Question about Sharp R-1850A Convection/Microwave Oven

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Loud popping noise after being plugged into 50 amp power source possible power surge unit in rv unit light still works but no power to make unit work.

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What happens a lot in these RV microwaves is that a surge will damage the circuit board and sometimes also blow the low voltage transformer.

These are problems we can usually take care of for $39.95 and $54.95 respectively.

You can get more information here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on May 26, 2011

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Frigidaire cfmv152clba


Good Afternoon Friend,

I understand that you had a power surge in your RV and your Frigidaire microwave, model# CFMV152CLBA, does not have any power to it. I also see that the outlet your appliance is plugged into has power. I suggest contacting your local authorized technician, mainly because you are dealing with your microwave. The technician will be able to diagnose your appliance and determine why it is not responsive. Hope this is helpful.

-Best Regards-
WP

Jun 17, 2014 | Frigidaire Microwave Ovens

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Sharp Carousel Microwave Mdl 1875 for our RV is dead


>> We also tried plugging our toaster into the microwave plug outlet, and the toaster wouldn't work in that outlet, but worked just fine in a different outlet in the RV.

This means the outlet you plug your microwave into needs to be fixed in addition to fixing the oven. Breaker? Fuse?

>> I understand from another RV forum that microwave ovens for RVs have "special circuitry and cooling features" not found in regular countertop ovens for household use.

Not really in my experience. Any microwave supplied with clean AC power and proper venting space will be fine.

But I'd bet your microwave can be fixed affordably.

The main internal things which can result in this model being dead (no display, no light when you open the door, no beep when you press a pad on the keypad) would be the 20A fuse and the magnetron temperature fuse. There could also be bad connections on the noise filter board.

Also, sometimes a power surge can cause the power to be interrupted to the low voltage transformer on the board, and I regularly repair those boards. I can also write a technical statement to your insurance company or to an RV park as needed.

At my Web site, I have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

The relevant service manuals for this model are here and here.

You can order Sharp parts from Sears or Encompass.

Contact me directly if you need more help.

- William E. Miller, AS-EET
pupista@gmail.com
http://www.MicrowaveControl.com
Microwave Oven Control Panel Repair Nationwide "Recycling by repairing since 1982"

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Unless a expensive unit I would replace it as the main power supply for the unit a who knows what else got toasted---

Aug 27, 2012 | Microwave Ovens

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Westinghouse wmg281sf microwave Microwave (mw) less than 6 months old and after selecting start the mw makes a noise that seems to come from the light and during operation impedes the power source to the...


Hello mbz... Since the operation is impeded, the problem is more than the light bulb. This unit has an internal short, and should be under warranty for the first year. Return it. Joe

Thanks for choosing Fixya!

Dec 16, 2010 | Westinghouse Microwave Ovens

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Our sylvania microwave model sr11092b received a power surge that blew the internal fuse and would not run (it also fried the power converter in my rv)\r\nReplaced power converter, replaced internal fuse...


I had the EXACT same symptoms with my Sylvania SR1109sb after a power surge.
After some digging around I thought what the heck let me try holding down the Reset button and do a power off/on cycle and what do you know it worked !!!
Just pressing the Reset did nothing until the cycle off and on.
Ron W.

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HI, the sound you herd was the noise filter and running diode. these important components have failed at this point. you will need to replace these components asap, if possible. this will fix your issue.

The Magnetron Cut-off fuse will need to be replace as well. this will blow if there is a malfunction within the unit.

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Is it safe to use your microwave if it pops like this all the time randomly... And sometimes lights up in the back like a spark or something???

Nov 19, 2008 | Microwave Ovens

1 Answer

No power


It may be the fuse, which is usually located behind the grille or on the floor of the oven behind the control panel, between the door switches, or inside near where the cord goes into the chassis.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

Or another common problem, is surge damage on the control circuit board. We regularly repair these control units for customers nationwide with our guaranteed $39.95 service.

Feel free to contact me directly for more information & help.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

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1 Answer

Microwave made loud popping noise


The magnetron is bad. Probably cost about $50 or $60 for the part. Not too easy to replace, but it can be done.

Dec 13, 2007 | Whirlpool MH7130XE Microwave Oven

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