PCB Trace Repair (Need to keep track shape?)












2














Need to repair a trace on my PCB. The burnt trace has a hairpin turn on it. Instead of following the same hairpin shape, can I just bridge across the undamaged points at the bottom? And also, the printed "TF b=0.4mm" on the PCB, does it have any significance to it? Next to it appears 0.6mm that has the same hairpin shape, but trace looks a bit wider. I have superimposed two pics together. One has light shone through the PCBpcb










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    Need to repair a trace on my PCB. The burnt trace has a hairpin turn on it. Instead of following the same hairpin shape, can I just bridge across the undamaged points at the bottom? And also, the printed "TF b=0.4mm" on the PCB, does it have any significance to it? Next to it appears 0.6mm that has the same hairpin shape, but trace looks a bit wider. I have superimposed two pics together. One has light shone through the PCBpcb










    share|improve this question







    New contributor




    Newbie ET is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      2












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      2







      Need to repair a trace on my PCB. The burnt trace has a hairpin turn on it. Instead of following the same hairpin shape, can I just bridge across the undamaged points at the bottom? And also, the printed "TF b=0.4mm" on the PCB, does it have any significance to it? Next to it appears 0.6mm that has the same hairpin shape, but trace looks a bit wider. I have superimposed two pics together. One has light shone through the PCBpcb










      share|improve this question







      New contributor




      Newbie ET is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      Need to repair a trace on my PCB. The burnt trace has a hairpin turn on it. Instead of following the same hairpin shape, can I just bridge across the undamaged points at the bottom? And also, the printed "TF b=0.4mm" on the PCB, does it have any significance to it? Next to it appears 0.6mm that has the same hairpin shape, but trace looks a bit wider. I have superimposed two pics together. One has light shone through the PCBpcb







      trace






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      asked Dec 19 at 23:57









      Newbie ET

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          2 Answers
          2






          active

          oldest

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          12














          Since they're labeled TF, it's safe to state they're thermal fuses.



          Therefor, since inductance is likely irrelevant, you could replace them with through-hole fuses of the correct value. The current value depends on copper layer thickness, but for 1 oz. Cu, 0.4 mm would be about 1.5 A and 0.6 mm ~2.5 A... but it would be better to find out what the actual current ratings are.



          N.B. Since that 0.4 mm trace is thoroughly fried, first fix the issue that burned it out. The fuse has a purpose, and it likely prevented further damage or even a fire, so don't just bypass it.






          share|improve this answer





























            0














            Keep the track shape, the design probably intended either forming an inductor from the trace or a thermal separation or fuse. Keep the wire's cross sectional area to be a similar size of the trace. If you do make a repair, make sure the root cause of the burned trace is identified, otherwise a wire repair may end up burning out also.






            share|improve this answer























            • It could also be meant as a fuse.
              – TimWescott
              Dec 20 at 0:14










            • Thank you for those who have answered. Besides the fried trace, there's also an exploded varistor (14D241K) on the other side of the PCB. The two legs above the burnt hairpin is where the varistor is soldered. I guess it's all part of the voltage surge protection. I plan to replace the varistor, just not sure how to proceed with the hairpin trace. Great input from you guys.
              – Newbie ET
              Dec 20 at 1:13










            • @NewbieET meta.stackexchange.com/questions/126180/…
              – laptop2d
              Dec 20 at 16:05











            Your Answer





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            2 Answers
            2






            active

            oldest

            votes








            2 Answers
            2






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            12














            Since they're labeled TF, it's safe to state they're thermal fuses.



            Therefor, since inductance is likely irrelevant, you could replace them with through-hole fuses of the correct value. The current value depends on copper layer thickness, but for 1 oz. Cu, 0.4 mm would be about 1.5 A and 0.6 mm ~2.5 A... but it would be better to find out what the actual current ratings are.



            N.B. Since that 0.4 mm trace is thoroughly fried, first fix the issue that burned it out. The fuse has a purpose, and it likely prevented further damage or even a fire, so don't just bypass it.






            share|improve this answer


























              12














              Since they're labeled TF, it's safe to state they're thermal fuses.



              Therefor, since inductance is likely irrelevant, you could replace them with through-hole fuses of the correct value. The current value depends on copper layer thickness, but for 1 oz. Cu, 0.4 mm would be about 1.5 A and 0.6 mm ~2.5 A... but it would be better to find out what the actual current ratings are.



              N.B. Since that 0.4 mm trace is thoroughly fried, first fix the issue that burned it out. The fuse has a purpose, and it likely prevented further damage or even a fire, so don't just bypass it.






              share|improve this answer
























                12












                12








                12






                Since they're labeled TF, it's safe to state they're thermal fuses.



                Therefor, since inductance is likely irrelevant, you could replace them with through-hole fuses of the correct value. The current value depends on copper layer thickness, but for 1 oz. Cu, 0.4 mm would be about 1.5 A and 0.6 mm ~2.5 A... but it would be better to find out what the actual current ratings are.



                N.B. Since that 0.4 mm trace is thoroughly fried, first fix the issue that burned it out. The fuse has a purpose, and it likely prevented further damage or even a fire, so don't just bypass it.






                share|improve this answer












                Since they're labeled TF, it's safe to state they're thermal fuses.



                Therefor, since inductance is likely irrelevant, you could replace them with through-hole fuses of the correct value. The current value depends on copper layer thickness, but for 1 oz. Cu, 0.4 mm would be about 1.5 A and 0.6 mm ~2.5 A... but it would be better to find out what the actual current ratings are.



