- Model Number
- PVM9179SF1SS
- Brand
- GE
- Age
- 1-5 years
GE microwave, model PVM9179SF1SS. No power at all, so here is what I did so far.

1. Noticed one of the connector/terminal to the transformer's primary side was burned.
2. Checked thermal fuses, two of them circled in the attached image were burned out (checked with ohm meter, no continuity, right side on the bottom plate and on the magnetron). Replaced both and power was restored.
3. Now, when the door was open, microwave made continuous humming noise.
4. So I suspected transformer due to the burned mark on the primary terminal. Resistance across primary terminals was around 0.1 to 0, no shorts, resistance between body and secondary terminal was around 90 ohm. Thinking transformer was bad, I replaced that as well.
4. Still there was humming noise when door was open
5. Inspecting little closer, it appears that humming noise may be coming from the magnetron.
My next step was to replace magnetron, but I thought let me run it by here in this forum to get better and may be more definite idea of what may be wrong. I did not test the door switches yet since they are little hard to get to.
Any suggestion would be greatly appreciated.
Thanks

1. Noticed one of the connector/terminal to the transformer's primary side was burned.
2. Checked thermal fuses, two of them circled in the attached image were burned out (checked with ohm meter, no continuity, right side on the bottom plate and on the magnetron). Replaced both and power was restored.
3. Now, when the door was open, microwave made continuous humming noise.
4. So I suspected transformer due to the burned mark on the primary terminal. Resistance across primary terminals was around 0.1 to 0, no shorts, resistance between body and secondary terminal was around 90 ohm. Thinking transformer was bad, I replaced that as well.
4. Still there was humming noise when door was open
5. Inspecting little closer, it appears that humming noise may be coming from the magnetron.
My next step was to replace magnetron, but I thought let me run it by here in this forum to get better and may be more definite idea of what may be wrong. I did not test the door switches yet since they are little hard to get to.
Any suggestion would be greatly appreciated.
Thanks