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by skylogger
Mon Sep 24, 2018 10:54 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 413
Views: 72714

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

ChristoferFR: It's a good thing Coulomb pointed out that you have the battery polarity wrong. Connecting it the way you show, will blow the diode, and that particular diode is a bit hard to identify. I think we might suggest putting a resistor in series with the battery in future documentation on th...
by skylogger
Sun Sep 23, 2018 2:56 am
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 413
Views: 72714

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

Electronpusher: Probably the reason you are having difficulty with desoldering the riser PCB is that you have to remove solder in 8 places, not just 4. Out of each of the 4 holes coming out of the main PCB, there are 8 pins, 2 pins come out of each hole. One pin solders on top side of riser PCB and ...
by skylogger
Sat Sep 22, 2018 10:12 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 413
Views: 72714

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

Hi Electronpusher: From the photo you just posted, it looks like you have all the screws removed, but have not unscrewed/removed the four hex standoffs. Even though it looks like the standoffs do not make contact to the PCB, They actually mount the heat sink to the box below, and since the PCB is st...
by skylogger
Wed Sep 19, 2018 8:04 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 413
Views: 72714

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

Quix: It sounds like the dealar has changed out the fuse but it may have blown again since they did not fix what causes the fuse to blow. You cannot just look at the fuse to see if it's blown, because the fuse is filled with sand. You have to use an ohm meter and check for close to zero ohms for a g...
by skylogger
Wed Sep 19, 2018 3:20 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 413
Views: 72714

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

Electronpusher: When I ran into problems getting the original 20 amp fuse, I bought the 10x38 fuse type that you showed in your last post. To be able to use it, I also bought a DIN fuse holder, and ran wires from the fuse holder with small ring terminals that would screw down to the original two scr...
by skylogger
Mon Sep 17, 2018 3:54 am
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 413
Views: 72714

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

Footswitch: When I cut one of the CANBUS lines, I was busy checking that the LED that I added to confirm that the doghouse relay was closing (which it did not do) so I was standing at the back of the car. I was able to hear the contactors and fan go on, so I knew that AC input was detected, but sill...
by skylogger
Thu Sep 13, 2018 9:05 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 413
Views: 72714

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

On the second OBC that I just finished working on, I've been told that the charging failed during a night that there was a storm and heavy rain. This could point towards a blackout, brownout, or power surge as the source of the falult. The 12v AUX battery had been replaced 2 years ago by RAC. When I...
by skylogger
Thu Sep 13, 2018 3:02 pm
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 413
Views: 72714

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

One really annoying thing that I have is the fact that so far, we can't get a OBC to actually run on the bench, without being re-fitted in the car. I've supplied the two 12v supplies to the top pcb, and 240vac to the input of the OBC, but the OBC sits there doing nothing. In particular, I see that t...
by skylogger
Thu Sep 13, 2018 2:12 am
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 413
Views: 72714

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

Hi KIEV / Coulomb and other distinguished quest: It looks like I've been able to successfully repair this second OBC that I have been working on. So the list of TRUE faulty parts were the 20 AMP fuse in the MCU, The two 1000pf snubber caps in the doghouse, The Relay, and one of the 4.7R resistors in...
by skylogger
Tue Sep 11, 2018 2:04 am
Forum: Batteries and Battery Management
Topic: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter
Replies: 413
Views: 72714

Re: Troubleshooting and repair for On-board Charger (OBC), DC-DC Converter

Hi Coloumb / KIEV: I mentioned earlier that during the testing of the relay in the doghouse, that I accidentally blew up the protection diode on it's coil by putting wrong polarity during the test. I found a simular diode in a piece of scrapped equipment and replaced it with that while waiting on th...

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