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  1. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    The replacement TVS diode arrived today and I soldered it on. The short circuit observed before is gone. I plugged it into my truck and the GAUGE fuse didn't blow and now I have A/C again. I fixed the issue finally. Thank you @george_tlc for your help in identifying the part. It was the correct...
  2. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    That's the plan. Thanks for your help. It is too bad that we can't just have that information. What is it worth to anybody locked away somewhere?
  3. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    I do think the "27 620" markings on the TVS diode means 27V avalanche, 620W. Doing the math, this part would burn out if it had to shunt more than 24A at 27V. That's three times the capacity of the 7.5 Amp GAUGE fuse that protects the circuit. I wonder if that also means if the Amps stay under...
  4. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    I wish there was a way to get the Denso schematics and BOM so that we'd be able to repair all of these computers much easier.
  5. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    Of course it is way over priced. But I'm trading money for time. The electronics parts suppliers couldn't have it to me until late next week.
  6. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    Ordered it. Thanks for your help. I still have the replacement unit coming from cruiserparts but if I can fix this one too, I'll have a backup.
  7. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    So something like this? Sorry, I guess we can't post amazon links in here. Search amazon for: "NTE Electronics NTE4934 Transient Overvoltage Suppressor Unidirectional Diode, Surge Clamping, Axial Lead, 1500W, 27.05V Breakdown Voltage"
  8. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    I just looked up MOV varistor and those look like ceramic capacitors. TVS diodes look like this part.
  9. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    I hope you're right. Given the markings, will you help me find a replacement part? It sounds like the zener diode symbol on the board sent me in the wrong direction.
  10. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    It can't be 6.2V zener voltage. The input to the cathode on this part is straight from the GAUGE fuse, so 12-14V. If the zener voltage is 27V then it wouldn't ever kick in as a voltage regulator. I have no clue what the specs are on this part. The only way to really know is for somebody with a...
  11. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    Based on the markings on the circuit board and the fact that the cathode is connected to hot, I'm 99% sure that this is a zener diode used to provide a reference voltage for this part of the circuit. The next question is, based on the markings on the diode, what are its specifications so that...
  12. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    So to be clear, the failed part is a diode which regulates power and is also a common point of failure in electronics. If you ever have a spinning hard disk die because the platters fail to spin up, a quick trick is to find the power diode and desolder it to remove the short circuit. The drive...
  13. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    Here's the photo from before desoldering the capacitor and the diode.I'm testing the same points on the board as I did in the "after" shot above. I just wanted to show that there was a short before desoldering and then there isn't one after desoldering the capacitor and diode.
  14. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    aaaaand, of course just after a I order the new part and spend the hefty amount of money, I followed the hot traces to the second board and found a hefty diode that was next in the circuit. I desoldered it and sure enough it was actually the short: It's hard to take pictures and test parts at...
  15. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    Well, s***. Now that the sun is up and nap time is over, I decided to dive in deeper. One thing I forgot to mention last night is that there is no guarantee that the first filtering cap is the short. I got ahead of myself late last night. In theory, anything on this board could be shorting, its...
  16. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    That sound super frustrating. Dang.
  17. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    But it turns out there is a hidden and undocumented splice that changes this: J4, 10 - C16, 4 cooling fan, also A/C Air Amplifier and two other places I haven't followed the wires to yet.
  18. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    Oh, you're right, it is pin 10. I just took a closer look at the note on page 5 of the EWD. I was looking at the arrows and not the numbers in the note :cheers: So it is pin 10. It really doesn't matter though because the junctions label all pins as "A" or "B" and so knowing the pin number...
  19. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    If any of you guys are ever in Vegas, you should stop by the Las Vegas hacker space called The Syn Shop. I learned this electronics theory from playing around with circuits on nights where everybody solders up some electronics kits.
  20. vegas

    Let's all learn how to debug a GAUGE fuse blown due to a short circuit

    The proper fix of course is to replace the capacitor with a new one with the same capacitance and voltage tolerances. Here's a closeup of the markings on the capacitor: So this is a 47 uF 35V tolerant electrolytic capacitor. It's likely an aluminum one but the inner material doesn't really...
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