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Main => Monitor/Video Forum => Topic started by: copados33 on November 28, 2013, 06:20:17 pm

Title: Screen brightness decreases depending of the game stage
Post by: copados33 on November 28, 2013, 06:20:17 pm

I have a monitor in one of the arcade machines that as the game screens change the brightness decreases, this only happens in some stages in different games, it doesn't matter what I use to play the game, be it the original PCB  or Mame, it happens for example in the Teenage Mutant Ninja Turtles in the intro scene before the turtles jump inside the building, the screen is fine but soon as the the game starts the screen turns darker.

Then when I enter the office where you fight the first boss the brightness returns to its original setting, the only solution I have until now is the brightness  potentiometer in the remote board all the time to make the image look as I want,

is there any way around this??, maybe moving the voltage potentiometer a bit on the monitor chassis? I ask for help from experts before trying anything that might damage the monitor.

Title: Re: Screen brightness decreases depending of the game stage
Post by: grantspain on November 28, 2013, 06:38:12 pm

and the make/model of the monitor is?

Title: Re: Screen brightness decreases depending of the game stage
Post by: copados33 on November 28, 2013, 09:12:15 pm

It's 27" semi flat tube coupled with a Wei-ya universal chassis.

Title: Re: Screen brightness decreases depending of the game stage
Post by: grantspain on November 29, 2013, 03:25:41 am

is there a ABL adjustment on your new wei ya chassis

Title: Re: Screen brightness decreases depending of the game stage
Post by: copados33 on November 29, 2013, 05:40:01 am

Excuse me but I don't know what ABL means, this one here:

(http://imageshack.us/a/img713/6291/wmhv.jpg)

(http://i880.photobucket.com/albums/ac8/chinitosoccer/yzzc_zps52c9976c.jpg) (http://s880.photobucket.com/user/chinitosoccer/media/yzzc_zps52c9976c.jpg.html)

(http://imageshack.us/a/img209/193/wdn2.jpg)

Title: Re: Screen brightness decreases depending of the game stage
Post by: grantspain on November 29, 2013, 07:47:45 am

i doubt that has a ABL adjustment on it,
That is a cheap chassis,it is probably slightly out of spec for your tube

look up ABL on google

Title: Re: Screen brightness decreases depending of the game stage
Post by: copados33 on November 29, 2013, 09:19:28 am

Australian Baseball League  :D

got it: "automatic brightness limiter"

Title: Re: Screen brightness decreases depending of the game stage
Post by: grantspain on November 29, 2013, 10:18:25 am

Quote from: copados33 on November 29, 2013, 09:19:28 am

Australian Baseball League  :D

got it: "automatic brightness limiter"

you got it,
some old tubes are ok on this sort of chassis but later tubes do not like them-i believe it is to do with the ABL circuit