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N73 does not have power switch button unlike other usual nokia phones,it consist of flex connector(together with the antenna case) were two pins connected on the upper part of the main board hitting that flex connector, can easily fix by cleaning the circular interface as well as the membrace when power ON is triggering.
DIY method :
* detach the front cover of the phone * unscrew 6 screw obviously shown.(use T6 precision screw driver or any tool can possible do.) * remove the lcd frame * gently lift up the lcd screen (start from the top) then you will see it's flex connector,release it using even a precision flat screw.then remove it. * you can see another screw in the middle,release it also. * release the clips (use precision flat screw) both sides in the middle portion. * now take the entire module (metal shiled & PCB) start from the top then pull the memory card knob,be sure there is no mmc inserted,it may stuck nor damage the mmc. * On the back cover,you'll see a square type, which is seems to be the antenna and were the power or rubber switch is connected.release the clips from the top using the flat screw. * you can see a circular metalobject that taped (membrane)clean it using any rust solution,both interface,you can use scrub or scratch it gently. * Now assembly the phone and make a test if the power ON is working now.
Otherwise,need to test the 2 line were each contact works well or need to replace that flex connector if broken or damage.
* you may bring the phone to any mobile service shop near you for assistance.
Its seems keypad flex connection is the problem,this is due to some instances like water damage that may result into shortage keypad interface,accidentally dropped the phone to the ground that cause dislocating or need to re-align the flex connector terminal.
Here's a guide
* slide the phone up, on the edges of the whole keypad below, just pill the sticker type cover on keypad,when you see the button if it's dirty, lift up the so called keypad membrane (a circular metal) and clean both interface. Now try it if works.
Otherwise, need to replace keypad flex and it is available to any mobile service shop near you.
1. try to check if the volume up or down is working,if not, remove the battery cover and dismantle the lower panel at the back using a T6 precision screw,unscrew 2 screws and by using your thumbnail look for edge cover,insert and lift it up gentle (remember that a flex connector is attach on the right side If done,check the volume switch and remove the circular metal (keypad membrane) that is volume high and low apparently.clean it and align it when returning back before assembling it(might some shortage or hang buttons that's why keys are not working).,also try to check if the flex connector or socket is clean as well as the board socket connector cause keypad function has the line with it.assemble it and try if its working.
2. If the method above fails,need to replace the keypad flex cable.it maybe to risky for you to do cause the keypad connector is connected at the upper flip panel.i maybe reliable if you continue and there's a chance to break the lcd cause upper portion is to hard to dismantle.better bring it a mobile service center for keypad flex replacement.
there is no longer a mster unlock code on MOST phones. there is usually a small reset buttun underneath the battery. if all else fails take it to your service provider and they will reset the phone for you. and can back up your contacts as well. this is the only workable solution!
Check the proximity sensors on the front of the phone, if they are dirty or covered by a screen protector or case, they may be malfunctioning and preventing the screen from coming back on. They look like small circular sensors, probably above the phone screen.
If you have a touchscreen type phone, it has several small sensors to detect proximity, preventing your cheek from pressing buttons while you are talking. These sensors may be malfunctioning. They probably look like small circular areas, near a top corner of your screen. Wipe them clean and ensure that your case and screen protector are not interfering with them. If they are covered or dirty they may not detect when you move the phone away from your face.