Question about Sony Ericsson W850i Cellular Phone

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Touch Screen 'Back' button on my K850i affected by every other button.

When navigating my way through the phone be it the menu or txt messaging the 'Back' Button ( right hand side touch screen button) keeps selecting itself when i push other buttons.

eg: wrighting a txt and i will be typing a word and on selecting a button say 'abc' ro 'jkl' it seems to trigger the back button which navigates me away from my txt and prevents me from continuing.

Any ideas?

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  • Anonymous Jan 31, 2008

    My Sony E. K850i is actually completely useless - touchscreen rarely function properly so I can't even unlock the phone to access other functions. Camera not bad but functionally - by far the worst phone I've ever had.

  • admil Jan 31, 2008

    Just a note to say my k850i is doing exactly the same. Doesn't matter what mode i'm in. bloody annoying when navigating menu screen and seemingly a spirit presses my back button which takes me back to home screen. Anyhow, i've rang orange who sending me a lovely 'reconditioned' one out tomorrow night. this is my 5th Sony Erricsson phone and i've loved them all, except this one. If i'd known it had poxy touch screen buttons on it i wouldn't of had in first place. I've seen the problems friends have with their other brands/ phones.

  • Anonymous Feb 01, 2008

    oops i pressed the wrong button and put as solution wasnt sure how to post. ringing my provider this very second to get replacement as it only just started.

  • Anonymous Feb 09, 2008

    back button doesn t work right

    or sometimes i can t unlock the keys cause of that problem

    that SUCKS

  • skassim Mar 11, 2008

    I have the same problem with my K850i. I cant use the phone anymore because the back touch button keeps activating with the push of most other buttons.

  • Anonymous Mar 17, 2008

    did anyone find a solution to the problem or did you just have to get a new one?

  • Anonymous Apr 27, 2008

    My menu button dosent work and when typing a text it automatically presses menu which is anoying. i turned the phone off and now i cant get past the enter pin screen as i cant push "ok" Double annoying!

  • Anonymous May 27, 2008


  • Anonymous Jun 27, 2008

    im on myt second k850i thats touchscreen has broken can i still ask for a new 1?

  • Anonymous Jun 29, 2008

    phone keeps freezing and selecting its self

  • Anonymous Jul 26, 2008

    exact same problem, back button keeps selecting itself. very annoying, prevents me from using the phone as it backs out of every application each time I go in. Seems like any vibration on the keypad sets it off. Any suggestions??

  • Anonymous Dec 03, 2008

    i can not do any thing fo a bit becouse it turns it self off

  • Anonymous Dec 23, 2008

    the 3 touch buttons stopped working suddenly

  • lil_aj_5 Jan 03, 2009

    i have exactly the same problem ! its really annoying,, if any of you find out a way of fixing this, please e-mail me!



  • Tsunamai Jan 21, 2009

    Iv opened the phone, removed the lcd and they keypad and reposistioned both. no joy, still presses 'Menu' when i press practically any button. i used to love this phone, never had a problem before unlike everyone else. Whats the warranty on a T-Mobile K850i?

  • Anonymous Feb 11, 2009

    None of the touch screen buttons work on my Sony Ericsson K850i, so annoying, it was on and off with them for a while but know they've gone all together

  • mkb637 Mar 26, 2009

    Middle Button not working when pressed and then selects itself when almost any other button is pressed. Started randomly... Not happy. Has anyone been able to fix this fault?

  • Anonymous Mar 29, 2009

    My friend was messing with my phone (k850i) 2 days ago and all the buttons went all weird... now everytime i press down or left it goes to back, and you cant unlock it because the back touchscreen isnt working. you cant press any number buttons without it going to back. Also when im writing a text it random things pop up, like what the hell. iv had mine for a good while now, and about christmas time it kept shutting itself off and on, which wasnt to bad but now i cant do anything and im going to spain tomorrow with a phone that wont friging work.

  • Anonymous Apr 01, 2009

    Same god dann problem with the select button. Anyone sorted it yet?

  • Anonymous Apr 25, 2009

    same here on my wife phone(k850i) but with middle 'soft' touch button

  • jamond May 14, 2009

    yup! mine just started having this weird middle touch screen when i can't use it (although the right and left touchscreens are ok)-like it hangs. then it activated itself then had this weird acts like going to one menu to another. whew! i thought it was an unusual thing! this phone really sucks!



