Dragon's Lair Fans - Arcade Lifestyle
General Chat => Technical Area => Topic started by: petieken on February 25, 2009, 08:38:26 PM
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Maybe one of the tech guys here can help me with my Sega System 16A Shinobi pcb. When I first plugged it in through my System16 to Jamma converter I got nothing. After fiddling with the connectors I got scrambled blocks all over the screen. A reboot didn't solve anything.
I decided to remove, clean and reseat all removable ic's. Now when I power up the game I get nothing for about 1~2 minutes then the game boots normal and everything works, occasionally the screen jumps for a fraction of a second.
Is there anyone who knows where I should be looking to solve the problem?
Kev
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Now when I power up the game I get nothing for about 1~2 minutes then the game boots normal and everything works, occasionally the screen jumps for a fraction of a second.
Looks like a power supply problem. It gives too low voltage. I got a similar problem with my After Burner. The 5V given by the power supply was a little bit too low, and I just have to turn the 5V pot to adjust the voltage, and my problem was solved :)
It's maybe a similar problem ?
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Ok, I'll check the voltage. It's really weird, I powered it up again today and after about 2 minutes I get the game on screen but it looks like the sync doesn't lock so it jumps vertically and after 2 more minutes the picture is steady.
Tomorrow I'll check the voltage first ;)
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I measured the voltage at the board input (connector) and it reads 5.03V. I also measured at the processor, ram & eprom and all read 4.92V so you're probably right Bruno ;), my voltage is way to low. My current supply is fixed, so I can't regulate it to give my board a little more juice. My order at Japandeal includes a new power supply, so I have to wait a few days for that power supply to arrive.
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I measured the voltage at the board input (connector) and it reads 5.03V. I also measured at the processor, ram & eprom and all read 4.92V so you're probably right Bruno ;), my voltage is way to low.
No, your power supply is just fine, replacing it with another one won't fix this behavior.
Seems like a bad capacitor issue, check all electrolytic caps on your board. especially in the video and reset section circuitries.
Matteo