LG microwave quit working

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  #1  
Old 12-12-11, 01:45 PM
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LG microwave quit working

Tried to turn on, as soon as start button pushed light came on then quit. Took off case, fuse is ok. Checked door switchs, all 3 ok.
Checked with power again but nothing, no display, no set clock.
Looked on net no real TS procedures so started to look for new
microwave. Reassembled MW and as a last thing plugged it in,
nothing, so I smacked the top as a last desperate measure for
another few hundred down the drain. It powered up! Put a cup of
water in it and hit start, same thing lights on for a second then
nothing.
Its an over range LMVM2085 3 years old the month.
 
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  #2  
Old 12-12-11, 05:06 PM
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I believe I'd start troubleshooting by checking for the proper voltage at the receptacle, you want to see 120 volts or something no more than 5% higher or lower. It's possible you could have a poor connection somewhere in the circuit that breaks down under load of the microwave.
 
  #3  
Old 12-12-11, 06:58 PM
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Thats not the problem. If I found the fuse inside I checked power 122 v and I checked the GFI and I checked the breaker. I plugged it into a different recp also.......
 
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Old 12-12-11, 07:10 PM
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Blown diode, blown capacitor, blown circuit board, blown magnetron, blown transformer?
 
  #5  
Old 12-13-11, 05:33 AM
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When the lights come on the Mag starts also then quits.
I'll keep looking for a replacement.....
 
  #6  
Old 12-13-11, 08:29 AM
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Originally Posted by rooksroost View Post
When the lights come on the Mag starts also then quits.
I'll keep looking for a replacement.....
Above my skill level. I can only quote parts.
 
  #7  
Old 12-13-11, 05:19 PM
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Microwave ovens have *very* exacting and sensitive switches on the door to assure the door is completely closed.

With that said, closely examine the inside of the door and its mating surface on the oven. Look for any partlcles of food which might be holding the door open even every so slightly. Be sure the door can close completely.
 
  #8  
Old 12-14-11, 09:39 AM
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Be very, very careful inside a microwave. The capacitor in the voltage doubler circuit which feeds the magnetron usually stays charged to about 2,000V long after the power has been disconnected. It should be bled through an appropriate resistor on an insulated stick before service. Even many appliance repair shops no longer take microwaves because of the liability and danger inside the cabinet.
 
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