Quasar WP3422QW only stays on for a couple seconds

[zeno]

Sounds like HVSD ( high voltage shut down) . If you have a variac
try running the set at @95 VAC. IIRC this chassis had a repair kit
for the power supply. Too long ago to remember the details. A recap
not in order, fix the HVSD first then there are a few caps to change.
A wholesale recap usually ends in sorrow
Anyhows they were good sets & odds are it will come out fine.

73 Zeno
LFOD !