Trying to get some help for a Sega Saturn v1 (power supply attached to the upper case). I'm having scrolling horizontal lines everytime i try to play a game. Not only when I stop playing and restart the console after 30 min. It happens every time. I'm using a true rgb cable on a 4k tv through a hdmi converter. I tried a different tv and I tried to plug directly the rgb cable to another tv but same issue. I read a lot of posts and in most of cases people advise to change the TOP202yai component. I wonder if it will fix my issue as in my case it happens every time (not only after 30 min) . Not sure if both issues have the same root cause.
Looking forward for your feedbacks (Sorry for my bad English)
When the TOP202YAI goes bad, the system will start giving a buzzing/whining noise and one of the voltages goes bogus, preventing games from booting. At least that's what it does for me. On top of the horizontal lines crawling around.
I replace that chip out of habit now because it ALWAYS ends up causing issues. So you might want to fix it as well if for no other reason but preventive maintenance.