Question about LG VX-8700 Cellular Phone

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Im having problems with the speaker in my phone, It seems i have a bad contact between the lower part and the upper part of my phone for the speaker signal, I don't hear a sound. If I close the flap just a little bit to change the angle, i get the sound. If i put it on speakerphone, it helps, but sometimes, i dont hear anything there also. Is there anything I can do at home to correct the problem? I am an electronics technician, so i have probably everything i need to fix this, I just need some pointers. Thanks Francois G.

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