DK 4-board locking up

mecha

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my DK will lock up some days and others it will work fine. it's operated in a game room, it's probably on 10 hours a day.

it's got a switching power supply, and I've cleaned every socketed chip in it. some of the chips had heavy corrosion on them, I used sandpaper to get the legs nice and shiny. game worked fine for a few weeks, then was back to freezing again.

if it helps any, it will freeze on the high score screen, and sometimes it will have the scrambled multi-colored letter pattern.

additionally, what should I be looking for in terms of +5 at the boards? could it be the +5 is a little too low?
 
additionally, what should I be looking for in terms of +5 at the boards? could it be the +5 is a little too low?

Yes, it could definitely be low. Check the power at the boards, to verify that they're both getting a good 5v.

You say switching power supply - is it a newer style switching power supply, or is it the original Nintendo power supply (which is a switcher too). The original supplies are good, but well known for needing caps about this point in their lives.

-Ian
 
Yes, it could definitely be low. Check the power at the boards, to verify that they're both getting a good 5v.

You say switching power supply - is it a newer style switching power supply, or is it the original Nintendo power supply (which is a switcher too). The original supplies are good, but well known for needing caps about this point in their lives.

-Ian

shit, you're right. lol

it's a regular screw terminal one. I mean, I have one of those Nintendo ones laying around, but the harness has already been molested now you know. lol

I wanna say it was like 5.2 AT the power supply, but given the 4 boards and the ribbon cables, it might be fairly diluted on the other end. I'll try testing a rom or something.
 
I wanna say it was like 5.2 AT the power supply, but given the 4 boards and the ribbon cables, it might be fairly diluted on the other end. I'll try testing a rom or something.

I would start by checking the voltages at the boards themselves, not the power supply. I wouldn't think there would be any problems with the ROMs, since the board runs fine when it runs, although it is theoretically possible you've got a flakey one. But still, I'd start by checking voltages before you start pulling and checking ROMs.

-Ian
 
yeah, I meant using one as a test point.

was tinkering with my MK2 tonight. finally resolved my age-old problems with it.
 
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