My microwave stopped heating anything up last night and makes a funny noise while it is running. It clearly has power, but just does not heat anything up. What could this be and what would this repair cost approximately? Thanks!

That might be good.

hi,

sounds like the control board. a bad solder. they cost 350.00 so your best bet is to try and disassemble and look for the bad solder joint on the control board, you could possibly take it to your local tv repair shop. here a link to the part. theres two boards one is power supply noise filter and logic. inspect both, make sure you stay clear of the HV red power lines running to capacitor magnetron, use a screwdriver and discharge the capacitor to frame before you start

jm



Sharp R980A R980A CONTROL CPWBFA753WRK0 Microwave Not Heating

Microwave Not Heating

The cause could be a defective magnetron, or inverter board, 7 years or less, or possibily the keypad control.

The loud noise and no heat means that the magnetron has failed. It the part that generates the microwaves that heat the food. When it fails it shorts out, causing the transformer to heat up. That is what was causing the burning smell. The cost of a replacement magnetron is around $130-150 range so it may not make sense to have it fixed.

It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 on high resistance range for short circuit, the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps

We have the same exact microwave & this happened with ours just last night. I'm wondering the same if it is worth having it fixed.

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

78g

don;t worry;
all you need to do is lubricate the fan bearings with light machine oil and make sure the fan is not hitting anything

It sounds like it is the "magnetron" has given up. In any Microwave there is a device called magnetron. This is the device which radiates microwave to heat up anything inside for set time.

Before the device gives up most of the time usually the microwave makes little bit of loud noise. Usually it happens when there is abnormal power.

Remedy: Any qualified technician should be able to replace it. The spare is available from the service centre of the manufacturer. In most cases spare is expensive and it is better off to buy another one.

If the maggie went it's very plasible that it took out the Cap and/or HV diode with it.