PCB Trace Repair (Need to keep track shape?)
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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 PCB
trace
asked Dec 19 '18 at 23:57
Newbie ET
111
add a comment |
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 PCB
trace
asked Dec 19 '18 at 23:57
Newbie ET
111
add a comment |
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 PCB
trace
asked Dec 19 '18 at 23:57
Newbie ET
111
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 PCB
trace
trace
asked Dec 19 '18 at 23:57
Newbie ET
111
asked Dec 19 '18 at 23:57
Newbie ET
111
asked Dec 19 '18 at 23:57
Newbie ET
111
asked Dec 19 '18 at 23:57
Newbie ET
111
asked Dec 19 '18 at 23:57
Newbie ET
111
111
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
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.
answered Dec 20 '18 at 0:53
DrMoishe Pippik
6966
add a comment |
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.
answered Dec 20 '18 at 0:06
laptop2d
23.4k123175
It could also be meant as a fuse.
– TimWescott
Dec 20 '18 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 '18 at 1:13
@NewbieET meta.stackexchange.com/questions/126180/…
– laptop2d
Dec 20 '18 at 16:05
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
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.
answered Dec 20 '18 at 0:53
DrMoishe Pippik
6966
add a comment |
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.
answered Dec 20 '18 at 0:53
DrMoishe Pippik
6966
add a comment |
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.
answered Dec 20 '18 at 0:53
DrMoishe Pippik
6966
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.
answered Dec 20 '18 at 0:53
DrMoishe Pippik
6966
answered Dec 20 '18 at 0:53
DrMoishe Pippik
6966
answered Dec 20 '18 at 0:53
DrMoishe Pippik
6966
answered Dec 20 '18 at 0:53
DrMoishe Pippik
6966
6966
add a comment |
add a comment |
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.
answered Dec 20 '18 at 0:06
laptop2d
23.4k123175
It could also be meant as a fuse.
– TimWescott
Dec 20 '18 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 '18 at 1:13
@NewbieET meta.stackexchange.com/questions/126180/…
– laptop2d
Dec 20 '18 at 16:05
add a comment |
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.
answered Dec 20 '18 at 0:06
laptop2d
23.4k123175
It could also be meant as a fuse.
– TimWescott
Dec 20 '18 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 '18 at 1:13
@NewbieET meta.stackexchange.com/questions/126180/…
– laptop2d
Dec 20 '18 at 16:05
add a comment |
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.
answered Dec 20 '18 at 0:06
laptop2d
23.4k123175
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.
answered Dec 20 '18 at 0:06
laptop2d
23.4k123175
edited Dec 20 '18 at 0:16
answered Dec 20 '18 at 0:06
laptop2d
23.4k123175
answered Dec 20 '18 at 0:06
laptop2d
23.4k123175
answered Dec 20 '18 at 0:06
laptop2d
23.4k123175
23.4k123175
It could also be meant as a fuse.
– TimWescott
Dec 20 '18 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 '18 at 1:13
@NewbieET meta.stackexchange.com/questions/126180/…
– laptop2d
Dec 20 '18 at 16:05
add a comment |
It could also be meant as a fuse.
– TimWescott
Dec 20 '18 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 '18 at 1:13
@NewbieET meta.stackexchange.com/questions/126180/…
– laptop2d
Dec 20 '18 at 16:05
It could also be meant as a fuse.
– TimWescott
Dec 20 '18 at 0:14
It could also be meant as a fuse.
– TimWescott
Dec 20 '18 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 '18 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 '18 at 1:13
@NewbieET meta.stackexchange.com/questions/126180/…
– laptop2d
Dec 20 '18 at 16:05
@NewbieET meta.stackexchange.com/questions/126180/…
– laptop2d
Dec 20 '18 at 16:05
add a comment |
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