Question about Sharp R-1481B Microwave Oven

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Hood lights do not turn off...

Here are the details. I think it's the control board or a switch. but I just want to confirm before I order the part.

I replaced the bulbs in the hood with bulbs in spec according to the manual.

After replacing the bulbs everything worked normally.

The next morning I could not turn the hood lights off.

Pressing the "work light" and "night light" switches got me beeping sounds but no on/off.

Unscrewing one bulb an alternating which one is unscrewed does not change result.

Everything else on the unit functions normally including the rest of the control board.

Any ideas? Part numbers from partstore.com are helpful as well.

Thanks so much!

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  • 9,098 Answers

The problem is on the control panel, which we regularly repair nationwide for $39.95 postpaid.

This is far less than a replacement circuit board, assuming it's even available anymore.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

This often can affect the exhaust fan operation, too. The lights and fan can be inoperable or stuck on.

We have full details and critical safety information and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk

Posted on Nov 17, 2007

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Ge lvm1750dm1ww microwave


<-- I see and repair this problem on a regular basis. Details are here.

This failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line, as the warning label near the light socket advises.

This causes a failure on the control circuit board.

The lights can can be inoperable, or stuck on, or stuck in "night light" mode. Sometimes this will similarly affect the fan operation or inside light, too.

You can get it your smart board repaired or order a replacement part number WB27X10935 here.

Whether you choose repair or replacement, the first step is to remove the controller assembly.

Here
is a video showing how to remove a typical over the range control panel assembly in under 5 minutes.

Next, disconnect the strip as shown in the photo below, then remove the screws that hold your circuit board in the old frame.

keypad_connector.jpg

Some connectors may have a lock. positivelock.jpg

Then carefully (since the display is made of glass) move your circuit board to the new frame, and reassembly is the reverse of disassembly.

If you choose repair, do not disconnect the keypad connector and do not remove the board screws. Leave the controller assembly intact.

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Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean, solder and reset the board. Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron. Check this link to know how a microwave works:

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That's probably a failed door switch or door switch mount.

It's a pretty simple do it yourself fix. See this helpful file on door switches.

You can find handy exploded views and order parts by model number here.

But if your cooktop lights failed recently, you have a damaged control circuit board, which we can usually repair for $39.95. Details are here.

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We replaced the light in the hood (over the stove) and there was a spark and now neither the hood nor the microwave works. We reset the circuit breaker but it did not fix the problem. Do we need a buy a...


We see (and repair) this a lot. The problem is on the control panel, which we regularly repair nationwide by mail for $39.95 postpaid with a one year guarantee.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

This can often also affect the exhaust fan, cooling fan, turntable, and/or inside light operation, too.

Details of our service are at our Web site, along with a video showing how to remove a typical over the range control panel assembly in under 5 minutes.

If you prefer, you can order a new control circuit board and install it.

You can find helpful exploded view diagrams and order parts by entering your full model number here.

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

Then you unplug the keypad (as per the photo below), remove the damaged circuit board and insert the new one.

34374fd.jpg

Some connectors on the relays have a lock:

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

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This is caused by either a shorted hood thermal cutout / hood thermostat, or your control circuit board may need repair.

You should first check your hood thermostat to be sure it measures open (infinite) and not shorted (near zero).

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

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

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

If it reads good, then your board will need to be repaired or replaced. You can order one here.

But we see (and repair) this board failure a lot, and we regularly repair them nationwide by mail for only $39.95 postpaid in most cases.

This failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

The lights can can be inoperable or stuck on or stuck in "night light" mode. Sometimes this will similarly affect the fan operation or inside light, too.

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

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