Build Your Own Arcade Controls Forum

Main => Monitor/Video Forum => Topic started by: Mani on June 17, 2003, 12:32:34 pm

Title: top of arcade monitor distortion
Post by: Mani on June 17, 2003, 12:32:34 pm

Hi!

I have a WG 25" monitor mounted in a MK2 cab that is showing some distortion at certain resolutions. The top 2 inches of the screen are "compressed", to the point that the scanlines have merged. There is a pretty clear border where the scanlines "decompress" and the rest of the display is perfect.

Could this be caused by electrical interference? Sometimes the distortion at the top of the screen gets worse when I'm moving around the pc in the cabinet. However I can still observe this video distortion with the PC turned off and my I-Pac disconnected from the monitor.

Sometimes when turning on the arcade machine or switching resolutions, there is no apparent distortion; but then it slowly reappears after a few seconds or minutes.

I've read in FAQ's that monitor distortion at the top of the screen is indicative of a faulty cap kit.

I'm (justifiably?) terrified of electrocution so I'm not willing to tinker with the monitor myself. How much should I expect to pay a monitor technician (from a local arcade shop/distributor) to come by and take a look at and fix my monitor?

Sorry for the long-winded post, but I wanted you all to be armed with the most information. I'm desperate to repair my baby!!  :'(

-Mani

Title: Re:top of arcade monitor distortion
Post by: mpm32 on June 17, 2003, 01:12:58 pm

Unsheilded speakers near the top of the monitor?  

Title: Re:top of arcade monitor distortion
Post by: Mani on June 17, 2003, 02:12:46 pm

woah! it could definately be that. although i'm quite sure they are shielded (its a decent yamaha 2.1 pc speaker set). thanks for the suggestion i will turn them off and see what happens.

cheers,
-Mani

Title: Re:top of arcade monitor distortion
Post by: Dave_K. on June 18, 2003, 01:06:14 am

I doubt its the speakers...that would give you noticeable color problems (pin cushioning effect).  It may be time to re-cap the monitor.

Title: Re:top of arcade monitor distortion
Post by: Ken Layton on October 29, 2003, 11:22:21 am

Yep you could probably need a cap kit. Also try adjusting the little white "50/60 hz" trimpot on the monitor board.

Title: Re:top of arcade monitor distortion
Post by: JoeB on October 29, 2003, 12:28:41 pm

It is definetly the 50/60Hz knob..  it controls the squeezing on this monitor between the top and the bottom..

I posted a message about it earlier in this forum..  I had the exact opposite.. the lines were tearing apart at the top..