Qantum Fieaball

Hi my name is Hapenciuc (hopfen@k.ro)
I have a big problem:
-the TDA5247 chip of my qantum fireball HDD is “fused”, and I would like do replace it (i can do this) but I cant find it (the TDA5247 thing)
My qestion is simple :
What other chip is pin-to-pin commpatible with TDA5247, (on oher qantum fireball HDD is saw a “simmilar” chip: NEC787 is this good???)

Please help!!!!!!!!!!!