repetto74 Posted March 3, 2018 Share Posted March 3, 2018 (edited) hi guys, I have an issue with a TI99/4A. I had to open it to apply some thermal paste on some chips but when mounting back and testing I had a garbled image. I was suspecting the metal shielding was shorting the extra RAM chip piggybacked on top of the TMS9900 (Tursi mod) but the suddenly all went black and now I just do not have a video signal at all. No black or blue screen but just "no signal". the power led is turning on but that's all. That's really stupid from me and now I do have fried something for sure. I have soldering skills and tools but need maybe someone to point me out where to look at now. What can be the main cause of a total absence of video output ? The only check I did was to ensure that the main PSU and the modulator were ok by plugging them to a working Ti99 and they do work. thanks Rick PS : I gave a check at the power supply PCB and do have correct voltages of +5V, -5V and +12V. Edited March 4, 2018 by repetto74 Quote Link to comment Share on other sites More sharing options...
repetto74 Posted March 4, 2018 Author Share Posted March 4, 2018 OK guys it is solved luckily!! It was just a bad contact with a chip. A good cleaning solved it. 2 Quote Link to comment Share on other sites More sharing options...
Like us on Facebook
Follow us on Twitter
AtariAge on Instagram
Watch us on YouTube
Chat on Discord
Recommended Posts
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.