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Similarly to what Weber has just posted: Have you checked the IGBT gate drivers? Often when an IGBT or MOSFET fails, the gate shorts to other terminals, and can blow up resistors and transistors in the gate driver circuit.
I don't think your eyes are the problem. There is no marking. They are 2.7 nF (2n7). I had to cut a track to measure that.Cactus wrote: ↑Fri, 30 Aug 2019, 16:06Hi all,
I was hoping someone would be able to provide me with the value of capacitors C152 - C162 in a PIP-4048MS (C152 in Coulombs partial schematic on page 71 of this thread dated Thu, 13 Jul 2017, 21:17) as I managed to damage one of mine while cleaning the pcb during repairs and my old eyes don't help me to see any markings on any of them.
Many thanks for any assistance.
It sounds like the main power supply is failing after a fraction of a second. This power supply powers the processor, LC Display and its backlight, and all the control electronics. It could be a fault in the power supply, or something might be loading the power supply excessively. Since from your description the pattern seems to be regular, I'd guess the second case: power is good for several hundred milliseconds until the firmware turns on hardware component X, component X is faulty and causes the main power supply voltage to collapse, the processor resets, component X is turned off by the power going off, that allows the power supply voltage to come up again and the cycle repeats.
Something that I should have thought of yesterday, but only occurred to me as I watched your video, is that perhaps the battery (or one cell of the battery) has collapsed. Can you check the battery voltage, first with no load, then when you connect it to the inverter? You might need to use the "min and max" feature of your multimeter, if it has one, or use the "analogue" bar-graph feature, if it has one, to see the rapid dips in voltage that, if present, would cause this behaviour.
R250 is 30 kilohms.
2SA1020 how did you test it and where on the board are the Q14, Q15, Q16, Q41 in the IGBT and the Mosfet Q46, Q47, Q48, Q49
I would think that when one of a set of 4 gate driver transistors blows up, it's quite random as to which one will blow (depends on the phase of the output at the time, for instance). So I don't think you'll profit from knowing which one it was for someone else's specific case. You just have to test each one; this can usually be done in-circuit, with reference to the schematic traces.
which are the gate drivers. On the board are more than just a PNP. Which of the 2SA1020 come into question.coulomb wrote: ↑Sat, 21 Sep 2019, 07:52I would think that when one of a set of 4 gate driver transistors blows up, it's quite random as to which one will blow (depends on the phase of the output at the time, for instance). So I don't think you'll profit from knowing which one it was for someone else's specific case. You just have to test each one; this can usually be done in-circuit, with reference to the schematic traces.
Hi RevlacRevlac wrote: ↑Sat, 21 Sep 2019, 17:28Hi Luke, Nice work getting it running again.
I Have repaired an 09 fault and many of those associated parts, very time consuming finding the faulty parts, Also check DC/DC driver Diodes, ZD24 ZD25 ZD29 ZD26 ZD31 ZD28 ZD30 ZD28, found 2 of them open circuit.
17 months since I repaired it, give it some hard work in the shed running power tools, and its still running well.