Build Your Own Arcade Controls Forum

Main => Monitor/Video Forum => Topic started by: lettuce on May 14, 2012, 01:27:12 pm

Title: Colour Fault on New Monitor.
Post by: lettuce on May 14, 2012, 01:27:12 pm

I have a new Pentranic CGA 15khz CH-288-S26A monitor, and have noticed that a section of the screen has a strange fault when showing the colour red, it appears to turn a washed out red/pink colour. I have attached some pics and posted links for vids to best show this fault.....

http://youtu.be/sySna-GkX8M (http://youtu.be/sySna-GkX8M)

http://youtu.be/iexD0wIAB30 (http://youtu.be/iexD0wIAB30)


Any ideas what is causing it??

Title: Re: Colour Fault on New Monitor.
Post by: ed12 on May 14, 2012, 02:52:09 pm

hi
thats called :purity:
if u have a deguass coil go around the face of the tube :1: way olny and start at the tube and walk backward's about 4 feet turn off deguass coil
should shovle your problem
if not then the monitior was dropped and the shadow mask has slipped

ed

Title: Re: Colour Fault on New Monitor.
Post by: lettuce on May 14, 2012, 04:02:04 pm

Nah i dont have a Deguass coil, is there another way to sort it.

If the shadown mask has slipped cant this be fixed?

Title: Re: Colour Fault on New Monitor.
Post by: ed12 on May 14, 2012, 04:26:49 pm

hi
do u have a weller 450 watt soldering gun?
if so it will do fine
and no to the shadow mask slip

ed

Title: Re: Colour Fault on New Monitor.
Post by: lettuce on May 15, 2012, 10:03:07 am

Quote from: ed12 on May 14, 2012, 04:26:49 pm

hi
do u have a weller 450 watt soldering gun?
if so it will do fine
and no to the shadow mask slip

ed

No I'm afraid I don't have a solder gun :(

Title: Re: Colour Fault on New Monitor.
Post by: lilshawn on May 19, 2012, 03:38:14 pm

you basically need a magnetic field to re randomize the screen. it has developed a magnetic field that's pulling the electron beam off course slightly. It's not much...try turning the cabinet 90 degrees and see if it changes. maybe you have some speakers nearby (upstairs downstairs/neighbors house) even steel studs, metal file cabinets and florescent lights have been known to mess with it. arcade monitors are pretty susceptible to magnetic fields screwing with the colors.

that being said, a big speaker magnet waved around can set it straight. but it's very time consuming and you could make the problem worse. but a degauss coil is going to be your best bet. see if there are any repair shops in your area that could loan one to you. call a few amusement company that have video game machines. perhaps they would have one you could use.