lucifershalo Posted April 27, 2019 Share Posted April 27, 2019 Hello, got a new problem just now after some min of play (3-4) it went to a black screen and I have to switch it off and back on to make it work but the problem remains, any idea what it could be, it is refurbished, improved console by Yurkie thanks Quote Link to comment Share on other sites More sharing options...
+nanochess Posted April 27, 2019 Share Posted April 27, 2019 Interesting. I've exactly same problem in one of my consoles. I'm going to try to solve it in some weeks. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted April 28, 2019 Share Posted April 28, 2019 Does the rest of the system seem to continue when the screen goes black? (gameplay, sound, etc)? Is the heat sink still firmly attached to the video chip? Quote Link to comment Share on other sites More sharing options...
lucifershalo Posted April 28, 2019 Author Share Posted April 28, 2019 No... Everything stops... Maybe the console goes off... Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted April 28, 2019 Share Posted April 28, 2019 Does sound die completely, or just get stuck on the last note(s) that it was playing? Quote Link to comment Share on other sites More sharing options...
lucifershalo Posted April 29, 2019 Author Share Posted April 29, 2019 sound off also video, sound all stop and goes black screen silent Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted April 29, 2019 Share Posted April 29, 2019 (edited) Can I assume you also tried reset, to no avail? Do you have the capability and equipment to test internal connections? The first thing to check is power. If you're really careful, you can check the voltages from the expansion port. The bottom leftmost pins are -5V, +5V, and +12V. The wide pin on the top left is the ground pin. Just don't short a power pin to the copper springy guides or to another pin. Stick a post-it note or something on the guide to insulate it. If the power is good, the problem is likely to be in the oscillator circuit. Possible failure points include the crystal itself (sometimes they can quit oscillating until spiked again, say, by turning the system off and back on), U22 (two logic gates that the oscillator uses), U8 (the clock divider) and Q2 (apparently a clock amplifier). Edited April 29, 2019 by ChildOfCv Quote Link to comment Share on other sites More sharing options...
lucifershalo Posted April 30, 2019 Author Share Posted April 30, 2019 reset deosnt work I have to switch it off and back on I will try another power supply Quote Link to comment Share on other sites More sharing options...
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