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pin 5 is the ref voltage from the voltage divider off the boost.
Clearly the boost is low as it should be in the 800v range (the voltage divider of the 1.5 meg resistors and the HV adj pot sets up the 400v that should be there.
the low voltage on the pin 5 means the shunt is completely cut off, so its doing nothing (the HV adj is prob not having any effect).
I would look at the .068 caps off the eff coil, leakage there could pull down the boost voltage.
check the resistance reading of the yoke as well for the horz windings.
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