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As I was cycling, my htc rezound fell on the pavement. The battery popped out.

There are few scratches but no visible damage.

I start the phone and it's fine as long as I don't use data. Once I use data, the phone uses "1" may be it's ev-do. speedtest shows 129 kbps down rate.

I tried flashing and installing a leaked ICS. that didn't solve the problem.

I would think that the damage was because of the physical shock of hitting the ground (nothing broke). so is there a way to diagnose it? to check if 4g is still working?

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Maybe contact the carrier, they may be able to do some test on the device to see if it is actually able to connect to the 4g network. – Ryan Conrad Mar 23 '12 at 14:16

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In the HTC Dream (G1) the UMTS radio (3G) is a separate board from the rest of the phone. While this is a Desire Z and I haven't had the opportunity to take one apart, it's probably very similar.

The 3G/4G daughterboard (or if it's connected, antenna) could have failed, cracked, disconnected or sustained damage in some other way. Software won't fix it. You have damaged hardware.

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is it hard to buy a replacement or my only option is to ship it to htc? – kirill_igum Mar 23 '12 at 17:04
I am not sure only because I don't know exactly what failed. I'd have to look at the Desire Z teardowns to know for sure. – Broam Mar 23 '12 at 17:27
1  
tjworld.net/blog/htc-desire-z-tear-down Does not seem like there's a separate daughterboard. Ship the phone to HTC. – Broam Mar 23 '12 at 17:31
The antennas on the Rezound are built into the battery cover. It could be as simple as a bad contact that could be repaired by replacing the battery cover. – Matt Apr 6 '12 at 21:53

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