i have a mz-g750, sand got into my player, into my discs, and i ordered a replacement jack. wasn't careful when doing the soldering job, i think i fried the new part as well as the surrounding parts. This was about 4 years ago. I think i may give it another shot next week. it was extremely crowded, if i recall. very difficult to replace the part if you dont have the proper tools. I can't believe i tried to use a little desoldering vacuum pump to suck up the solder. anyone know the part # of the headphone jack?