can use it normally after i put switch on
but... if i change refresh rate while i play game from 1024 768
or another to 800 600 or other refresh rate
monitor has black screen... not have picture
green light is light
i can see picture again after i put switch off and on again
have b+ 83 volt when it black screen
what ploblem
i wait for your comment................ thank

Most likely this is due to the EHT overvolting during the refresh change, this may be due to the internal cap in the FBT going low in value.

Put up with it the cost of replacement is more than the monitor is worth.

Rich

thank...rich
i will replace fbt tomorrow
in my country all of spair part very cheap
fbt cost at 3 $ us
thank again