There are 2x rows of small radial caps at the back of the LCD panel that need to be replaced. It's a fiddling job as there's very little room.
If you have recapped the LCD and logic board but it still doesn't work, have a look at the PCB with the brightness/contrast pots.
I can't recall if there are capacitors on the interconnect board as well: I do know that I replaced every capacitor except for tantalums/ceramic one's in my 3x PB100 and they all revived.