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Unusual CRT monitor screen symptom no one has been able to recognize (yet)
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chaos199
I have a kortek KTX-26 chassis and Zenith CRT from a LAI NEO-GEO cabinet (and it was used in a lot of LAI early 90’s cabinets). A have 2 NEO GEO 6 slot cabinets (both left unused in storage for 15 years) so to isolate the cause I swapped the MV6 board, game power supply, chassis, game carts and even ran the power cable to the chassis from the other cabinet but trying all these thing never made a different so I believe it must be the CRT or interference from something. My other identical NEO cabinet works fine and the filament in the CRT neck is just as bright. One technician said it likely be a high voltage problem without seeing it. There is no arching at all. I went through a huge monitor repair guide consisting of over 115000 words (http://repairfaq.cis.upenn.edu/sam/monfaq.htm) but unfortunately nothing was mentioned that fit my symptom (but I did learn plenty of other things from it).
The effect on the screen is flickering rectangle dots that consistently flash all over the screen. I haven’t noticed a pattern, it just seem to flicker/flash like rain drops. The dots are white and they become more or less noticeable depending on how bright the screen is with video graphic changes. It is most noticeable when the screen changes between bright and dark - like when the NEO GEO logo pops up on the screen. Changing the G2 control on chassis does not fix the issue and will only alter how noticeable it is when the screen is dark or not (which is useless with video game graphics constantly changing. I have read power source can give interference even if from down the street but unsure why my other cabinet is not effected.
It would be really great if someone could give me advice on how to fix this monitor issue or at least has heard or read of it happening to someone else (hopefully on this site), and the name of the symptom (if it has ever been given one) as it may give me a new direction to search for. I will attach a link to some tiny mp4’s to notice the flashing tiny horizontal lines (never mind the vertical lines in the logo vid as I have since fixed that glitch). I am very surprised that with so many users on the site with arcades I can’t find any post mentioning the same type of issue.
https://drive.google.com/file/d/11E7JFgL2vhl2mmk-dqZDwBKXXuMVUdhZ/view?usp=sharing
https://drive.google.com/file/d/1F15Dy-EeI5YdxeTGHwKI79urjyvgmcws/view?usp=sharing
https://drive.google.com/file/d/10OxvfDrQvX7yVynHZqDOEM8BZX5S-lZW/view?usp=sharing
neo.mp4 - Google Drive
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