like Donkey Kong where the text would be messed up I dismantle my machine to take a look at it to see that the inside power motherboard was actually from a ti994! computer my guess is this was an early one and then we were using anything they could to keep costs down but basically the power supply I had was a 16 volt where are the newer ti994a for 18 volt so obviously I screwed something up has anyone had any experience in these matters. I purchased f18a thinking maybe I tried video Ram or the video processor but it made no difference. I did notice a lot of bad solder joints so I repaired every single bad solder joint I saw power the machine on with the original proper power supply and the two I worked about a minute perfectly but now all I get is a black screen with the initial sound beep.

Link to comment
Share on other sites

Hi Moonlight .... sounds to me like you need to get a 4A motherboard ... reason I say that and not just another console is because from looking at your 1980 4A it is actually a Tan colour rather than silver, like the 994, but with the 4A keys right? .... that IS a rare beast. Keep the console! :)

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...