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PostPosted: Sun Dec 09, 2018 2:29 pm 
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Joined: Sat Dec 08, 2018 5:37 pm
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Everything works as you'd expect... except I get gray screen. I see the red power LED. The Reset button resets. What could be going on?

Darryl


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PostPosted: Sun Dec 09, 2018 3:06 pm 
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Joined: Sun Apr 13, 2008 11:12 am
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Location: Seattle
Red power LED is on, but off while reset is pressed? Video draws solid-colored screen, but is off while reset is pressed?


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PostPosted: Sun Dec 09, 2018 4:33 pm 
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OK, update on this Nintendo NES. I now believe the lockout chip removal was successful.

I'd long suspected this NES of having power issues, so I just replaced the 7805. Cheap and easy repair. Then I did further testing with it. Still got the gray screen, but since the lid was off, I fiddled with the cart and as I raised and lowered the angle of the cart, it suddenly came to life! Not sure if the trouble is where the 72pin meets the mainboard or where the cart plugs in, but I suspect it's where the cart plugs in.

But the lockout mod seems successful. I should be play testing this thing later tonight after I get the 72pin issue worked out.


Darryl


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PostPosted: Sun Dec 09, 2018 8:14 pm 
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Joined: Sat Dec 08, 2018 5:37 pm
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Last update. I bent the pins on the 72pin connector and I have the NES working reliably now. Best of all, the lockout chip removal was a success! Thanks all.

If anybody else attempts this mod, it would be best to only change one thing at a time. Had I done that, I would not have been wondering which thing was causing my issue.

Darryl


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