Question about Bosch HME9760 Microwave Oven

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HME 9750GB /03

There was a loud bang when the dor was opened. The power failed but the 13 amp fuse was intact. The only thing that was obvious was the 40 watt bulb had blown. This I replaced but still the power was not there. I removed the back to see if there was anything obviously wrong. Everything looked pristine. I coud not find an internal fuse or trip and I did not have a wiring drawing refer to. Power is on to the unit but the displays are not lit and the new bulb does not light when the door is opened.

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  • Guy75 Nov 30, 2007

    Where can I obtain a wiring diagram?



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

please see this LINK first

Posted on Nov 30, 2007


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I think your prob is not simple if anybody tell u do this or tat don't do it because i have a same prob but my fault is try myself and it becomes more disable and father beaten me
so acc to my opinion go to the expert and where u buy this he normaled your problem don't worry i do the same thing
and u again enjoy
[email protected]

Posted on Nov 30, 2007


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Magic chef microwave just stopped heating, can you tell where the fuse is so i can check it, and i am open for any suggestions. model # hdm111ow

Sounds like the magnetron has failed, if it were the power supply or capacitor or fuse, it would have failed to heat straight away, not faded out. Probably more economic to replace the machine.

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Whirlpool Talent Microwave The microwave starts off ok, then during cooking its still turning & the light is on but its not cooking. It can go on like this for 8 or 9 minutes and then you hear a small...

That is the magnetron faulty. The oven stops cooking, as the magnetron lose contact, when the magnetron restart working you hear that loud bang, and it restart radiating.

Replace the magnetron.

You find parts here or here.

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Sounds like an electrolytic blew, but it could be any nuber i=of things. Usually when one element fails, others are damaged and are failing as well, such as the magnetron.
If it is an inexpensive table-top microwave, it would be less expensive to replace it with a new one.

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Sharp carousal convection smart+easy does it have a fuse just died

First check is the main fuse of the unit. On countertop units, you will need to take the shell off. The fuse will be close to where the cord comes through into the unit. OTR units, this main fuse is usually behind the control panel or possibly behind the vent. Usually the fuse is obvious if blown, otherwise test with an OHM meter, if open, replace fuse.
Some brands will also have a thermal cut-off fuse in the incoming voltage line to the control board. Older Maytags and Samsungs have this fuse in it. This thermostat looking fuse is usually above the oven cavity somewhere under the outside shell. Sometimes you can get to it through the vent of OTR models. Test with an OHM meter, replace if open.
use the VOM, God bless you


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I own a GMV1540TB and while using the unit it stopped working, no lites. no nothing. The unit made a sound like a breaker went. Checked my panel it was okay, tried other outlets nothing came on/. Is...

Hi and welcome to FixYa, I am Kelly.

When a microwave suddenly quits and causes the internal FUSE to open it is usually either the high voltage power diode or the high voltage capacitor that has failed causing the fuse to fail. After searching for your model number it appears that this is a Canadian model. LG does not have many parts for this unit listed on their website at all. All but 2 of the items the sell are "out of stock." Neither the diode or the capacitor are are listed. These parts can be replaced with GENERIC equivalent parts.

  • First off unplug the unit.
  • Remove the outer chassis cover ( 6 screws in the back and 4 on the sides )
  • Hold a screwdriver way back on the handle and short across the high voltage capacitor at least 3 times (Will really ruin your day if it is good and still has a charge!) This may make a huge BANG / Blue Spark. Not to worry it is normal and your using the screwdriver to discharge the capacitor.
  • Note installed wire positions (make a sketch) and remove all the wires off one side of the capacitor.
  • Use a meter set on R X 10,000 and probe across the capacitor terminals. You should see a momentary jump in resistance then the meter returns to infinity. Reverse the meter leads (polarity) and probe the terminals again. Watch for a momentary jump in resistance and the peter returns to infinity. (no momentary jump = bad capacitor)
  • Next test the power diode by reading resistance in BOTH directions (reversing leads / polarity) Is should only read resistance like a wire in ONE direction and be OPEN in the other. (Resistance in both directions or no resistance at all = bad power diode)
  • After you have located and replaced the bad component REPLACE THE FUSE that will be in the fuse block at the end of the main power cord wire. Just follow the cord to the fuse block. The fuse will either be a 15 or 20 Amp Slo-blow fuse.
  • Install the outer chassis cover and test.
Those are the 3 most common reasons that the unit stops working while in use. i.e Capacitor, Diode and Fuse. There are other things that can cause it: Magnetron, Controller and the Door Interlock Switch but I would try the above and I am pretty sure you can bring it back to life. Either way unless you just want a new microwave a repair tech is going to do exactly as I stated.

If you need more assistance feel free to respond here with any questions or concerns. I will gladly help you.

Thanks for choosing FixYa,

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1 Answer

GE spacemaker xl 1800 died while cooking,has power to outlet, no display or lights, won't work at all.

Hi and welcome to FixYa. I am Kelly

When a micrwave quite during use it does have a tendancy to make the user wonder just what happened. There are several components that can cause this symptom.

1. The High Voltage Capacitor
(item 49)

2. The diode in the diode cable has failed
(Item 50 in the link above)

3. An open thermostat (Item 110) of above link (there are 2 of them)

4. A failed Magnatron (Item 73) This is pretty rare that a magnatron fails... It is usually something else.

Since you do not have any lights or appearance of power the fuse is probably blown.
(Item 47)

It can also be the duct thermostat item 27 but again this is a rare failure.

Usually what happens is either the HV Cap or the Diode in the Diode wire fails.

IF you even attempt repair... make sure to short across the HV Cap terminals at least 3 times. The first time if the cap is good it will really make a bang and spark.

To test the diode wire... "unhook / disconnect one end of it and use a meter to read it using resistance. One direction it should read. Reverse the leads and it will appear open.

There are a few other things like interlocks, HV transformer and control panel board that can cause this but again the instances of failure are pretty slim.
Replace the 20A fuse in the fuse holder. IF it blows again either the diode or the Cap is most likely the problem

An informational note... IF someone opened the door slowly without pressing pause / stop it can via the door interlock switch blow the fuse.

Hopefully this give you a clue as to what has happened and what to look for as far as repair and expected expenses.

Thanks for choosing FixYa.


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Microwave went blank when I hit defrost... not working; no even clock.

This will probably use a 15A ceramic fuse and will draw about 13 amps when running.

A microwave can be dead for many reasons.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the thermostat to open. When it cools, it closes the circuit and allows power through again. This may mean you'll need a new magnetron.

If it's random, it may be a bad connection, usually on the control board or fuse holder.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

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

If you or a friend decide to look into it, we have critical safety information and disassembly information at our site, linked here on Fixya:

Please write back with more details if you need further help.

We appreciate your thoughtful rating of our answer.

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Something has failed in the high voltage supply to the magnetron. There are no user serviceable parts inside, but there are INSTANTLY LETHAL voltages present. Scrap the oven & get a new one, they are generally not worth reparing.

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