Common failure point is Motorola MHW3628 triple CRT driver IC on the HV8SA neck board (big IC in blue package). To verify, swap colors at connections with video board. The IC is very expensive ($75) from parts vendors. The one purchased by “customer” turned out to be defective, but no returns were possible. With the “new” IC, the monitor would not power up if the neck board was connected. I ended up sourcing another used neck board for around $25 (make sure it is the same part number) and this worked in the end.
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