                N.B. Since that 0.4 mm trace is thoroughly fried, first fix the issue that burned it out. The fuse has a purpose, and it likely prevented further damage or even a fire, so don't just bypass it.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Dec 20 at 0:53









                DrMoishe Pippik

                6966




                6966

























                    0














                    Keep the track shape, the design probably intended either forming an inductor from the trace or a thermal separation or fuse. Keep the wire's cross sectional area to be a similar size of the trace. If you do make a repair, make sure the root cause of the burned trace is identified, otherwise a wire repair may end up burning out also.






                    share|improve this answer























                    • It could also be meant as a fuse.
                      – TimWescott
                      Dec 20 at 0:14










                    • Thank you for those who have answered. Besides the fried trace, there's also an exploded varistor (14D241K) on the other side of the PCB. The two legs above the burnt hairpin is where the varistor is soldered. I guess it's all part of the voltage surge protection. I plan to replace the varistor, just not sure how to proceed with the hairpin trace. Great input from you guys.
                      – Newbie ET
                      Dec 20 at 1:13










                    • @NewbieET meta.stackexchange.com/questions/126180/…
                      – laptop2d
                      Dec 20 at 16:05
















                    0














                    Keep the track shape, the design probably intended either forming an inductor from the trace or a thermal separation or fuse. Keep the wire's cross sectional area to be a similar size of the trace. If you do make a repair, make sure the root cause of the burned trace is identified, otherwise a wire repair may end up burning out also.






                    share|improve this answer























                    • It could also be meant as a fuse.
                      – TimWescott
                      Dec 20 at 0:14










                    • Thank you for those who have answered. Besides the fried trace, there's also an exploded varistor (14D241K) on the other side of the PCB. The two legs above the burnt hairpin is where the varistor is soldered. I guess it's all part of the voltage surge protection. I plan to replace the varistor, just not sure how to proceed with the hairpin trace. Great input from you guys.
                      – Newbie ET
                      Dec 20 at 1:13










                    • @NewbieET meta.stackexchange.com/questions/126180/…
                      – laptop2d
                      Dec 20 at 16:05














                    0












                    0








                    0






                    Keep the track shape, the design probably intended either forming an inductor from the trace or a thermal separation or fuse. Keep the wire's cross sectional area to be a similar size of the trace. If you do make a repair, make sure the root cause of the burned trace is identified, otherwise a wire repair may end up burning out also.






                    share|improve this answer














                    Keep the track shape, the design probably intended either forming an inductor from the trace or a thermal separation or fuse. Keep the wire's cross sectional area to be a similar size of the trace. If you do make a repair, make sure the root cause of the burned trace is identified, otherwise a wire repair may end up burning out also.







                    share|improve this answer














                    share|improve this answer



                    share|improve this answer








                    edited Dec 20 at 0:16

























                    answered Dec 20 at 0:06









                    laptop2d

                    23.3k123175




                    23.3k123175












                    • It could also be meant as a fuse.
                      – TimWescott
                      Dec 20 at 0:14










                    • Thank you for those who have answered. Besides the fried trace, there's also an exploded varistor (14D241K) on the other side of the PCB. The two legs above the burnt hairpin is where the varistor is soldered. I guess it's all part of the voltage surge protection. I plan to replace the varistor, just not sure how to proceed with the hairpin trace. Great input from you guys.
                      – Newbie ET
                      Dec 20 at 1:13










                    • @NewbieET meta.stackexchange.com/questions/126180/…
                      – laptop2d
                      Dec 20 at 16:05


















                    • It could also be meant as a fuse.
                      – TimWescott
                      Dec 20 at 0:14










                    • Thank you for those who have answered. Besides the fried trace, there's also an exploded varistor (14D241K) on the other side of the PCB. The two legs above the burnt hairpin is where the varistor is soldered. I guess it's all part of the voltage surge protection. I plan to replace the varistor, just not sure how to proceed with the hairpin trace. Great input from you guys.
                      – Newbie ET
                      Dec 20 at 1:13










                    • @NewbieET meta.stackexchange.com/questions/126180/…
                      – laptop2d
                      Dec 20 at 16:05
















                    It could also be meant as a fuse.
                    – TimWescott
                    Dec 20 at 0:14




                    It could also be meant as a fuse.
                    – TimWescott
                    Dec 20 at 0:14












                    Thank you for those who have answered. Besides the fried trace, there's also an exploded varistor (14D241K) on the other side of the PCB. The two legs above the burnt hairpin is where the varistor is soldered. I guess it's all part of the voltage surge protection. I plan to replace the varistor, just not sure how to proceed with the hairpin trace. Great input from you guys.
                    – Newbie ET
                    Dec 20 at 1:13




                    Thank you for those who have answered. Besides the fried trace, there's also an exploded varistor (14D241K) on the other side of the PCB. The two legs above the burnt hairpin is where the varistor is soldered. I guess it's all part of the voltage surge protection. I plan to replace the varistor, just not sure how to proceed with the hairpin trace. Great input from you guys.
                    – Newbie ET
                    Dec 20 at 1:13












                    @NewbieET meta.stackexchange.com/questions/126180/…
                    – laptop2d
                    Dec 20 at 16:05




                    @NewbieET meta.stackexchange.com/questions/126180/…
                    – laptop2d
                    Dec 20 at 16:05










                    Newbie ET is a new contributor. Be nice, and check out our Code of Conduct.










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