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Sony Ericsson / Sony : Software, Firmware and Drivers : K850i screen switching off and buttons lighting up when sending a text
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Akhtar Posts: 4

Hello,
My K850i works fine, except for when I send a text, half way through sending a text the screen goes black, the buttons light up and it becomes unresponsive. If I wait til it goes into standby (button light turns off) it comes back to life and is normal. It constantly does this and I keep having to wait til standby, it also does this elsewhere when I'm just using the phone.

I tried using sony ericsson update, it said I had the latest update so I reinstalled the software, the problem still didn't go! I also tried flashing it back to the software I was using, via A2 uploader, and this still didn't work (nor did a master reset).

The phone is out of warranty so repairing it will probably be expencive. Does anyone know how to fix this problem?

Thanks for any possible help or suggestions!

EDIT: I just started playing around with the phone, it seems that the phone still works fine when the screen goes black, if I continue typing it is still registered. So I assume its an LCD related problem. But its strange that it generally only happens when I start texting?
[ This Message was edited by: Akhtar on 2009-10-04 17:22 ]

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Posted: 2009-10-04 18:09:20
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mallaccra Posts: > 500

check the ribbon connector that connects the motherboard with the lcd, probably the ribbon socket on either side has loosen and when texting it will pulled the ribbon off the connector and the black screen occurs...

i've not experience such problem and please get other opinions too...
[ This Message was edited by: mallaccra on 2009-10-04 19:03 ]

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Posted: 2009-10-04 20:01:58
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hihihans Posts: > 500

Its your lucky day Here you can find a step by step how to open up your phone and even how to replace your screen.
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Posted: 2009-10-04 21:54:48
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Akhtar Posts: 4

Hello, are you sure its the screen, I don't want to replace it to find out its not actually the screen but something else!

Thanks
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Posted: 2009-10-05 01:53:05
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hihihans Posts: > 500

No I'm not sure but it might be good to open it up and make sure every connector is clean and sits in its place.
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Posted: 2009-10-05 10:15:28
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Akhtar Posts: 4

Thanks, I'll try this, I ordered the screwdriver set, should hopefully come tomorrow, will keep you updated!

Btw, LCD doesn't work at all now, either the connector has completely come off, or the LCD is dead and I'll buy a new one!
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Posted: 2009-10-05 21:02:32
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hihihans Posts: > 500

Good luck mate. Let us know how it goes.
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Posted: 2009-10-05 22:13:06
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coxon Posts: 53

just keenly following this thread...

my k850i has just started doing this... at first the screen went off every so often... however in the past 2 days... just the slightest touch on the left hand size of the keypad (without actually touching a button) the screen will shut off... and keypad lights up...

thinking about ordering a replacement lcd screen.. or replacement keypad... not sure which it would be...

cheers

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Posted: 2009-10-14 03:52:30
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rajafazi Posts: 2

facing same prob.
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Posted: 2009-10-20 19:59:00
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stoney4th Posts: 2

ive started to have same problems as Coxon and A, lcd turns off when:
press the down button
press the number 4
or press gently between number 4 + 5

strange that it has only started to happen since ive given my one month cancellation notice.

master reset doesnt work, im going to try other methods to fix it.....(eg hitting, smashing etc)
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Posted: 2009-11-23 22:08:39
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