kiev wrote:Those are some great pictures, i was able to zoom in to inspect the usual culprits. All i could find was the 2 cracked snubber capacitors (little blue buttons). This is the common part to fail and can be repaired.
There are details from other folks that have done this in the troubleshooting thread, but it basically involves scraping out the black rubbery material from around those capacitors, then cutting them out above the board leaving as much of the lead wire sticking up as possible (crack the cover to reveal a bit more of the wire); then carefully bend the leads of the new caps without cracking the ceramic blend radius such that it can be soldered to the stub.
Take a look at the picture and discussion from Simon on page 45 and 44:
He found a good source for these and provides a link to order them.
If you have a voltmeter with a diode check function, then you can remove the faston tabs and check for a short in the high power semiconductors underneath the board, there is a schematic for this on the same page link above.
Good Luck to you and stay safe.
kiev wrote:Yes that is the MCU fuse that is blown when the blue snubber caps are found cracked or exploded. It should read a direct short when measuring across a good fuse, and it will be infinite resistance when blown. They can be purchased thru a dealer parts department, or an equivalent can be ordered from online electrical parts vendors such as Mouser, digikey, RS Electronics, etc.
Go take a look at the first 2 posts on page 1 of the Troubleshooting thread for links and details about the fuse and many other aspects of the OBC. Or do a search on this website for "MCU fuse" to find discusssion and details.
Where are you located?
kiev wrote:i'm sorry if it wasn't clear, but both snubber capacitors should be changed, even if only one appears bad. They are a pair in parallel in the circuit, if one blew then the other is likely bad also (short circuit) even if it didn't crack. At the very least it should be measured and checked to verify it's good, but the risk is not worth the cost savings of only replacing one.
In addition, before doing the capacitor change it would be worthwhile to check all the diode drops of the semiconductors in the black "waffle plate" soldered under the board. If something is shorted in the plate, then it can't be repaired and no need to replace the snubbers.