e74 error code has nothing to do with the chip, or the av cable.
the only solution is to get the gpu and surrounding area resoldered.
the towl trick might work, but thats luck.. basically it MIGHT reball the gpu if it gets hot enough. doubftull though.
the pennys only make the board flex and make enough contact with the case to keep the solder intact, momentarily.
cleaning off the compound and replying new compound might work, it didnt for me though. but it couldnt hurt.
i had e74 too.
i just got my box back today, i had my friend fix it.
M$ said that my warrenty had expired, which is a lie.
they wouldnt fix it, so i did it myself.
its funny cuz the supervisor said that no one in the entire UNIVERSE knows how to fix them besides them..
i was like, wow, you are a *** idiot.
http://forums.xbox.com/19655347/ShowPost.aspx
look at my post at the bottom..
My Music,My Li[f]e.