kpcvlp:
I have tried to solder it but have given up.
Did you resolder the broken wire itself, or did you use a new connector/jacket?
Mind the polarity from the ir-eye. You can't just resolder the wire without checking the polarity.
If you use a new connector, then the chassis is ground (-) and the little top is the positive lead (+). -> STB/DTV
If you re using a 3,5mm stereo jacket, then the middle ring is the positive lead for STB/VAUX.
So if your soldering doesnt work, try to resolder the wire and switch both leads. It will not damage your BV5 by switching the leads.
It works or it works not, its that simple.