the sound didn't work with another potentiometer either, so i decided to look in a different direction. by pure coincidence, a frogger pcb popped up on ebay germany last week. it was listed as having graphic errors and sound problems. i wrote the seller an email asking about the sound problems and he told me that "sound problems" mean "no sound at all". i could draw two conclusions from this statement:
(a) the sound amp on the pcb is fried
(b) the seller didn't connect the pcb to a potentiometer and without that - as we know by now - there is no sound at all!
i didn't care about the graphic errors, because if the sound board worked i would simply exchange the sound pcbs and be done with it. so i took the gamble, entered my bid and got the pcb pretty cheap
bought the pcb on sunday, paid for it immediately and today - when i got home from school - a box was already waiting for me at my doorstep
inside, the anxiously awaited (supposedly) half-working frogger pcb
the first thing i did was swap the pcbs' sound boards. just out of curiosity, i connected the new frogger pcb (with my old sound board) first and guess what: perfect picture - but no sound. not bad for a start, probably just a voltage problem when the seller tested it. ok, now to the real deal: my old frogger pcb with the new sound board ready for the test!
click on the following picture to see (or better:
to hear) what happened
we've got sound, baby!!! 
this means i have a fully working frogger pcb now plus a half-working spare frogger pcb with no sound. i guess i should order a replacement sound amp and see if this fixes the sound problem. would be cool to have a fully working spare pcb! now if only that other package from the usa would arrive ...
