DK Jr.-White Screen...What To Check First?

[Guest]

Archived from groups: rec.games.video.arcade.collecting (More info?)

I picked up a real nice Donkey Kong Jr. last week, my first Nintendo
game, but it has the infamous white screen and buzzing sound. When I
searched Google I noticed people recommending the following fixes...

Check voltages from PS
Recap the monitor
Recap the sound board on the monitor
Rebuild the power supply
Get new rainbow power cables

Is there an easier/cheaper way to narrow down this common problem or
are these all inter-related components that must ALL be gone through to
diagnose and fix the white screen?


Thanks for suggestions.
-Rik

 

[Guest]

Archived from groups: rec.games.video.arcade.collecting (More info?)

No, the problem is not necessarily with ALL of these things. You can
do it a step at a time and see if you get anywhere.
I'd start by checking voltages from the PS and on the boards. Check
fuses too. If your voltages are way off, then you're looking at some
Power Supply work.
I'm no Donkey Kong expert, in fact I've never owned one or worked on
one, but I'd say the fact that you're missing sound is an indication
that it's more than just a cap job on the monitor.
Anyways, I'd jsut take it a step at a time, and I'd begin by testing
everything. NO sense in needlessly replacing a ton of things right
now.

>
> Check voltages from PS
> Recap the monitor
> Recap the sound board on the monitor
> Rebuild the power supply
> Get new rainbow power cables
>

 

[Guest]

Archived from groups: rec.games.video.arcade.collecting (More info?)

I guess you have no sound...

--
AF

<shelnrik@gte.net> wrote in message
news:1119988346.943510.136650@g14g2000cwa.googlegroups.com...
> I picked up a real nice Donkey Kong Jr. last week, my first Nintendo
> game, but it has the infamous white screen and buzzing sound. When I
> searched Google I noticed people recommending the following fixes...
>
> Check voltages from PS
> Recap the monitor
> Recap the sound board on the monitor
> Rebuild the power supply
> Get new rainbow power cables
>
> Is there an easier/cheaper way to narrow down this common problem or
> are these all inter-related components that must ALL be gone through to
> diagnose and fix the white screen?
>
>
> Thanks for suggestions.
> -Rik
>

 

[Guest]

Archived from groups: rec.games.video.arcade.collecting (More info?)

Only if a buzzing noise from the speaker counts as sound.

 

[Guest]

Archived from groups: rec.games.video.arcade.collecting (More info?)

Keep in mind that if you DONT have logic operation you WILL have a white
screen. The Nintendo games of that era were negative outputs to the monitor.
Since it doesn't sound like your getting game sound I'd say your missing +5
or have a bad boardset. You may also have bad caps within the power supply
so you will be able to read +5 from the supply but the AC ripple might be
high enough to keep the logic board from operating. You'll need a scope or a
good DMM to check for AC leaking into the DC supply.

Matt

<shelnrik@gte.net> wrote in message
news:1119988346.943510.136650@g14g2000cwa.googlegroups.com...
>I picked up a real nice Donkey Kong Jr. last week, my first Nintendo
> game, but it has the infamous white screen and buzzing sound. When I
> searched Google I noticed people recommending the following fixes...
>
> Check voltages from PS
> Recap the monitor
> Recap the sound board on the monitor
> Rebuild the power supply
> Get new rainbow power cables
>
> Is there an easier/cheaper way to narrow down this common problem or
> are these all inter-related components that must ALL be gone through to
> diagnose and fix the white screen?
>
>
> Thanks for suggestions.
> -Rik
>

 

[Guest]

Archived from groups: rec.games.video.arcade.collecting (More info?)

UPDATE: DK Jr Fixed
Yep, turnd out to be +5 volts (a lack of it) coming from the PS.
Bought a switcher kit from Arcadeshop and now it works fine.
Monitor flickers occasionally though.

Thanks all for the replies.
-Rik