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Question about Sony Ericsson K750i Cellular Phone

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Sony Ericsson K750i keyboard(?) malfunction

The keys 1,2,3 and the toggle switch do not respond. Rest of keys ok. I stripped down the switch, which was dirty inside,cleaned it and retested it without success.

Posted by Peter Cormack on

  • Anonymous Jan 07, 2008

    keys 12 and 3 not working

  • Anonymous Mar 19, 2014

    My screen went black and keys 5 and 8 were dead.So I replaced screen,keypad and flex on my cellphone and screen works fine now but the keypad is somewhat working.By somehwhat i mean : asterisk button does not register at all but when i press the button upper from the end-call button,asterisk pops up,and some keys register as other keys (ex.up button as 7,right as calendar shortcut,) The main button (The OK button)works fine inside some menus but when not camera opens instead.Maybe its just a low-quality keypad?Or its not properly attached?

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2 Answers

Peter RCormack

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I assume the case is undamaged & therefore wasn't dropped.I suggest this is a firmware problem as the phone hasn't been inspected internally before. Maybe related to SIM card? Try copying SIM card to another & replace it.

Posted on Jul 06, 2007

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Anonymous

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Your fon might be dropped and that's the reason maybe the keypad IC get malfunctioned

Posted on Jul 05, 2007

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My sony erricson k750i phone's joystick is not responding

you have to clean the joystick by using contact cleaner. open the cover of joy stick, there is a switch inside it having a metallic cover. use contact cleaner and let it for few minutes.
DONT FORGET TO REMOVE LCD FIRST. it can be damage with contact cleaner. i had a bad experience of it.
btw it happens with sony ericsson phone joystick problem.if joystick problem still persist u have to show it to sony ericsson repair centre or your warranty center of mobile.and u can also use the keys your keypad keys for up down left right.
thankyou.
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uninstall all your programme and try
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cheak the continuty on trakes between 1-2 teminal of joystick

and key pad ic if ok reball keypad ic not ok  then you have to replace ic.

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