Although rear cover can be opened, but it’s so difficult to open actually. When it’s open, battery is easy to take out.

Screws on Lumia 820 are more than Lumia 920

Disassembly and assembly of Lumia 820 is just same with ordinary phone.

Inside structure is simple. Chips on green PCB board are sealed up by shielding case. Lines you see actually strengthen the cover

Only two flat cable inside Lumia 8

Generally speaking, inside structure of Lumia 820 is relatively simple. But we just know quality of Lumia phone from Nokia. 

via XDA.cn