Build Your Own Arcade Controls Forum

Main => Monitor/Video Forum => Topic started by: superboss on July 07, 2011, 03:57:53 pm

Title: Distortion (videoclip included)
Post by: superboss on July 07, 2011, 03:57:53 pm

Anyone know what is causing the phenomenon in the video below?
Video 2011 07 07 20 49 03 (http://www.youtube.com/watch?v=N2vxsDXhYh8#ws)

The monitor is a NANAO MS8-26SU.

Title: Re: Distortion (videoclip included)
Post by: qrz on July 09, 2011, 09:06:30 am

changes in beam current (crt) is affecting the regulated B+.
this will be more noticable with the dark (low beam current ) background shown.
all crt sets will exhibit this to some extent.
excessive distortion can be due to poor regulation . or in the case of blooming, a weak crt ...

Title: Re: Distortion (videoclip included)
Post by: lilshawn on July 09, 2011, 01:42:46 pm

a weak main filter cap can cause all sorts of weirdness like that.

it's the biggest 220 or 330uf 2/3 or 400 volt cap on the board.

Title: Re: Distortion (videoclip included)
Post by: boardjunkie on July 09, 2011, 04:25:59 pm

That looks excessive to me. I bet theres a cap in the pwr supply thats not doing its job.....