Human skin has resistance, it isn't a resistor. A resistor is a device designed to control electrical currents. Human skin isn't designed to do this. Literally everything has resistance.

human skin is a resistor.

Make sure you set the correct bits on the registers NR50, NR51 & NR52.

For example:

ld      a,$80         ;Turn on all sounds
ldh     [rNR52],a

ld      a,$FF         ;All sounds to left and right
ldh     [rNR51],a

ld      a,$FF         ;Both left and right max volume
ldh     [rNR50],a

Edit:
Oh wait..... I've been programming too long.

Oh that explains it. I was thinking that using too much solder creates a resistor.

if you connect a bunch of stuff with a molten blob or you have a cold solder joint it can cause a short. i have been using a cheap iron that came with a computer repair tools kit

Can too much solder actually do that? I mean if its not contacting anything else

Any recomendations for a good soldering station? I had to give mine up.

I got it sorted out. it works again!

Youtube soldering.

Workstation? Sounds like you may be using improper soldering techniques.

update... i desoldered the jack. i have sound. maybe i need to use less solder! wish i had a better station to work with.

I only have a blurry cellphone cam.

One of mine stopped working also. Maybe retry the solder joints and replace the new jack?

Post photos of what you did and we'll tell you what you did wrong.

I did low gain's tutorial. the prepot solder job was  working ok, but now theres no sound from the prosound jack or the original headphone jack. also frontlit it. what could have went amiss? I wasnt trying to do a no sound mod...