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Tech: Missile Command Video Problems

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c-man

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Dec 28, 2009, 10:09:28 AM12/28/09
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Hi -

Had a working MC PCB...still works and plays with no test errors, but
large "blocks" of screen area down the center of the screen (left to
right) now have improper blocks of color or white amid the game
graphics. Shows up both during the game, and in test. Looks like
missile "explosions" that appear and then don't go away.

Any thoughts on the cause? Just would like some educated guesses on
the faulty chip before I start trying to replace things. Have pics of
the screen if that could help diagnose. Thanks in advance for any
help!

Carl

Craig Yarbrough

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Dec 31, 2009, 1:01:05 AM12/31/09
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I'd start with the DRAM Picture Output Enable and the Picture Bit
Converter. Although I've seen similar problems and chased them back to
the address decoding circuit.

I do work on these if you find you need help.

c-man

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Jan 1, 2010, 9:30:22 PM1/1/10
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>
> I'd start with the DRAM Picture Output Enable and the Picture Bit
> Converter. Although I've seen similar problems and chased them back to
> the address decoding circuit.
>
> I do work on these if you find you need help.

Thanks for the tips...what do you charge for repair?

Craig Yarbrough

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Jan 2, 2010, 10:23:42 AM1/2/10
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Emailed you.

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