Bamse Posted June 19, 2018 Share Posted June 19, 2018 (edited) So, I had the same problem again last night, it happened after I swapped power cable over (I've bought a longer one). It started with the sprites becoming scrambled and then all the graphics scrambling. The game still runs its just scrambled. Earlier I had cleaned the contacts in the cartridge slot but it had been fine since. Tried a few different games which I knew had worked previously but they were all scrambled. Took the INTV apart cleaned it out again blew it out with the compressed air put it back together and it worked fine and has worked fine since. Any ideas as to what could be causing this? Edited June 19, 2018 by Bamse Quote Link to comment Share on other sites More sharing options...
mr_me Posted June 19, 2018 Share Posted June 19, 2018 Is it a problem that starts once the Intellivision gets warm with use, and goes away after it cools down? Feel free to attach a photo of the screen showing the problem. Visually inspect the mainboard for problems e.g. bad solder. Quote Link to comment Share on other sites More sharing options...
Bamse Posted June 19, 2018 Author Share Posted June 19, 2018 No, the temperature of the Inty seems to have no effect on it. Left it on for an hour or so just to make sure. Will take a pic if and when it happens again. I've seen people on YouTube with similar symptoms curing it by changing one of the chips of the board but their fault is constant where as mine is not. Quote Link to comment Share on other sites More sharing options...
carlsson Posted June 19, 2018 Share Posted June 19, 2018 I wonder about the voltages from the internal power supply. I haven't studied the schematics but would assume you've got some -5V or -12V somewhere supporting the RAM chips. If that voltage is partially failing, it could be one of many possible causes you only get garbage. Or does that apply to title screens using the GROM as well? 1 Quote Link to comment Share on other sites More sharing options...
Bamse Posted June 19, 2018 Author Share Posted June 19, 2018 As far as I can tell power seems to be fine although saying that, both times the fault happened it was following me switching the power cables. I wonder is power spikes might cause this effect? Not sure of the quility of power supply in my place, the wiring isn't new by any means. Quote Link to comment Share on other sites More sharing options...
Bamse Posted June 19, 2018 Author Share Posted June 19, 2018 The title screens were fine on both occasion too. Quote Link to comment Share on other sites More sharing options...
HunterZero Posted June 21, 2018 Share Posted June 21, 2018 Could be a dirty IC socket causing intermittent connection issues on a data line pin on the STIC chip. Cleaning and resocketing the STIC would probably fix it. Could also be an issue with the reliability of the "blue jumper wire" connector. If it's working now, I wouldn't touch it unless it does it again. You might find that bumping the console could cause the issue to reoccur, which could imply there's a bad connection or cracked/dry solder joint somewhere. - J 1 Quote Link to comment Share on other sites More sharing options...
Bamse Posted June 21, 2018 Author Share Posted June 21, 2018 Thanks. As you say, I'll leave it for now as its working fine. Thanks for your insights, they will come in handy if it reoccurs. Quote Link to comment Share on other sites More sharing options...
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