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I have experienced a weird problem with my k750. About two months ago the display suddenlty turned to whitish grey, showing everything like through a white curtain. I can see things on the screen but everything is faded and very hard to see in bright light. Sometimes there are vertical lines. Reducing brightness doesnt make it any better.

After about a month of this situation, one morning the display went back to normal. After another two weeks, the screen turned white again and stayed like this untill now.

- I upgraded firmware through SEUS to the newset, but no change with the screen.
- I took apart the phone completely, cleaned up all the insides, unplugged the screen connector from board and cleaned that also, but nothing helped, the screen stays grey all the same.
- I tried to use a few modified display drivers but no change also.
- I did a complete master reset, without any effect on the screen.
- I did a reflash of FS through DaVinci flasher, situation got much worse, screen became inverted and grey at the same time.
- After reflashing MAIN, the situation got a little better, meaning it is slightly less 'whitish' and a little more readable, but far from normal. The interesting thing is that when I reflash MAIN again, the situation goes back to worse - as if one flashing of the MAIN did make a little difference but another identical MAIN flashing didnt.

Since I saw that reflash did make a little difference, making it sometimes worse and sometimes little better, I wonder if it is a software problem. I am not aware of dropping the phone although I have been using it for about three years now.

Anyone has any idea what could cause this and if I could fix it? Very thankful for any tips.

[ This Message was edited by: lugus on 2007-09-28 14:29 ]
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Posted: 2007-09-28 15:23:43
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this means that your problem is hardware-ish.
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Posted: 2007-09-28 15:31:56
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I know there is also such an alternative but how would that explain two weeks when the display worked normally and then it went bad again? Is there any sort of a test one can do to make sure its a hardware problem?

Interestingly enaugh, when I run the test in service menu for screen, all three testing windows are shown as I am used to see everything else, that is behind a curtain, except for the last screen, that shows narrower colorful vertical stripes where I see them without a curtain.
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Posted: 2007-09-28 15:42:40
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that's what i say. it started working well but it went back to malfunction again. this is something wrong with the lcd. try a new one.
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Posted: 2007-09-28 15:52:26
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I'd suspect your LCD's on it's way out, it'll probably need replacing I'm afraid!
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Posted: 2007-09-28 16:51:09
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Its prob wid ur hardware but not Lcd. Maybe some cable system inside cell But not lcd i m sure abt it.
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Posted: 2007-10-01 12:48:00
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yep i would too suggest to change the LCD.
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Posted: 2007-10-01 15:36:17
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Thanks for suggestions. Does someone have other ideas appart from LCD replacement that I could try? Relacing an LCD is more like getting a new phone. It appears it really is a quite rare phenomenon.

Any ideas what can be done with an almost screen-less phone and how else it can be used?
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Posted: 2007-10-01 15:53:10
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I had a similar problem with the k750 of my girlfriend last summer but I managed to fix it by opening the phone and cleaning.
It began with occasional disappearance (whitening) of parts of the screen and restarting helped for a while but then it was permanent until I dismounted the phone.
Several modules of the phone are completely removable (among them is the LCD screen).
When you disconnect the screen (there’s a small port connection on the main board, just like in computers) you should clean the connector. I used alcohol and cotton.
There have been several months after that and no problems.
To check if this is the case with your phone you can turn it on before closing the case and check if it is the connector.

A month ago a similar thing happened with my w800 but I was too lazy opening.
Instead I restarted the phone few times while pressing on the casing where the connector is situated (close to buttons 3 and 6).
Amazingly it worked too, so I guess it may have been a loose connector this time.
And again I had no problems after that.

PS
Most of the parts of these phones are removable which allows cleaning and fixing. Unfortunately the joystick base is not.

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Posted: 2007-10-01 16:26:58
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