Fingerprint sensor died, no reason? :(

The fingerprint sensor has died without any reason. I don't know why it's dead as well as what caused the problem to fingerprint sensor. I tried to use it but it's unusable, even I tried to hard-reset, it's dead. When I type 3845*#820# and test the fingerprint, the screen report that "ER02 Unable to communicate with sensor" and ...

I'm still using the original ROM, I thought it's not depend on the software inside, maybe the hardware problem. I thought I can fix it again (I have fixed the hardware keyboard problem). The the coating of bio scanner is still on it, no scratch, no damage, just stop working. As the error show, I thought the sensor has disconnected to the front button main board or circuit. I can press it to do "OK" but cannot navigate so I thought one of the sockets that sticked the sensor onto the main board has been gaping. I will repair it by myself again and report the success or failure here. :p

bk9sw I wonder if it might be a humidity issue because I have had numerous phones, buttons stop working randomly all because off the high humidity level here in Houston, also my fingerprint reader on my expo will sometimes stop working, maybe once every 2-3 weeks and soft reseting does nothing I just wait and it starts working again. Also this humidity problem seems to flare if you were in a dry climate for a while then go to a damp climate.

I'm living in Vietnam now, the weather here is hot all the year and obviously low humidity. I know the weather in Houston, Texas that makes electronic devices damage. However, I will try this way and hope it will work again. Thanks man! :p