29 Answers

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Problem solved. i had the same problem but i fixed it somehow. one day i just took a iron thick pin and pressed the space between number 5 and left-down button(not in the gap). and then i pressed between left-down key. Instantly it started working fine. i dont know whether it was my luck or i just accidently found a solution.Touch Screen 'Back' button on my K850i affected by - 756425f.jpg

Posted on Jun 16, 2009

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Thank you prabhjeet128 !! I had the problem and couldn't fix it at all. I tried your technique of poking it around the D-pad and it now works! Thank you so much :)

Posted on Sep 22, 2009

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Hello, I still own this phone more than 3 years, and i have fixed more than 5 K850i with the same problem.

so, if your touchbuttons are not working at all you have to remove the covers and clean the pads from dust, liquids, or what ever. just use alcohol and a soft ribbon

if your touch buttons are clicking around like crazy when your press other buttons (e.g. # 0 *) then your keyboard cover is broken, unlocked, or is not contacting tight the keyboard pad.
in this situation you have to press all the gaps (between the buttons and around the whole keyboard) with a BIC pen (disassemble the BIC pen and remove the writing nose first). if you do it right, you will hear a "click" sound witch means that the cover is again locked to its position.

>>>Firmware update is not fixing this issue

Posted on Sep 28, 2011

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My phone touch screen buttons are not working at all

Posted on Apr 28, 2010

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I had the same problem - dead touchpad. I followed the instructions to disassembly the phone in "Solution #4" below. Be careful, many clips to release before you can take the phone apart.
Locate the batteries. In the instructions, photo 3 you can see 2 batteries to the right, one third down in the phone. The battery with the yellow sticker is soldered in one end. Carefully lift the other end up, wait a few seconds then put back. Then assemble the phone. This worked for me, it might work for you. Do it at your own risk.
You can check if the screen is working before you assemble the phone. When assemble make sure all clips are in right positions otherwise the phone covers will be uneven when you are done. Spefically the small clear plastic "tongues" at the bottom of the screen. Should fit into the grooves in the top end of the key pad.

Posted on Sep 07, 2009

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Its till doesnt bloody tell me how to fix my phone, when i turn my phonje on the lights just come on, on the buttons and a blue ring light comes on the back by the camera. someone please please tell me how to fix my phone i am in need of some serious help!!!

Posted on Jun 18, 2009

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My K850i just went dead but the but is still lit. anyone have have a solution for this?

Posted on Jan 06, 2009

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I had the same prblm wth ma phone(k850i)the menu button gave me problems and many more.what i did. i took it to asomeone and he made the menu button below ' 0 ' where we have the plus sign and its working.everythng is jst fine.BUT I LOVE THIS PHONE

Posted on Jan 05, 2009

The middle button touch screen key presses it's self.! it's so frustrating, a minute ago i sms'd a friend and i havent bin able to write the next msg. my phone kept freezing, it was ok, then it kept restarting, i couped with that aswell, sometimes my inbox would empty itself, still ok but when this happened i had to do something. i master reset the phone, actually i just got into the master reset menu the phone did the rest and yes..Master resetting doesn't work either.. in trying to fix it i cracked the phone. I've loved all previous sony ericssons but this one's been a hazard since the day i bought it. 

Posted on Oct 16, 2008

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I am having the same problem, have had my phone for 10months and was working fine now my left touch screen button keeps selecting itself. So every time i turn on the phone the media menu opens itself and it takes me about 20mins to write a text because the options menu pops up after every letter. Its very frustrating. Will take it back to carphone warehouse today and see if they can fix it or just give me a new phone.

Didnt realise this was uch a common probolem - do y0ou think it is the same with all touch scree phones?

Posted on Sep 08, 2008

Thats exactly as what happens to mine, if i press number 8 it thinks im pressing the middle touch button, its annoying me now lyk, but its getting worse and it thinks im pressing the middle button no matter what number i press, keeps sending texts to people randomly, and wont let me unlock the keypad, just foned to 02 shop and they said they will send it to get repaired but that cud take up2 a month or longer, am i allowed to ask for a different phone if it dont work? never dropped it or anything, i think i might change to nokia or sumthing but sony erricsson phones always look good lol

Posted on Jul 08, 2008

Exact same thing for me - Middle touchscreen activates itself all the time - other two buttons dont work. This is the second K850I i have had from 02. I am gonna phone them and demand a dif phone - CR*P CR*P Phone.

Posted on Jul 07, 2008

Im having the god damn same problem!!!!!!

SE SUCKS BIG TIME!!! SO SAD I TELL U!!! burning cash on this kinda ****...

Posted on Jul 07, 2008

My softkeys are screwed cant get past the pin lock when I turn my phone on and need to press the select key, the only problem I have is all my numbers are stored on the phone and I cant get them off, someone please help. cant sync my phone to laptop as it is not unlocked!!

