belek94
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Post by belek94 on Dec 26, 2018 22:24:35 GMT
Hello,
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)
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Post by zyrobs on Dec 26, 2018 22:38:37 GMT
If the TOP202YAI was the problem, the console wouldn't boot into games.
Have you tried using a different video cable? Plenty of RGB cables are cheap crap with no shielding and a lot of video issues.
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belek94
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Post by belek94 on Dec 27, 2018 8:47:49 GMT
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Post by zyrobs on Dec 27, 2018 11:06:33 GMT
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.
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Post by zyrobs on Dec 28, 2018 1:37:52 GMT
Note that if you don't get that buzzing/booting issue, then it's possible that the PWM chip (top202yai) is fine, and it's the caps and EMI filters on the video encoder that got spent.
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belek94
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Post by belek94 on Dec 28, 2018 8:24:55 GMT
You mean in the motherboard ?
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belek94
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Post by belek94 on Jan 1, 2019 11:36:26 GMT
in the power supply bloc I just noticed that one cap seems to have flowed in the board See there That could be our man ? EDIT : or perhaps it's only some glue to stick the cap properly
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Post by zyrobs on Jan 1, 2019 17:21:21 GMT
That's just glue. If the power supply was the main problem, then you'd have system instability problems on top of bad video.
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belek94
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Post by belek94 on Jan 2, 2019 13:57:48 GMT
In another French forum a guy has encountered the same issue and replacing capacitors c7, c8, c9 in the PSU worked for him I will try this fix before going further
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belek94
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Post by belek94 on Jan 5, 2019 18:06:57 GMT
I replaced capacitors c7, c8,c9 and it works properly ! No more horizontal lines:-)
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