circut board repair on bobcat - Page 1
Forum section: electronics / repair

author: stevep3916
author_rank: Newbie
timestamp: December 15, 2017, 04:34:16 am
content: 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

author: stevep3916
author_rank: Newbie
timestamp: December 15, 2017, 04:48:39 am
content: i am having trouble attaching picture of board, message sez file too large

author: james_s
author_rank: Super Contributor
timestamp: December 15, 2017, 07:49:03 pm
content: 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.

author: joeqsmith
author_rank: Super Contributor
timestamp: December 15, 2017, 08:11:21 pm
content: 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?

author: stevep3916
author_rank: Newbie
timestamp: December 15, 2017, 11:27:30 pm
content: 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

author: james_s
author_rank: Super Contributor
timestamp: December 15, 2017, 11:29:22 pm
content: 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.

author: stevep3916
author_rank: Newbie
timestamp: December 16, 2017, 01:31:19 am
content: is this any better?

author: james_s
author_rank: Super Contributor
timestamp: December 16, 2017, 01:35:28 am
content: 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.

author: joeqsmith
author_rank: Super Contributor
timestamp: December 16, 2017, 01:42:19 am
content: That poor board. Try to zoom into that damaged area.

author: Cyberdragon
author_rank: Super Contributor
timestamp: December 16, 2017, 02:18:46 am
content: Quote from: james_s on December 16, 2017, 01:35:28 amJust looks like conformal coating to me.

author: stevep3916
author_rank: Newbie
timestamp: December 16, 2017, 02:59:44 am
content: 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

author: joeqsmith
author_rank: Super Contributor
timestamp: December 16, 2017, 03:08:59 am
content: 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