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Please Help - K800i - Signal problems after whack!

by stu_h    Nov 14, 2007, 7:13 PM


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Managed to give my K800i a serious whack. Now have problem where the signal is low but intermittently so. I'm also getting a lot of "Emergency Calls Only" and "No Network Coverage" messages - I guess because of the poor signal. The signal strength seems to fluctuate a lot if I'm holding the phone. If I leave it in one spot I get about 4 bars (out of 5) and "My Phone Explorer" shows only about 39% (-73dBm), I would usuallly be getting 5 bars and about 70% on a good day (I'm out in the sticks a bit with no 3G coverage sadly). The local coverage is normally good enough that I maintain a signal at all times. It's not some weird coincedence because I can put the sim into an on old panasonic and get full strength with no problems.
I've opened it up and can't spot anything obvious. I have another K800 that won't even start (display just flashes) so can compare the two physically but can't really swap components as the main circuit board on that one is slightly bent (another even worse "whack") and the LCD is cracked (though flashes).

The metal cover that shields the back of the camera unit seems to pop off too easily but that shouldn't cause a problem. Should it?

I assume that the antenna is the circuit stuck onto the grey speaker housing at the top of the phone (it has UMTS written on it). If I'm right about that it all seems OK. The two flexible metal contacts seem to make good connections.

Can anyone offer any suggestions (apart from be more careful!)? I'm wondering if the external antenna 'socket' under the rubber bung could be used to check if the internal antenna is not functioning OK.... if so anyone know the best place to get an external antenna. That's assuming I'm correct in thinking the rubber bung is the external input?

I'm wondering where the antenna signal goes to on the main circuit board, it isn't really easy to see it. Anyone have more info on the phone or can even suggest anywhere I could take it/send it to for a reasonably priced once over? I am an electronics engineer by training but not when it comes to phones!

Thank you for any help.


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