After change the LCD on new (new revision)
was problem with absence of back light, anather contrast
voltage and configuration the J9 jamper.
Because must to do:
1. Do not use bachlight.
2. Contrast voltage regulation theare is limits from 0 to 5Vdc
(original was -15 to +5V)
and must be set of potentiometer "Display Adj" on CPU board on 0V
for maximum (counterclock-wise).
3. J9 must be short to right position and interupt of left position.