Test lamps will help a lot.
Recaping will be the best for the unit this old, or at least replacing the two small lytics caps on the inverter board, those two are the common cause of the lamps flicker.
before,
i just want to be more precise, there is lot of horizontal white lines flickering on the screen, ,,, plz see the video , https://vimeo.com/170660934
I would try heating the main/logic board with hair dryer to see if it has any effect, and cooling it with canned air duster using it upside down to get the coolant to cool the board to see if it has any effect.
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