Question about Sony Ericsson K750i Cellular Phone

1 Answer

K750ikeypad keypad and scoral keys not working

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that hasĀ over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 7 Answers

This is a problem with the SE K750i. They key circuitry wears out. This is an older phone and if it has been used alot this will happen. A new kepapd and circuit will cost about €50 to €60 this is a large investment for a model of this age so its up to you if you want to undertake it.

Posted on Nov 02, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

1 key not working on iphone 4s keypad


My Dear your phone keypad ic default so please change keypad ic
and keypad problem will solved

Nov 01, 2012 | Apple iPhone 4S

Tip

How to repair keypad problem in China Mobile


First we need to know china phone keypad connected with PCB how way
(A) Direct on PCB
(B) Flex System (flex cable direct soldering pcb to keypad panel)
© Flex and socket system include (flex one side soldering with key panel other side connect to pcb with socket)
(D) only Socket System (here have 2 socket, 1 with key panel others with pcb)
Keypad problem have various type
1. All key not work.
2. some key work and some other not work.
3. sometimes work and sometimes not work.
1. All key not work
china phone all key not work for this type of problem
(A) though its touch screen phone, first try to disconnect touch panel line from phone pcb or display flex (4 line)
(B) though not solve and keypad direct on pcb first you try to good clean full pcb with cleaner.
© though not solve now you try to format/flash your phone because some time key problem come from software problem.
(D) though still not solve now you check must be CPU. 95% china phone keypad directly going in cpu. and other 5% first going to resistor or capacitor near the cpu or keypad than going to cpu. so now first check them than you can try to re-hot, re-soldering or changing cpu.
(E) though its flex or socket system, first check GND connection continuslay pcb to key panel. next check full flex or socket all line going continuously pcb to key panel or not. also sometimes flex or socket shorted with other line or gnd so check also them.
(F) Also you can check all key anyone is short 2 line.
(G) sometimes keypad line broken from cpu pin on pcb to key panel, so check them.
2. Some key work and some other not work
Some key work and some other is not work for this type of problem
(A) maximum time this problem we face for flex or socket system keypad. so check flex cable and socket all line any line is broken or not and though need change them. and check all key connection on key panel.
(B) though its direact on pcb, some of key line broken internaly. and maximum china phone have alternative test point near every key or with other key on keypad. so check them with multimeter and though need connect to not work key with near testpoint or other working key.
© common problem is keypad metal ball (which is short 2 line on key when we press) sometimes its damage for phone water damage or over key voltage, so clean them or change.
(D) also try to check line continuously from cpu to not working key.

3. sometimes work and sometimes not work
this problem come from this defect
(A) flex or socket system keypad any line is bad soldering or do lose contact. check them and
re-soldering or keep there line join with extra ware.
(B) for cpu bad soldering or cpu pin is broken. so re-hot or re-ball cpu.

on Jan 06, 2010 | Cell Phones

2 Answers

My nokia 5130c kepad is not properly working that the key is 6,9,# is not properly working


Thanks for writing Fixya. I am Marion and let me help you with this.
There are reasons why your phones keypad is not working, first, have you tried re aligning your keypad if it fits exactly on the button, also, you may try pressing the keys without the keypad tofind out if the problem is just on the keypad or on the phones hardware already. Also, the keypads functionality may affect if it had a water spill or had dropped previuosly.

Jun 24, 2011 | Nokia 5130 Cellular Phone

2 Answers

Keypad is not working


hey
first tight your phone's screw may be this works try this ok

May 04, 2010 | Nokia 1661 Cell Phone

3 Answers

Key 1,2,3 not working


nokia3250 key 1,2,3 not working

Oct 02, 2009 | Nokia 3250 Cellular Phone

1 Answer

My Nokia 5200 (Number keypads) will Not Working


u need to change the key pad until then it wont work.


two keypad IC's under the keypad and next to the keypad connector unfortunately all the keypad points are linked to the IC's and so even if one key doesn't work it is related to these IC"s in question UNLESS the keypad connector is dirty or sticky please do service your phone or take it to a reliable technician

Jul 01, 2009 | Nokia 5200 Cellular Phone

2 Answers

SELECT KEY NOT WORKING IN NOKIA 6600


i can solve that but first ad me at my ym ken_craze

Mar 14, 2009 | Nokia 6600

1 Answer

Keypad doesn't work


good morning ! the problem of your 6233 nokia is keypad main brain or keypad crystal ic ,,,,try to clean the keypad mainbrain or replace the keypad ic ! thanks ! good luck ! ......

Sep 07, 2008 | Nokia 6233 Cellular Phone

6 Answers

Keypad not working


hi! this is jc villarosa, i have problem with my keypad..i can't find key foil for my keypad..do u have idea where do i find key foil to buy?

Aug 23, 2008 | Cell Phones

Not finding what you are looking for?
Sony Ericsson K750i Cellular Phone Logo

Related Topics:

35 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sony Ericsson Cell Phones Experts

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Les Dickinson
Les Dickinson

Level 3 Expert

18298 Answers

phil

Level 2 Expert

567 Answers

Are you a Sony Ericsson Cell Phone Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...