Posted on Jul 05, 2008

My friends.. im not alone.. all of u seem to have the problem just like me.. theres 2 ways i think you can try fix this.. warranty..? if not.. prepare the hefty costs.. i think its all to do with mech errors

Posted on May 26, 2008

My problem isworse than all of yours :(
my phones select button (left touch screen button) is selecting my itself but thats not all...when i bring my finger close to any button the select button clicks automaticly but when i keep my hands away it doesnt click :S Weird ...its like a ghost

Posted on May 20, 2008

This is due to the top face where the buttons are situated.It is because the front face is too close to the touchscreen pad you need to open up your phone using screwdrivers and remove dust etc. Look at this website oin how to disassemble your k850i case:-

Posted on May 17, 2008

This phone was amazin for the first few weeks, then, i had to keep reseting master settings, now my main button ( middle touch key) is f**ked!!!! not happy,

anyone know how to fix it? as i got pics of my son in there!

Posted on Apr 14, 2008

I have the same problem except with the menu button. the k850i is a **** phone get rid of it i have had 3 twice the screen went dead and now the touch buttons are stuffed SE is hopeless

Posted on Apr 13, 2008

So im guessin the only solution to the problem is get a new phone..ha

Posted on Mar 11, 2008

i have this kinda problem but abit different.
as when i go to text a message when i press any buttons such as
''t u z x'' any buttons on the keypad, it says im pressing the middle touch screen button.
does any one else have this problem? or know how to fix it?

Posted on Mar 07, 2008

Burn the phone, i had 3 k850i's, all of them messed up in different ways then i demanded a samsung replacement from 02 which is awesome

Posted on Feb 28, 2008

This fone truely sucks.. my touch buttons just broke down too.. nothing happens when i press on them... i need to go get it fixed.. but the problem is that i live in canada.. and i bought the fone in hongkong

Posted on Feb 26, 2008

I have the exact same problem with the 'Select' touch screen button. It now opens the menu screen and text's messages without actually touching t phone

Posted on Feb 17, 2008

Mine is doing the same thing but for the menu/select button so when i try send a text no matter what button i press it selects as well so cant even write a message.

Posted on Feb 01, 2008

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We have the same problem i emailed the sony ericsson and this is the solution for that problems hope it can help...

Thank you for your query, we are sorry to hear of the issues that you are having with your Sony Ericsson K850i.

From the issues that you have described we would suggest that you update the Software on your Sony Ericsson handset. This can be done free of charge using our Sony Ericsson Update Service tool. To carry out the update you will need internet access and a USB cable.

It may be the case that user data is lost during this upgrade. We therefore recommend backing up any data to your SIM card, Memory Stick, or PC before upgrading.

Please follow the steps below to download and install the update service software:

1. Go to
2. Select UK
3. Select your model of handset
4. Click on Sony Ericsson Update Service
5. Click the link, and then click Run or Save.
6. Let the Sony Ericsson Update Service install.

Once you have installed the Sony Ericsson Update Service you will need to launch it. Once it opens simply follow the instructions that you will see on screen. The update should then begin.

In the event that this does not resolve your issue, we recommend that you send your handset to our service location to be examined by our authorised service engineers. The turnaround time for this process is currently on average 3-5 working days, from when the repair centre receives the handset. We offer apologies for any inconvenience this may cause.

Please complete the attached repair form which includes the address to send your handset to. Place your handset in a Jiffy bag and send it via your Post Office obtaining a Proof of Postage receipt.

Please send a copy of your proof of purchase along with the handset in the Jiffy bag, if you do not have a copy of your proof of purchase we will endeavour to validate the handset warranty. Should we not be able to do this we will contact you to supply further information regarding the Proof of Purchase.

Please note that if the damage is not covered by the Sony Ericsson Limited Warranty, there is a fee of £10.00 + VAT to have your product returned should you not accept the estimated costs for repair.

Posted on Aug 13, 2009

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I think the back button selecting it self automatically is a java virus... I installed a few games I downloaded and since then the back button clicks it self after I scroll around the menu for a while. I am going to try some flashing and resetting...

Posted on Jul 29, 2008

I have as well an K850i and suddenly it stopped working while im travelling, so im now stuck without a phone.
that's really annoying, i changed my mind about Sony ericson.

Posted on Feb 02, 2008

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This has happened to my K850i too. Cant do anything with it at all except recieve calls. I took mine back to T-mobile where this bloke said told me it is not a manufacturing defect but a problem with the phones firmwear, whatever that is. He said he could have it sorted within 28 days OR i could have a go at doing it myself. He told me to type in 'K850i firmwear update' and look for a '' link finishing with 'K850i'. From there he said i should plug my phone to my pc via a usb and click on 'Download'. I havent managed to find this site yet, unless im being blind. But if any of you's can go for it. If not take it back to your place or purchase and they can sort it in a few weeks. They will probably give you a phone to use whilst yours is being sorted out. At least you know what the problem might be now.

Posted on Jul 10, 2008

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Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

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