GE JVM1750SMC02 over the range microwave help

[caddylover]

Just trying to do a diagnosis on whether its a capacitor or magnetron/diode.  I have 120v coming from my mother board and when i start the microwave the 120v stays as 120v and doesn't drop.  I have all functions such as light, turn table turns, appliance "hums" but i have no heat.  

Just trying to whittle things down before i either buy a new one, or try and salvage this old one.  Door switches were replaced about 2 years ago.  This unit has lasted 12 years and wife likes it and would prefer to keep if it's cheap enough to diagnose

 

thanks in advance

[DJJoshyBeats]

Two things you can check before getting into the high voltage stuff (magnetron, capacitor, etc) would be those door switches and the fan motor. I know you said the door switches were replaced but it’s worth checking those for continuity. If you have the wiring diagram then you can check those switches with a multimeter. One of them will have opposite value of the other two (it will be open when the others are closed).
I tried to look up your model and couldn’t find if it had a circulation fan. But if it does then if that fan isn’t working it won’t be able to move the hot air into the cabinet. Also I attached a picture of a typical ge thermostat. Check those for continuity too. 

[Vance R]

Check to see if 120 vac is getting to the HV transformer. If that is good check amp draw into the HV transformer. Let us know the results.

[caddylover]

i did by a new LG but kept this older one as a project / extra for downstairs bar area.   i will get to it and post results.  sorry for the late reply and thank you for your advice!