I don't know the AV booster but think that you'll need an NTSC->PAL convertor. The PCE send out an NTSC-J signal, and as long as your TV can't display NTSC you won't get the correct picture (black/white screen).
I own an older Philips TV myself, which displays 60Hz without a problem, but cannot display the NTSC signal provided by my PC-FX without a convertor.
Hope this helps