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These are labels on the printed circuit board near the pads that connect to the Waffle Plate™.

My guess is that the relay isn't being told to turn on, e.g. there is some sort of problem with the relay driver transistor or circuit leading up to it. So then when the charger starts to draw significant current, the 4.7 Ω resistor is severely overloaded and fails open circuit. Or blows its...

Google translation (two posts): In addition to the [ waffle ] plate, several capacitors that were on another board failed. They were replaced with [ similar ] ones. We don't have a car dump. And spare parts are sold only at disassembly. And some sellers inflate the price of the goods. Another...

Could be. But the BMU firmware seems to be encrypted; only the CMU firmware seems to be unencrypted. I had pretty much given up on making sense of the CMU code, and have not even been able to start on the BMU, because of the encryption. But Kolyandex seems to have a way of getting to the...

Yes, you need that. On one of the forums that I moderate, we have a canned response for disallowing the first post, something on the order of "We require a more substantial first post for spam control". I'm guessing it adds one more item to the list of things to do when updating the forum...

Do you mean one new cell, or a complete replacement high voltage battery? I assume you mean one cell. That photo with the 0.45 V cell tells a story. You will have to balance the cells carefully before re-assembly. I'm surprised that you are able to get the contactors to come on at all, with...

I had to look it up too. You are correct: https://en.wikipedia.org/wiki/Arc-fault_circuit_interrupter It looks like it's mainly a North American thing, with their low utility voltage for most outlets.

Ah. That means that a pair of diodes would be placed across each of the two transformers' outputs. It's hard to say what this would have done; it certainly will have stressed the diodes, and possibly also the IGBTs driving the tranformers. Find pairs where there are single diodes between them...

Just because it's new doesn't mean it hasn't been ruined, unfortunately. Give it a really good charge first; 12.5 V under charge is not even close to a full charge. It might take over a day, depending on the size of your battery and the current rating of the charger. It may come good. If not...

It's a matter of testing the components that drive the gate. Usually, that's resistors, diodes, driver transistors, and chips. The resistors can often be measured directly with a multimeter, but it helps if you understand how circuits work so that you won't be surprised when other circuit...

Yes.

I think it might be worth hand balancing those two cells. But the question would be at what SoC? Perhaps 50% display [ edit: was real ] SoC would be best, for minimum difference at the top and at the bottom, both of which can reduce range. Edit: I changed my mind to 50% "display" SoC, since...

My guess is that when the original transistors blew, they took out some of the gate driver components. It's not clear to me exactly where this tiny spark was, but it's near a gate (left) lead. Perhaps it was a gate component arcing internally. It can be frustrating repairing this sort of fault...

It doesn't count for high voltage, high current DC wiring; that's a little different, and the danger level is quite high. I don't want to totally discourage you, but please post any plans here before attempting anything. We don't want another "Plasma Boy" (the White Zombie owner, not the Disney...

https://www.infineon.com/cms/en/product/search/cross-reference/#!view=crossReference&term=STW27NM60ND The manufacturer usually likes to be helpful in cases like this.

I don't think anyone knows what part number they are. IK think it's generally accepted that you can't really fix anything major on the Waffle Plate™, though I know someone did replace a capacitor or two on one. How do you plan on getting through the black potting material? Do you know that the...

They actually will get up to ≈170 V briefly, so a massive overload: P = U²/R = 170²/4.7 = 7225 W, or a 723x overload! I suppose one should use RMS values, so that's 120²/4.7 = 3064 W = 306x overload. I would prefer to see a resistor with a high peak power rating, usually these are aluminium clad...

The fuse in the resistor is a thermal fuse. Obviously, it needs to be in thermal contact with the resistor element. I don't think that your fuse will protect much, but it should not do any harm. Fortunately, it should only be blocking AC; you'd have yourself an arc lamp if it was blocking pack...

I had a quick skim. It's a 16-bit CPU with 16 KiB of (mask programmable?) prom, A and B accumulators (16 bits), X and Y index registers (both 16-bit), and 16-bit S and PC registers. It sounds like a Motorola 6809, though quite possibly not instruction set compatible. [ Edit: definitely not...

I would guess so. Contact cleaner is a solvent, as far as I know.