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There is a little rectangle shape thing next to the lg logo on the top of the fone screen. If this is blocked by screen protector it will cause the phone to blank of during calls. Its a power saver that blanks the phone when its near your face. Try it. Take off the screen protector & make a call. Then place your finger over the little thing & the screen goes blank. Just cut a lil space in the screen protector & that will fix the problem
If you have a screen protector on, the proximity sensor is covered by the screen protector. The sensor is locate on top left of the screen next to the inner camera. Cut of the piece of screen protector and it should solve the problem.
sir is it blinks with white screen only or blinks with white screen then shut down? -if the phone can receive/send text and mms messages while the incoming and outgoing calls become shut down,i think you need to replace the battery because it is weak.use only original battery. -and if it is blink with white screen only try to reset all settings or reformat your phone,if not work hardware problem go to repair shop.
I had the same problem with my iPhone the only way I was able to fix it was to re-flashed the latest 2.2 firmware. Power phone off, power on by holding power and home at same time, hold power for ten seconds and then release still holding home key for another 30 seconds to put phone in DFU mode. Then plug into iTunes it will detect phone in recovery mode and allow you to re-image
The keyboard cable is worn or broken, take it to a service center for replacement. The keyboard cable has a small magnetic switch that detects when the phone cover is open or closed. If the keyboard isn't working and the internal screen is blank, the phone detects that the cover was closed.