Question about Samsung SGH-U700 Cellular Phone

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Samsung u700 - touch keys remain on but no display

My samsung sgh-u700 just developed this strange problem. The touch sensitive keys remain lit (number keys does not), but there's no display. It simply hangs. when i remove and replug the battery, the same happens. Lights will go on instantly but does not respond to switching on.

When I plug the device via usb without battery and sim, instead of the flickering lights I still get the lit keys. Hence i can't even update the firmware.

How can I resolve this?

Thanks I have a similar scenario. I couldn't reboot the phone earlier because then I knew I would go offline and wouldn't be able to go back online. I finally had to reboot the phone but since I haven't been able to activate sim password despite being able to input the digits. The touch keys are constantly on but no display.  I eliminated the display by pressing any of the keys on the keyboard for any display and result was positive.
Please assist...

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  • 378 Answers

Replace the battery as its drained now so the device is not getting require charge to function normally.this is common if battery drains.

Posted on Jan 22, 2009

  • machine83 Jan 22, 2009

    its the problem of the internal circuit which supports the display to function properly.other wise the battery is faulty.
    to have a look as what part is located where in a cell phone. how to open the cell phone .where is the ic and the display board just click the link below
    http://electronics.howstuffworks.com/cel...



    the brand of cell phone is differnt in the link but the system is same in all the cell phones.



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2 Answers

Having a sound problem when sliding up my SAMSUNG SGH-U700 phone


It will be problem on the strip of ur phone, 
Just Contact to Authorized Service center to solve.

May 09, 2010 | Samsung SGH-U700 Cellular Phone

2 Answers

Touch Keys and Screen


I think this a problem related to the flex cable that connects the main phone body to the sliding screen. Over time the flex cable wears down as it slides and results in a whole range or problems such as: display acting weird (eg. mirror-image and inverted colours), speaker not working, off-button not working etc.
Flex cables are cheap to buy on ebay (a few dollars) and there's internet sites that show you how to open the phone and replace them. (google: samsung u700 replacement flex cable)

Jul 13, 2009 | Samsung SGH-U700 Cellular Phone

1 Answer

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please cntact to your samsung care and its lcd screen goes to destroy or you can format your phone by pressing *2767*3855#

May 27, 2009 | Samsung SGH-U700 Cellular Phone

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I don't know on the e900... but U700 has this problem when the flex cable is broken.. see this guide.

Mar 17, 2009 | Samsung SGH-U700 Cellular Phone

1 Answer

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sounds like a flex connector problem. have it replaced asap.

Feb 20, 2009 | Samsung SGH-U700 Cellular Phone

1 Answer

My SGH-U700 touch sensitive keys and the function keys are not working. i can see the screen, and i can enter number. please help?


Usually the pins on the FLEX shorts out when liquid gets between the connectors and dries. Or the connectors are just loose, this is because you don't take good care of your phone.

Well you have to let someone replace/reconnect/check the FLEX of the phone, Replace cost's around $20-$40 (or around 200-500Php)

Jan 31, 2009 | Samsung SGH-U700 Cellular Phone

2 Answers

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Contact Samsung, or your mobile provider for a software update. Alternatively you could flash the software yourself.

Oct 25, 2008 | Samsung SGH-U700 Cellular Phone

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