I think I am posting about the right set.
Been thinking about your restoration in the...
Predicta "Holiday" restoration p13o?
http://www.youtube.com/watch?v=UlHtGky46r4
at about 16:05 the LED Back light was staying lit for quite a while.
I believe if you connect the high side (ungrounded) lead of the LED to the high side of the filament string it would stop the strange behavior.
My theory is that since LED lighting will stay lit with only 3.2v across them at
a very low current, the capacitor is holding enough charge to cause the LED to stay lit until the charge is depleted.
If you relocate the lead to the (top) of the filament string the resistance of the tubes will drain the charge at that point almost immediately, so the LED will extinguish almost immediately.
The voltage at this point is AC and there is no DC path back to the filter capacitors.
Have a good day...
Love your restoration videos...
rrrhre2s