truclacicr
Badcaps Veteran
Last Activity: Today, 11:08 AM
Joined: 04-21-2019
Location: brisbane
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Just match the pinout, coil voltage, contact current/voltage ratings. That's usually all you need to do. -
I think this is similar:
https://www.lcsc.com/datasheet/C1527326.pdf
https://www.lcsc.com/search?q=RTB7D012
AFAICT, the "D" in the part number denotes the contact material.Leave a comment:
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Show us the surrounding components.Leave a comment:
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What is the output voltage? If it's 0V, then test for shorts between Vout and Ground.
This version uses an MP2152GQFU:
https://web.archive.org/web/20240909...8/IMGP1855.jpg
https://www.monolithicpower.com/en/d...en/sku/MP2152/
Compare the specs in the datasheets. Pay attention to the feedback voltage and switching frequency.Last edited by truclacicr; 02-10-2026, 02:49 PM.Leave a comment:
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Sorry....Leave a comment:
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https://www.badcaps.net/download/?id=e00b551d
Pin 24 is the output of an internal 5V regulator. I would check for a short to ground at this pin....Leave a comment:
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You did it twice. The first time I dismissed it as a coincidence, and was prepared to accept that you were formulating your reply at the same time as mine. It happens. But your latest edit was posted well and truly after my post was fully established, and it virtually paraphrases my own.Leave a comment:
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Did you even bother to read my reply before parroting it?...Leave a comment:
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U2 is not a buck converter. The nearby coil, L4, is a common mode choke. L4 and C1 filter the 24VDC input.
U1 is a linear regulator that powers the MCU (?) at U4.
What are the markings on U4? Does any pin of U2 connect to U4? Could U2 be a reset monitor/supervisor?Last edited by truclacicr; 02-02-2026, 09:15 PM.Leave a comment:
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I think this circuit makes more sense. Then you could use any jelly-bean NPN BJT.
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Why would you need a base resistor if it's a digital transistor?
Diode D1 is drawn with the wrong polarity.
It can't be an NPN transistor because the MOSFET's gate would always be turned on, irrespective of the output of the op amp. The same would be true for a PNP BJT.Last edited by truclacicr; 01-30-2026, 06:03 PM.Leave a comment:
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Could we see the whole of the underside of the PCB?Leave a comment:
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The copper trace at L1 appears to be corroded.
As for the regulator, the marking is unusual. The date code (?) is usually on the right. I've looked, but I can't find anything.Last edited by truclacicr; 01-29-2026, 04:04 PM.Leave a comment:
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If it's a buck regulator, where is the coil? Which is the feedback pin?Leave a comment:
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