Sorry for the delay in replying and thanks for the direction. The monitor is:
Goldstar
Type: 310KGB4A
Again - as stated by my friend, it was working fine one as it had for quite a few years, then after sitting a few weeks, they powered on the unit and everything works except the monitor. There is no sigh of life in it at all. Appears dead. They never had the unit open or messed around inside of it.
I'm more familiar with vintage stereo tube gear - not so much these types of machines. But is there a way to test the picture tube to know whether it is function - impedance to measure - something like that?
Do I need to go back and look for a model number on the monitor?
thanks
Mike