6150 Low signal

[chunkhead]

Got a 6150 in the other day with no/little signal! Have opened it, but everything looks good and normal, no water damage etc. Flashed a v5.23 from another perfect working 6150 I have but it has not improved the signal! The highest it will go is 2 bars! And before anyone suggests it, yes I have updated faid, set factory defaults, reset imei, reset DEV, SFR, you name it, i've done it!

Any suggestions?

[Edison]

Have you tried Special Factory Settings(Select all) using Nokia Tool by Jordik? or maybe try another antenna...

[chunkhead]

Yep,
As stated above! Have also tried swapping antenna! Still same signal strength! Any suggestions?