Have you open up you PSP?

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Good day to everyone! I have done this a couple of times already. Be it on recalibrating the analog stick or cleaning those boards associated with the directional or other buttons. At first, I was hesitant since I really didn't know what to do but, after reading a few forums about PSP and how they manoeuvered themselves through from getting it open and putting things together again. Though, I merely just took the face plate off and not really took it apart since, I really had no reason to and would like want to have any (^_^") How about you guys? Have you open up your PSP? For what reason have you open or not open up your PSP?