Dragon's Lair Fans - Arcade Lifestyle

General Chat => Technical Area => Topic started by: RAPBIGICP1 on September 14, 2010, 02:51:20 PM

Title: need diagnosis help (DK jr video)
Post by: RAPBIGICP1 on September 14, 2010, 02:51:20 PM
I'm in need of a little help diagnosing a video problem with my recently acquired Donkey Kong Jr. I'm having rolling/scrolling lines of video that are mostly blue.  I've cleaned and re-seated 2E & 2F.  I've ordered a cap kit, but it won't be here until tomorrow.  I'm hoping the cap kit will do it, but I'd like to be prepared if it doesn't.  There's a 2:19 video here:
http://www.youtube.com/watch?v=H7vwZJ28Juw

Any and all help appreciated!
& Pictures:

(http://www.flickr.com/photos/lanceb/4989325175/)
(http://www.flickr.com/photos/lanceb/4989932292/in/photostream/)
(http://www.flickr.com/photos/lanceb/4989324965/in/photostream/)
(http://www.flickr.com/photos/lanceb/4989932094/in/photostream/)
Title: Re: need diagnosis help (DK jr video)
Post by: Laschek on September 14, 2010, 03:57:14 PM
Did you try to adjust sync? Is it an original board in an original cab with an original Nintendo type monitor?
Title: Re: need diagnosis help (DK jr video)
Post by: RAPBIGICP1 on September 15, 2010, 07:54:59 AM
Quote from: Laschek on September 14, 2010, 03:57:14 PM
Did you try to adjust sync? Is it an original board in an original cab with an original Nintendo type monitor?
No - (How?)
Yes
Yes
Yes
Title: Re: need diagnosis help (DK jr video)
Post by: Laschek on September 15, 2010, 11:02:19 AM
Find the V-Hold (vertical) and H-Hold (horizontal) pots on the monitor chassis and try to "catch" the rolling picture. Beware, high voltage!
I don't know that much about those Nintendo monitors, don't some of them have a switch to choose between positive/negative sync? If so, try that one as well.
Title: Re: need diagnosis help (DK jr video)
Post by: RAPBIGICP1 on September 16, 2010, 09:31:07 AM
Pulled the monitor today.
Yanked (carefully) the boards out of it, and capped the Audio Amp as well as the main monitor board.  I also did the neck board pots, and extension board pots.
Hopefully I can get it all back together and start adjusting/tweaking soon... and then playing!!!!  *crosses fingers*
Title: Re: need diagnosis help (DK jr video)
Post by: RAPBIGICP1 on September 16, 2010, 05:26:14 PM
Cap kit done, monitor re-installed.  After some minor adjustment, it looks really good!!  Just one last bit to work out.  Any suggestions on how to fix?

(http://www.flickr.com/photos/lanceb/4996240860/)

Hmmm....  it doesn't appear as though there is a picture up there ^
Well, if you can see it, great.  If not, it can be seen here:
http://www.flickr.com/photos/lanceb/4996240860/
but basically, the left side of the screen (about a half inch or so) is being pulled straight down by about an inch and a half (4cm?).
It's not horrible, but I'd like to do away with it.

Suggestions?

Thanks!