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You need to replace belt with a new one. You probably will have better results if you take to have repaired, rather than DIY. You will need to call shops in your area for prices.
there might be a problem with your logic boardl, it seems to me that your motherboard hould be repaired or replaced. i've seen that you can reflow (resolder) the wifi chip which sometimes gets knocked loose. you can venture out and do it yourself.
if you look for repair guides online for a motherboard replacement you will find something. I work for company that does iPHone repair in NYC and we do this repair frequently.
The hum is a tube that has gone weak or a volume switch that may be going out! Try a TV repair shop in your area, and call first so they can tell you if they are familiar with the old equipment!
go to this site and post an email they have sources to obtain hard to find parts. They are in NC so if you click on the contact link list what your needing. I have used them countless times to get parts that no one else can find. http://servicemanuals.vstore.ca/
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