Here are some of LE55ONS's most useful 'Phone Repair' videos so far:
- Nokia Lumia 800 battery and screen change
- Nokia X7 battery and case change
- Nokia E7 battery change
- Nokia C6-01 screen change
Now, a good proportion of the phones covered may well be in warranty still, in which case don't even attempt to copy any of these procedures. And, even, when out of warranty, only contemplate the merest possibility of trying these out if you're completely confident with fiddly intra-phone electronics.
But, for your enjoyment and sheer jaw dropping amazement, here are the Lumia 800 and E7 being, respectively, gutted to appropriate degrees. I guarantee your heart will be in your mouth as you think "Stop - how the heck do we remember which bit goes where again!"...