Droid A855 lost signal when dialing starts

macosx1056

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I recently got an used Droid. It shows 3 to 4 bars at home screen. But as soon as it starts dialing in the dialer screen, all bars disappear. I flashed to the stock rom, or rooted it and flashed to CyanogenMod. In either cases, the signal bars go away upon entering dialing. Now I can't even activated by dialing *228 or *22890. I tried to flash to different baseband, but no help.

Signal strength in Setting shows -103 dBm 0 asu. Did anybody have experienced problem like this? Thanks.
 
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