The NEW Build Your Own Arcade Controls

Main => Monitor/Video Forum => Topic started by: jtslade on March 23, 2009, 08:52:37 am

Title: *FIXED*Super Bright interference and rolling white lines on 25" MVS Neo
Post by: jtslade on March 23, 2009, 08:52:37 am

So I fired up the TV after mounting the TV circuit board on the inside right of the CAB. It is held in place with wood brackets that I made.

(Reference my work log at: http://www.neo-geo.com/forums/showthread.php?t=187299 (http://www.neo-geo.com/forums/showthread.php?t=187299)   scroll to page two for details!)

The TV worked fine back when I had set all the settings before decasing it.

Now it is Super White Brightness (default settings) and has some rolling horizontal white lines (see picture and video link)

http://www.youtube.com/watch?v=c-3-9uKFcHo (http://www.youtube.com/watch?v=c-3-9uKFcHo)

The screen is very bright white and washed out
(http://farm4.static.flickr.com/3614/3379162030_2044a893a6_b.jpg)

Check out the pics and let me know if the board is to close to the Tube. Maybe its the Flyback Transformer causing it. But I am not a TV expert! I really could use anyone's help! Thank you..

(http://farm4.static.flickr.com/3659/3379154582_09a7159d9c_b.jpg)

(http://farm4.static.flickr.com/3474/3378329221_85550dd741_b.jpg)

(http://farm4.static.flickr.com/3567/3378324763_80c8097c08_b.jpg)

(http://farm4.static.flickr.com/3565/3379145888_ec71943eaa_b.jpg)

Title: Re: Super Bright interference and rolling white lines on 25" Hitachi switch MVS Neo
Post by: Mauzy on March 23, 2009, 09:43:36 am

Does the flyback itself have a brightness pot?

It almost looks like you may have accidentaly nudged the brightness pot out of place when putting the TV in the cab. This would give you the washed out look and horizonal lines (Ibelieve its referred to as horizantal retrace or something like that). Looking at you flyback, I'm not seeing any pots, but I would be surprised if there wasn't one hiding on the side not faceing the camera.

Title: Re: Super Bright interference and rolling white lines on 25" Hitachi switch MVS Neo
Post by: Honzo on March 23, 2009, 10:19:20 am

thats how mine looked when the screen volts was cranked up too high.  Try turning it town a WEE bit.  Not sure if the tv will have it on the flyback transformer but look for a knob labeled "SCREEN"

Title: Re: Super Bright interference and rolling white lines on 25" Hitachi switch MVS Neo
Post by: jtslade on March 24, 2009, 05:24:21 am

THANK YOU GUYS BIG TIME (thought I had killed this TV in proccess)

SO that fixed it perfectly. You guys were right I must of bumped the dial when decassing it.
A quick turn of the SCREEN Control Knob on the Flyback and it looks great now.

I was lucky enough that the dial is just barely accesable from the front with a long phillips head screwdriver.
(http://farm4.static.flickr.com/3585/3381972410_99aebe6015_b.jpg)

Closeup
(http://farm4.static.flickr.com/3465/3381980522_1ef67f4686_b.jpg)

Pics of the TV monitor in action: (TMNT USA 4 Player In Mame on ATI Radeon Mobility Laptop - SVideo connection)

(http://farm4.static.flickr.com/3461/3381155185_41c60a99d1_b.jpg)
A little bit of interference can be seen in the test pattern, maybe some kind of RF sheild for the right side of the Tube is Needed???


(http://farm4.static.flickr.com/3443/3381979444_3143ab6682_b.jpg)

(http://farm4.static.flickr.com/3473/3381156593_6c4e80d85a_b.jpg)

Title: Re: *FIXED*Super Bright interference and rolling white lines on 25" MVS Neo
Post by: Honzo on March 24, 2009, 01:11:38 pm

:)
glad i could help ya out! even though i'm a noob :laugh2:

Title: Re: *FIXED*Super Bright interference and rolling white lines on 25" MVS Neo
Post by: Mauzy on March 24, 2009, 07:50:38 pm

Sometimes the easiest fix has the greatest effect. Congrats!