can someone be charged if they broke probation in one county doing the crime in another county and has already gone to court because of the probation

When a person violates the terms and/or conditions of probation, then the state of Texas can move to revoke their probation, and ask that they be sent to prison.  Further, if they commit a crime in one county, they can be prosecuted in that county.  Sometimes they can be prosecuted or their crime can be considered in another county by the prosecution. The fact that he turned himself in does not stop him from being prosecuted for the crime(s) he committed in the other county.  Venue (where the crime was committed) is the county where a part or all of the crime(s) were committed.