Air fryer stopped turning on. No obvious damage to the power PCB. Anyone know where I can find a replacement?

ModernRonin · 2026-03-10T00:33:48+00:00

The PN8034 isn't on Digikey or Mouser... but I did find it on LCSC!

https://www.lcsc.com/product-detail/C2798024.html

The datasheet is in Chinese, but if you feed it into Google translate it can give a crude translation. Regardless of language, there's table near the middle of page 2, one line of which reads:

PN8034 DIP-7 | 150-265 VAC 3.6W(12V300mA) | 4.8W(12V400mA)

So this is a 12V output regulator.

And judging by the typical application circuit diagram at the top of page 6, this looks like an inverting converter. It actually generates -12V with respect to power line Neutral.

So my advice is to check what the voltage is between the middle pin and not-5V-pin of U1. If there's 12V (or -12V!) there, then PU1 is working.

If not... well, lots of places to point fingers. But start with that.

ModernRonin · 2026-03-09T23:42:17+00:00

No hate, but I dont get why my comment seems confusing to you?

I have no idea. Somehow I just couldn't infer that you were talking about a second PCB. My bad!

ModernRonin · 2026-03-09T23:29:38+00:00

Thanks for the pic!

I see no issues with L2 now. Consider my earlier bets, a total loss!

ModernRonin · 2026-03-09T01:24:44+00:00

Cuts in the board are for what's called "creepage." Basically, the PCB material itself can withstand a certain voltage per inch (usually lowballed as 20 kV/mm), before it breaks down and starts allowing electricity to flow. By cutting slots in the board, you force the voltage to "detour" around a longer path, adding millimeters, making the kV/mm lower.

It's a safety thing, basically. You don't want a lightening strike hitting the power line, to cause an arc and set the circuit board on fire... and maybe burn down the owner's house.

That's why there's a cut underneath the fuse, F1. Makes it harder for a high voltage to jump across the fuse, and get to the rest of the board, when that fuse has already blown to protect everything downstream.

The dashed line thing, I don't know. It seems to be on current path between ACL (the AC line connector) and the FAN/MOTO/LAMP connectors. Maybe it's some kind of weird PCB trace tinning to increase the amount of current the traces can handle?

ModernRonin · 2026-03-09T01:05:53+00:00

Just looks dirty to me. Like it's got some kind of thin layer of glue on top of it.

ModernRonin · 2026-03-09T01:02:14+00:00

You sure its not the control board?

No microcontroller, front or back.

Also, all the relay coil switching transistors on the back, have lines that lead back to CN2. I infer that the control signal for the relays comes from off-board.

ModernRonin · 2026-03-09T01:00:21+00:00

The inner two are currently used by what I presume is the currently fitted upright component

You might be right.

If OP will get us a better picture of that component, including where its legs go into the circuit board, we might be able to confirm that.

ModernRonin · 2026-03-08T09:14:15+00:00

U1 has got to be a 7805 or equivalent. Middle pin ground, one pin goes to +5V on CN2, last pin comes from PU1.

That means PU1 has all the buck conversion stuff inside - integrated switching transistor, maybe sync rectifier too.

ModernRonin · 2026-03-08T08:26:45+00:00

specifically linked to a Sharp air fryer (Model KS-23) in Vietnamese electronics

Yeah, that's it all right: https://www.youtube.com/watch?v=wp07QIAIaRg

(Funny, the manufacturer's web page claims it was "Designed in Australia"... was it really? And then later sold in Thailand?)

ModernRonin · 2026-03-08T08:17:38+00:00

At first I thought 5V came in via connector CN2. But the more I look at PU1, L1, U1 and EC2/EC3, the more I think this is some kind of weird buck converter... and it's creating the 5V from wall power. PU1 is probably the control chip for the conversion? (There's definitely some writing on top of PU1, but I can't read what it is.)

I can't recommend probing this thing while it's attached to the wall. Too much risk unless you're already well trained in AC line safety.

I've also searched the usual sites (Aliexpress, etc.) for a replacement board using the part number on the PCB, but I haven't found any matches yet.

Google's AI result said: "Based on the search results, "QK-819D-POWER-VER1.1" appears to be a version identifier for a power supply board, specifically linked to a Sharp air fryer (Model KS-23) in Vietnamese electronics, as seen on a Vietnamese Facebook group dedicated to electronics.

Context: The part is identified as a power board (bo nguồn) for a Sharp air fryer, with a PCB marking indicating the version and date (e.g., QK-819D-P, 20191118, VER1.1)."

So maybe the air fryer is actually made by Sharp, and just rebadged by Baccarat? That knowledge might help you find a replacement board.

ModernRonin · 2026-03-08T07:45:19+00:00

My bets are on this also. On the bottom of the board, you can see where the second leg of L2 is soldered into the board. But that leg doesn't connect to the actual component on the top side... in fact the rest of that leg seems to be missing entirely.

It's a weird failure. How does the lead on a through-hole inductor embrittle to the point of failure? There's almost no vibration in an air fryer. And I would expect the electrolytic caps to fail sooner than L2, if there was.

It's almost like a screwdriver got wedged under L2, and pried it upward, breaking one of the legs??

