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Help identifying this monitor - Kortek
Ken Layton:
In regards to the arcing of the flyback, you should carve up the flyback cage as described in my repair guide to allow more breathing room for the flyback. Then clean off the area of the flyback where the arcing was coming from with household spray cleaner (I like to use Mean Green), then swab the area with 99% isopropyl alcohol. Now glob on some clear silicone glue over that area and let dry. This should eliminate the arcing and allow you to run the monitor normally.
infrared:
I do exactly what you said and the problem fixed. No sparking any more.
The only thing i have now is with the horizontal width coil. Then screen width is expanded over the screen and with the coil i can do a little things.
I changed the coil from another same board and i also changed the cap C414 (434/200=.43uF/200V). No luck. I tried bigger cap 0.47.uF and after 0.56uF.
The problem insists.
infrared:
Finally fixed.
The problem is that the JC jumper (Red small wire with black connector) has two modes. N=Normal, W=Wide.
The jumper was in wide mode and for that the horizontal coil cannot reduce the screen so long.
When i put it in normal mode the screen reduced and made possible to adjust with the horizontal coil.
Now the monitor is perfect with correct colors, width and height
See image 1 in yellow circle
and finally the second image with monitor running a game (the image is not best because i am not good to take photos)
I have repaired a lot of pinball machines (www.firepower.gr) but it was my first attempt to repair a cabin with monitor problem.
I want to thanks again Ken Layton for his help.
Regards
Michael
infrared:
Hello again Merry Christmas and a happy new Year.
Suddenly today the monitor starts to display like this (see photo).
I think this is a vertical collapse but i don't know where to look in the schematic.
Is it possible to give me a tip where to look and what components is more common to fail ?
Regards
Michael
Ken Layton:
First place I'd look is to see if you've broken either the Vertical Height pot or the Vertical Hold pot. They are very delicate and can break easily.
Next look at the two vertical output transistors Q201 and Q202. They are both bolted to the flyback cage. Both are also type 2SD1138 (this type is also used on Electrohome G07 monitors).
Next check the integrated circuit IC401.