@ Leslie, I did a recap and battery replacement and that resolved the issue for me. Can be viewed in this thread here
http://forum.beoworld.org/forums/p/35867/297765.aspx#297765
I would do basic check:
Battery is good and producing 6 volts?
Pin 10 on the ribbon cable is at 5Volts when BL is on and 0 volts when off. If it is, then issue is with the analogue board. If it’s not, then issue is the digital board.
Check with a meter that there is continuity in the ribbon cable ie. No break.
Reseat the ribbon cable.
Next:
If you have two BL’s try compare voltage readings on same parts of the board between the two.