Whats the problem with this Donkey Kong Machine

[itobandito]

I have took a pic of what my Donkey Kong machine is doing.  I am unsure if this is a monitor issue or if it's an issue with my Donkey Kong PCB board.  What do you think???

[Lutus]

Any audio coming from the speakers?  A buzzing?  If it does make noise can you play it blind?  Have you replaced any of the caps on the monitor (always a good idea). 

Does adjusting any of the pots do anything?

I am by no means a guru on monitors, but supplying this information may be helpful for the gurus who can help you out.

[Pac-Fan]

Horizontal hold aka Horizontal Frequency is out of whack.

Adjust the appropriate control on the monitor and it will resync.

If not, then try a cap kit as well.  Also you might try to adjust the horizontal positition knob on the PCB once you get the monitor back in sync to re-center the picture when you're done.

[RayB]

Cold solder joint on the sync pin can also cause that.

[itobandito]

Any audio coming from the speakers?  A buzzing?  If it does make noise can you play it blind?  Have you replaced any of the caps on the monitor (always a good idea). 

Does adjusting any of the pots do anything?

I am by no means a guru on monitors, but supplying this information may be helpful for the gurus who can help you out.

Yup there is a loud buzzing coming out of the speakers.  I get no game sound at all.  I haven't replaced the monitor caps yet because I wasn't sure if the problem was the monitor or the PCB.  You guys thinking its the monitor???

[itobandito]

Yeah messing with the pots does nothing.

[Lutus]

Did you reflow the solder to the sync pin? 

I am assuming that this is a Sanyo 20EZ since it is a Nintendo cabinet.  I just did a capkit on my Donkey Kong machine last night in fact.

The EZ in 20EZ does not stand for "easy" as far as cap kits are concerned.  Might as well reflow sync pin solder and do the cap kit while you have the monitor boards out of the cabinet.  Just take your time removing the monitor boards (you will have to also remove the transformer, audio amp, adjustment pot board, and neckboard) 


Not knowing whether it is the game board or the monitor the first step is to replace the monitor caps and reflow cold solder joints.  The reason for this is because it is $10 and a couple hours of labor.  If we can fix it with minimal effort then great.  If this doesn't fix it then at least your monitor now has a new cap kit!!!

Troubleshooting the gameboard opens a whole new can of worms.

[itobandito]

Yeah with the monitor being so old a recap kit will eventually be needed anyways so I am going to try that route first.

[BMW Z1]

My monitor does that when the switch for Horizontal or Vertical monitor mounting is in the incorrect position. Have you check that the switch is set for vertical picture?

[itobandito]

My monitor does that when the switch for Horizontal or Vertical monitor mounting is in the incorrect position. Have you check that the switch is set for vertical picture?

  When you say switch, you mean the dipswitches on the board?  I checked that last night and it was in the correct position.