1976 Trinitron flickering blue color

[zeno]

Just thinkin.... Those transistors may be on the main PCB. Look for 3 identical
transistors with metal tabs & small parts. They are the place to look first
for missing or excess of one color. One each for R out, G out & B out.
Still check the CRT socket for cold PC cons. You can usually smoke out
cold joints with light tapping

C U later
Zeno