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Main => Monitor/Video Forum => Topic started by: xtommyboy22x on November 25, 2009, 02:53:31 pm

Title: Punch-Out!! Monitor Problem
Post by: xtommyboy22x on November 25, 2009, 02:53:31 pm

Hey maybe someone can help me out. I recently refurbished a Punch-Out!! Arcade machine. I replaced all capacitors and the picture looked clear and crisp. Only on the lower monitor there is a little scrambling of the picture in the corners and then it goes away. It almost looks like when you need to run tracking on a VHS tape to get the dirt off. Does anyone know of a solution to fix this? Here are two photos I took. It was hard to catch it because it happens so fast.

You can see the scrambling starting to happen right on the lower turnbuckle here.

(http://i635.photobucket.com/albums/uu80/xtommyboy22x/IMG_1479.jpg)

You can see the scrambling in the right corner here.

(http://i635.photobucket.com/albums/uu80/xtommyboy22x/IMG_1482.jpg)

Title: Re: Punch-Out!! Monitor Problem
Post by: gokun on November 30, 2009, 10:15:39 am

hard to tell from the photos but that looks more like a problem with the game pcb to me...like a graphical glitch...could check the game roms(specifically the one or ones that store the graphics) and if bad re-write them if you have a programmer...i'm not exactly an expert though so feel free to get a second opinion ;)

Title: Re: Punch-Out!! Monitor Problem
Post by: Deadly on December 07, 2009, 11:54:20 am

Since PO utilizes 2 monitors try using the other one to verify the problem indeed exists on the game PCB.

Title: Re: Punch-Out!! Monitor Problem
Post by: Kevin Mullins on December 07, 2009, 12:57:44 pm

My initial guess would be a pcb glitch as well.

Like mentioned above.... just switch the video inputs from the top monitor to the bottom monitor and see if it's still there.

A monitor problem would cause the graphics to be messed up plum top to bottom, left to right, etc across the entire screen. Not just a select few specific graphics or spots.

Title: Re: Punch-Out!! Monitor Problem
Post by: SirPeale on December 07, 2009, 01:34:50 pm

It looks pretty minor - definitely not a monitor fault - are you sure it's a screwup and not a "bug" in the game code?

Title: Re: Punch-Out!! Monitor Problem
Post by: xtommyboy22x on December 29, 2009, 02:32:59 pm

I switched monitors and the glitch was on the top not the bottom monitor. The weird thing is that it just started to happen a little while ago. I sprayed connector with cleaner and the board with cleaner and it still is doing the graphical glitch.

Title: Re: Punch-Out!! Monitor Problem
Post by: Kevin Mullins on December 29, 2009, 02:53:30 pm

Quote from: xtommyboy22x on December 29, 2009, 02:32:59 pm

I switched monitors and the glitch was on the top not the bottom monitor.

Then it's coming from the game pcb.