xperia arc s no network registerd or no connection

Sony ericsson experia network connection error.
experia network not registered. 
Experia no service problem.
Experia no signal.

sony ericsson experia have  many model but i notice that the signal problem is very complicated.today i will tell you how to remove this problem completely.if you have experia arc s and it have a signal or network not registered problem then you read carefully this post and its also for every experia model.

1.fast of all you check your mobile signal in network search.if no network pop up then you check you  check signal wire. i show in  below picture.
2.If you have network work but signal strength  is low then you dail *#*#4636#*#* then you go in phone  information there you set the preferred network.if you have WCDMA preferred then you set in WCDMA only and turn off the radio. after few second and then turn on the radio.
3.if problem is network not registered on this network when you search the manual network.then you change the diode i show in below picture.but some time the mobile phone OS damage so i suggest you fast of update the software. if problem still then you change the diode.

If you have any problem then you feel free and contact to me to passe the comments