Recent content by iOnico

Some months have gone by since my last post. This post should be (hopefully) the final resume of my repair, as the car is charging again! The news isn’t that new as, after the repair had been done, I have observed the car for quite a while to see if everything works reliably. Having had two...

After some weeks of silence, I’m back for an update. I must admit that I have given up further troubleshooting. The next steps would have needed to find a tool to read the DTCs and very likely to get the power board separated from the waffle plate. Two obstacles that finally seemed too big after...

Ok, forget everything I have written about FB706 before. I don’t know what I did when I measured last time but obviously it was crap. I measured the resistance through FB706 again and the value takes only 2 seconds to settle to a stable value of 741Ω. So, FB706 is another damaged part and very...

No change. voltage on IC840 remains at 0.77V. I then measured resistance at FB706 and FB707 with the 12V being applied to pin 7 and 12 of CN101 (what I shouldn't have done: resistance measures are always to be taken without a voltage applied - end of edit). The meter showed 0.0Ω for FB706 and...

Ok, having the IC512 acting as a zener diode, just like both of you are describing it, makes sense, even if I have to admit that I haven't completely understood how the IC does this. But that's certainly due to not being familiar enough with op-amps and their feedback loops. I'll probably have...

I had a close look at the datasheet of TI’s TL431/TL432 that could be the IC512 on the control board. Taking into account how the board’s leads are connected to the pins of the device, only the pin configuration of the TL431 DBV (SOT-23-5) package seems to fit (page 4 of the datasheet). I then...

During the weekend I did the tests you had suggested, to find out more about the health of the 3 hex inverters ICs and the power supply ICs creating the 5V and 16V power supply. The test based on verifying the (inverting) reaction of the inverter ICs didn’t bring satisfying results. I supplied...

Thanks for your interpretations of my findings. I had another look into the datasheet of 74VHC14FT (the goofy IC705 and IC717) to determine another pin to desolder. The device is described as being a Hex Schmitt Inverter. Besides the VCC and Ground pins there are only 6 logic IN and 6 logic OUT...

OK, I went on with testing the ICs out of the category “others”: After having disconnected all these ICs I’m now reading a resistance of 774 Ω from 5V to Ground and of 674 Ω when switching the leads. The resistance ranking of the ICs so far is (in ascending order): IC503: 20 Ω IC502: 23 Ω...

Wow, that was a quick and very complete answer, Kenny. Thank you. I’d wish I could test and trace as fast as you are providing information to help me! ;) I haven’t come much further, just desoldered 3 other ICs from the 5V supply. The resistance between 5V and Ground changed from 30 Ω to 34 Ω...

If I disconnect the 5V Out of IC707 I should (when measuring resistance of the 5V circuit to Ground) at least be able to observe if this has an influence on the short of the 5V circuit, no? Even if this doesn't tell me the resistance through the device itself. You were mentioning a switched and...

These are the measured resistance values through the ICs (disconnected Vcc pin to Ground): IC503: 20 Ω IC502: 23 Ω IC506: 33 Ω IC518: 52 Ω IC504: 56 Ω I also measured the voltage drop with the diode check function (5V-Ground): 0.02 V On my board it makes no difference when I’m switching the...

I was a bit short on time to proceed with testing these last days, but now I’ve been able to realise the next steps. I’ve used the needle-toothpick leverage method you had suggested. Thanks for the detailed description. It worked well. I had started with the IC that warmed up the most (IC502)...

My car model has this little box on the OBC with a fuse and the EMI filter inductor inside of it. So, that should explain the "missing" parts on my control board. After having inspected the board with some voltage applied and a thermometer, I would now say that the short is not coming from the...

Thanks to both of you for your helpful advice for the next steps. I’ll try to find a non-contact thermometer somewhere and then search for the place with significant heat dissipation with 2-3 V being supplied to the 5 V circuit. If it’s finally a short in layers at one of the VIAs having been...