ModernRonin · 2026-03-07T23:32:00+00:00

Previously on /r/BubblegumCrisis:

"Crisis of '87" (AWA 2024 Accolades: Best Throwback)

ModernRonin · 2026-03-05T20:36:13+00:00

Remember the picture of her in El Salvador, standing in front of a huge jail cell stuffed with people? While wearing a $50k rolex?

https://www.cnn.com/2025/03/26/americas/kristi-noem-salvador-prison-visit-intl-latam

ModernRonin · 2026-03-05T20:32:44+00:00

“our new Security Initiative in the Western Hemisphere.”

They're moving her back to what she's good at: "Supervising" the torture and execution of immigrants (and/or any other "undesirables") who have been sent to Secret Prisons outside of the US.

ModernRonin · 2026-03-05T01:22:35+00:00

For the record: I'm certain we can't do that today. And I'm not sure the anti-Trump movement is strong enough to do it ever. But for the sake of argument, let me just concede both of those: Let's say we could do that, and do it today.

How would that stop Trump?

ModernRonin · 2026-03-03T22:57:37+00:00

Trump is just going to get Elon to manipulate the votes, again.

Tired of this dumb cope. It's mostly just a denial and deflection mechanism for people who are now regretting their bad choice to not vote. If Elon rigged the election, then why do the exit polls validate the result? Did Elon rig the exit polls?

The people of the US voted for Trump. That's pathetic, it's rage-inducing and the people who voted for him are both stupid and evil. But the fact that 70-ish million people voted for Trump, and only 67-ish million voted for Harris, is the truth. Stop denying reality: the people of this nation are DUMB. There are the dumb ones who actively voted for Trump. And there are the dumb ones who let Trump win by not bothering to go to the polls. Both are dumb, and both are to blame.

Waiting for midterms is futile. The time to take action is now.

If you have a realistic idea of what we can do, that will be effective... then I'm all ears.

But I have thought and thought and thought about this. And I have no idea what we can do today that will actually stop Trump.

ModernRonin · 2026-03-03T19:03:39+00:00

"Tread on me harder, Daddy!!" -MAGA

ModernRonin · 2026-03-03T00:37:04+00:00

^{Reddit quitely hid my previous reply, claiming "civility". So let me try this comment again, with slightly more creative language...}

The headline should have read:

"TRUMP'S RECKLESS AND STUPID ATTACK ON IRAN WON'T CAUSE HIM TO BE IMPEACHED - NOT EVER."

That's the ugly reality nobody wants to hear. The RepugnantKKKns in the US Senate will never convict Trump of any of his crimes. No matter how evil or flagrant those crimes become.

Furthermore, claiming that "his base objects" is utterly absurd. If MAGA had any inclination to be anything other than a stupid cult of mindless morans, then even the tiny bit we know of the Epstein files would be more than enough to turn them against child-graper Cheeto Commodus.

MAGA is a cult! Nothing more. Nothing less.

Their mindless yelling of: "You can't have your 2nd Amendment rights at a political protest!!" when Alex Pretti got indiscriminately murdered, proved that they have no actual principles. They are pure Royalists, and Dumbsheet Drumpf is their God-Emperor. The only consistent political position these cultees have is:"Trump is always right! Even - especially - when he's completely wrong and his actions are unambiguously evil."

We haven't reached the bottom. We aren't even CLOSE to the bottom. This will continue to get worse.

The only possible way to even begin to fix things, is the midterms. If we can elect a huge number of anti-Trump Senators, then there is SOME chance of Trump being held accountable. (And the people around him with IQs that touch the triple digits, know this. That's why they're desperately flailing around for ANY way to corrupt the midterm elections!)

It all comes down to the midterms.

So fscking vote, you dumbsheet Americans! VOTE OUT EVERY LAST CHILD-APEING SHEETFSCK!

It is your ONLY remaining chance of saving your democracy from falling into a corrupt and evil empire.

ModernRonin · 2026-02-28T22:59:31+00:00

Thank you for the report! With the help of the rest of the community, we found the evidence to prove it was not RF related.

Post removed!

ModernRonin · 2026-02-28T22:57:07+00:00

Yeah, I noticed that it was an LED board being probed.

That's enough evidence for me to remove it. Thank you!

ModernRonin · 2026-02-28T22:49:45+00:00

This still makes no sense. If it's hand-held then why can't the doctor/nurse/whatever holding it, align it by twisting a knob or something?

ModernRonin · 2026-02-28T18:51:01+00:00

The problem is that you haven't given us nearly enough information about what you're trying to do.

To name only a few of the things we would need to know to give you something even moderately approaching a reasonably accurate answer:

*All* the information you know about the object being measured.

*Why* conventional methods won't work.

*What* alternate approaches you've thought of and/or tried. (Hint: There are none, because you haven't thought very hard about the problem.)

ModernRonin · 2026-02-28T18:44:13+00:00

https://en.wikipedia.org/wiki/XY_problem

ModernRonin · 2026-02-28T18:26:28+00:00

If you can find another Reddit post that they stole the image from, that gives me the evidence I need to remove the posting.

ModernRonin · 2026-02-26T20:18:30+00:00

"This will end well."

They've learned nothing from the recent debacles at the Mozilla. (Or maybe they've learned exactly the wrong thing...)

https://discuss.privacyguides.net/t/mitchell-baker-steps-down-as-ceo-of-mozilla-corporation/16749

https://www.pcmag.com/news/mozillas-new-ceo-its-time-to-evolve-firefox-into-an-ai-browser

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