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John's Arcade Forum - Classic Arcade and Pinball Collecting and Restoring Discussion Forum - RETRO MAME - Nintendo Vs Forum > Tech and Marketplace > I need help with my game! - Technical Discussion (Moderator: AgentX) > Williams Defender Problem
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Author Topic: Williams Defender Problem  (Read 3241 times)
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Depeche
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« on: February 22, 2016, 09:41:16 pm »
Hello,

Not the best first post and straight to the point... I didn't "measure twice and cut once" when making my 4116 to 4164 adapter and I jumped the pins on the power supply side and pumped +12V through pin 7 to the 4164 ram chips and whatever else pin 7 supplies.  So knowing what was screwed up, what did I fry besides the Ram and possibly the +5V power supply circuit as the +5 LED is no longer lit?

... putting on my flamesuit now  Cry
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iankellogg
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« Reply #1 on: February 23, 2016, 08:44:03 am »
depends on how long you left it on.

i would be surprised if you didn't short out most of the board.
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Depeche
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« Reply #2 on: February 23, 2016, 01:03:39 pm »
about 20-30 seconds  Embarrassed
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