Answers.Body: <p>It sounds like the polyfuse (the fuse that protects the motor circuit) or the motor driver (the chip that switches power on and off to the motors) has failed.</p>
  
  <p>You can contact LEGO customer support and let them know about it. They will probably replace the EV3 if it is determined to be defective.</p>
  
  <p>Or, if you are the do-it-yourself kind of person with surface mount device soldering skills, you could attempt to replace the components yourself.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-06-05T19:11:03.450Z
Answers.Text: A and B share the same driver chip on EV3. So it can't be the polyfuse. Probably the driver indeed, Could also be the RJ connector...
Answers.UserDisplayName: Philo
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-06-04T20:25:30.633Z
Answers.LastActivityDate: 2017-06-04T20:25:30.633Z
Answers.UserDisplayName: David Lechner
Body: <p>I have an EV3 running RobotC version 4.55. </p>
  
  <p>The medium motor connected to Port A does not run, but if I connect it to another port (B,C,or D) it works. I tested it manually through the EV3 motor tab and with a program. I also tried connecting other motors to port A and they do not work there. </p>
  
  <p>Is there something I can do to "revive" port A?</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-06-02T16:36:23.910Z
Comments.Text: When you say "does not work", do you mean that it does not run at all?
Comments.UserDisplayName: David Lechner
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-06-04T15:10:46.270Z
Comments.Text: Correct, any motor connected to that port will not run
Comments.UserDisplayName: Narno
Tags: <ev3><mindstorms><repair>
Title: Is it possible to fix a broken EV3 Port?
UserDisplayName: Narno
ThreadText: # Is it possible to fix a broken EV3 Port?
  
  (Asked by: username_0 on 2017-06-02)
  
  I have an EV3 running RobotC version 4.55.
  
  The medium motor connected to Port A does not run, but if I connect it to another port (B,C,or D) it works. I tested it manually through the EV3 motor tab and with a program. I also tried connecting other motors to port A and they do not work there.
  
  Is there something I can do to "revive" port A?
  
  **Tags:** ev3, mindstorms, repair
  > **Comments:**
  > **username_1**: When you say "does not work", do you mean that it does not run at all?  
  > **username_0**: Correct, any motor connected to that port will not run  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2017-06-04. Score: 1
  
  It sounds like the polyfuse (the fuse that protects the motor circuit) or the motor driver (the chip that switches power on and off to the motors) has failed.
  
  You can contact LEGO customer support and let them know about it. They will probably replace the EV3 if it is determined to be defective.
  
  Or, if you are the do-it-yourself kind of person with surface mount device soldering skills, you could attempt to replace the components yourself.
  
  > **Comments:**
  > **username_2**: A and B share the same driver chip on EV3. So it can't be the polyfuse. Probably the driver indeed, Could also be the RJ connector...  
  
  ---
  
  