circut board repair on bobcat

[stevep3916]

my name is steve. i have a circut board from a bobcat skid steer that has a bad componet or 2 on it. would anybody care to help see if i can repair this board? i dont have a circut diagram, but i have a wiring diagram of the loader this board is very expensive 1,000.00+ and the machine has to be hauled to a dealer to have the board programmed which will cost another 5-700.00 .  any help would be appreciated  the componet that was where the burned spot on the board is in a picture with all the marking i could find on it  again thanks for any help

[stevep3916]

i am having trouble attaching picture of board, message sez file too large

[james_s]

Make the file smaller. If you're running Windows try a free utility called IrfanView, it's great. If you're on Linux then Pinta works similarly. There will be something similar on Mac but I don't know what.

[joeqsmith]

Post some high res pictures of the board.  Some close ups of the damaged area.    What is your background?  Do you have the skills to do the repairs? 

[stevep3916]

i am retired electrician, my father was an electronic tech but he passed away some years ago, i know how to solder and have a general knowledge of electronics however not a lot about digital , i dont understand about reducing size of file but could email pictures of board and componet that failed  my email address is stevep3916@gmail.com  once again any help would be greatly appreciated  thanks  steve

[james_s]

Download and install Irfanview, open the file, from the edit menu select resize/resample and change the resolution to something reasonable like 1600x1200 and then save as and post that file. There are lots of tutorials out there, resizing photos is a very simple and useful procedure that only takes a few minutes to learn.

[stevep3916]

is this any better?

[james_s]

Yes, although now it's a bit too small to see clearly, you could also get some extra detail for free by cropping it prior to shrinking it. Did it get wet? At a glance that looks like rust.

[joeqsmith]

That poor board.  Try to zoom into that damaged area.   

[Cyberdragon]

Yes, although now it's a bit too small to see clearly, you could also get some extra detail for free by cropping it prior to shrinking it. Did it get wet? At a glance that looks like rust.

Just looks like conformal coating to me.

[stevep3916]

board was exposed to mud and water , bobcat mounts this in machine in the frame beside where your feet are, it is behind an access panel in a plastic case that has vents ,  very stupid place imo, this is componet that burnt out, board had a thin coating of flexible material about 1/8 inch thick on it i removed some around the same kind of chip hoping this would help identify, this is a very common problem with these boards of this age app. 1998-99 which is another reason i would like to repair this not buy another 1 which will probably fail in the same way in the future i cant for the life of understand why this is mounted in the machine where it  thanks steve

[joeqsmith]

Old Siemens part, BTS621L1.   This is a high side driver.   They are protected (normally).  Looks like they are still available. 

https://www.digikey.com/products/en/integrated-circuits-ics/pmic-power-distribution-switches-load-drivers/726?k=bts621