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???
06/21/10 08:29
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#176797 - Fuse?
Responding to: ???'s previous message
Is it a PC with a fuse that needs to be replaced (most probably by soldering)?

Better motherboards normally have either a self-resetting termo fuse, or a dedicated chip (electronic fuse) that measures the current and deactivates the output at too high load. But some motherboards adds a soldered melting fuse or even skips the fuse alltoghether, resulting in a damaged PCB trace (or possibly a burned 0 ohm resistor).

A damaged PCB trace or 0 ohm resistor, or a pico-fuse that needs to be replaced is often quite easy to fix, even if it is bad workmanship to build such a motherboard.

If the motherboard has an intelligent chip that for some reason dies (possibly by too high initial current before the chip reacts), it can be quite tricky to fix the mb.

The actual USB PHY should normally not be damaged by any overcurrent, since it is intended to handle D+ and D- and is normally not involved in the USB power output.

List of 33 messages in thread
TopicAuthorDate
DC / DC Convertor            01/01/70 00:00      
   OK            01/01/70 00:00      
   that is not possible            01/01/70 00:00      
      Clarification            01/01/70 00:00      
         Select 9-12V with a capacity to supply up to 20mA            01/01/70 00:00      
            I think I see what is needed            01/01/70 00:00      
               Per forgot            01/01/70 00:00      
                  Incorrect....            01/01/70 00:00      
                     incorrect?            01/01/70 00:00      
   Getting power from the USB port            01/01/70 00:00      
      OK for Development            01/01/70 00:00      
         Required points clarified - thanks            01/01/70 00:00      
            trying again            01/01/70 00:00      
         re: OK?            01/01/70 00:00      
            The Curse Of Stuff That "Works" (sic)            01/01/70 00:00      
               USB has provisions for 1.8A from charger ports            01/01/70 00:00      
         I should know better, word of warning            01/01/70 00:00      
            Worse :(            01/01/70 00:00      
               Fuse?            01/01/70 00:00      
                  With picture            01/01/70 00:00      
                     And the external USB connectors?            01/01/70 00:00      
                     Is that really a PC motherboard?!            01/01/70 00:00      
                        Unusual USB connector.            01/01/70 00:00      
                           It all looks a bit "chunky"...            01/01/70 00:00      
                        It's a front panel board            01/01/70 00:00      
                     Both Ports??            01/01/70 00:00      
                        Yes, both ports            01/01/70 00:00      
                           Fusing S/B on main board            01/01/70 00:00      
                           Poor C6...            01/01/70 00:00      
               Bolt that stable door!            01/01/70 00:00      
      Really?            01/01/70 00:00      
         Standby?            01/01/70 00:00      
      RE: Getting power from the USB            01/01/70 00:00      

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