Hello, everyone.

I am completely new to this type of repair so be easy. Lol

I have a Burndy crimping tool and and I was doing some maintenance on it and hooked up the battery to the terminals via alligator clips to check if they were working properly and got them crossed. The tool works with the battery in but it does not shut off. Just keeps running.

i took a look at the circuit board and noticed that some pad look like they got burned off or something? I don’t really know if that’s what it is or not.
Can someone point me in the right direction on how to get this working right again? What materials I would need? Tools? Etc

I appreciate all the help and input.

pic for reference.

 

hi Db,
Please post a clear photo of both sides of the PCB
E

 

Sorry Didn’t upload in the original post

 

what pads you think look burned? and can you make image a bit sharper? what is the part number of U1? also where is the picture of PCB backside?

 

what pads you think look burned? and can you make image a bit sharper? what is the part number of U1? also where is the picture of PCB backside?

I can get a better picture and a picture of the backside tonight when I get home from work.

This is my first time looking at a PCB so forgive my ignorance. What is U1?

 

Can someone point me in the right direction on how to get this working right again?

You probably fried one or more of the ICs. That's what happens when power to them is reversed. Sometimes damage is visible on the package, sometimes not.

 

picture is blurry but there seem to be crater in U1 above pin2. if true that would be hallmark of emergency exhaust for magic smoke

 

picture is blurry but there seem to be crater in U1 above pin2. if true that would be hallmark of emergency exhaust for magic smoke

View attachment 367166

I found another picture I took and tried to adjust it to make it a little more visable.
But there is a crater on it. I’m assuming by that is going to have to be replaced? Where would I find a replacement?

 

Where would I find a replacement?

Search for the part number on the device.

Are you qualified to remove and replace surface mount devices? If you aren't, then you need to take it to someone who can.

 

...if you can identify the part and find replacement and if no other damage exist.

 

Here are some better pictures (I hope). What do yall think? Is it just the u1 that got damaged?

 

Is it just the u1 that got damaged?

Can't say. As I said, some ICs that get destroyed by reverse voltage don't show external signs. The only way to tell for certain is to replace the obviously bad ICs and proceed from there. If the device still doesn't work, there are more problems to be tracked down.

 

the pictures are still unreadable. to be of any use one must clearly see the labels on all parts.
U1 is definitely damaged but it may not be the only victim. the package is flavor of D2PACK.... looks like TO-263-5-2. but also pins 4 and 5 are shorted permanently.
what i seem to recognize looks like "ADIR???3" os similar.

based on function and unique package my best guess is that this may be an Infineon part AUIR3313S

https://www.digikey.ca/en/products/detail/infineon-technologies/AUIR3313S/2605405

btw, C2 also looks tanned...

 

the pictures are still unreadable. to be of any use one must clearly see the labels on all parts.
U1 is definitely damaged but it may not be the only victim. the package is flavor of D2PACK.... looks like TO-263-5-2. but also pins 4 and 5 are shorted permanently.
what i seem to recognize looks like "ADIR???3" os similar.

based on function and unique package my best guess is that this may be an Infineon part AUIR3313S

https://www.digikey.ca/en/products/detail/infineon-technologies/AUIR3313S/2605405

btw, C2 also looks tanned...

I did some research on the and it is the AUIR3313S. I found some and it will be shipped to me in a week or so. I’ll try to take better pictures with better lighting/camera. Gotta watch a crash course on YouTube so I can better understand what’s going on. Lol

I appreciate everyone’s help!