measure the screen grid voltage at G, which typically runs from 250 to 750 V in normal operation. If the voltage is low (even with the
screen grid control at maximum, power down the monitor, remove the video drive board from the monitor’s neck, restart the monitor, and measure the screen voltage again. If the screen
voltage returns to normal, you can be confident that the screen grid is shorted. If screen voltage remains low, you might have a fault in the screen voltage circuit. You can also verify a short between the control and screen grids by powering down the monitor and measuring resistance between the G and G pins on the CRT neck. Ideally, it should bean infinite resistance.
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