How to check voltages on Nintendo power supply

[dweebs0r]

I have an original Donkey Kong Jr. that I just picked up on craigslist.  When I first picked it up, when I would turn the game on it would go through a boot up sequence and then freeze.  Talked to a buddy of mine who said, "Just like any arcade game - verify voltages, clean connectors, reseat
socketed chips.  Failing that, it's probably a board issue."

I ordered another pcb, swapped it in and it boots right up and plays like it supposed to play.

So if I want to check the voltages of the power supply, what are the voltages supposed to be in order for me to verify them on an original Nintendo power supply?

Next problem, the game boots and plays, I replaced the joystick with a NOS version from Mikes Arcade, but after 10 minutes or so the monitor flickers on and off very briefly as if its losing power.  The monitor looks great.  The colors and bright and vivid.  Called a local electronics place (that has some experience with arcade repair) and he said I needed to replace the monitor.  Really??  It looks great.  Its not fixable??
I bought a Nova matrix LED light to replace the marquee light.  Is there any where I can run 12 volts from to power this dude?


So my questions are:

1.  What are the normal expected voltages from a Nintendo machine I should look for
2.  Any ideas about the monitor?
3.  12 volts from anywhere?

Thanks,
-Dweebs

[mlalena]

For the power supply, you might not need to know the desired voltages to check it. Sometimes for systems that start fine and then fail, the voltage on the power supply drops after it heats up, when there is a heavy load...
Disconnect the power supply from system and test it with no load. Then test it as the system fails.
Note: A cheap digital volt meter might not work here because it wont be able to record a quick dip in voltage.

[dweebs0r]

There seems to be some kind of a short somewhere in the neck of the monitor.  After the monitor has been on for a while, I hear a little pop, and the screen flickers momentarily.
Everything else is working perfectly.  Any ideas from anyone on the monitor?

[mlalena]

I don't know how to diagnose monitor problems, but I will give you the standard warning if you weren't already aware...

CRT monitors store a lot of energy and even when not plugged in, a tube monitor can kill you. The neck of the monitor (where you hear the pop) is basically the area you want to stay away from. There are ways to discharge monitors so that they can be repaired, but I am no expert on this subject. Either do more research or find some help if you intend to work on the monitor.