Since there was no smoke, it's not a transformer. It's most likely a high voltage diode or magnetron. The magnetron would be over heating and opening a thermal cut out mounted to or near it.
SOURCE: Samsung Over range Microwave
Mine just started today too. I am thinking of taking a ball bat to it. Samsung foriegn made piece of shit.
SOURCE: Samsung MU3250W Shut down
It could have been steam or humidity.
If this is an over the range model, be sure you always use the hood vent exhaust fan when you're cooking on the stove top.
Whether it's a counter top or over the range top, always be aware that the cooling fan is running when it's cooking.
When in doubt feel for air flow through the vents.
Good luck.
SOURCE: Samsung MW1080STA Microwave Oven
This
is due to a defective or loose magnetron causing electrical
interference and disruption in the control circuit board.
If
your magnetron was recently replaced, it may have loose mounting nuts
or bolts or maybe the wire mesh RF gasket was not installed or got
pinched.
It may also need a new high-voltage diode and stirrer, and the cavity may be affected.
If
you or someone you know decide to look into it, we have critical
information on safety, disassembly and door switches at our site, and
our link is at our listing here on FixYa.
If
it's within the magnetron portion of the warranty (usually 5-9 years)
but out of the original full warranty (usually 1 year), then your
manufacturer will cover the part cost, but not the cost to visit you or
the labor charge to do the work.
You can order Samsung parts here.
You can find your nearest Samsung-authorized service center here.
To find out if yours was recalled, please call Samsung's Service Division at 800-932-3837.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
SOURCE: Bulbs UNDER the microwave burned out; new bulbs don't work
i know this is going to make no sense . but in my samsung service cd it is in BOLD PRINT YOU MUST DISCONECT POWER BEFORE REPLACEING BULBS , OR DAMAGE TO TIMER WILL RESULT ! the first time you changed them did you disconect power ? if not , your board might be toast , $$$$$$$$$
SOURCE: Killed the microwave by running it empty for 30 minutes.
YES THERE IS AN INTERNAL FUSE OR DIODE YOU CAN CHANGE, BUT YOU SHOULD BE CAREFUL AN LET A PRO DO IT, YOU JUST DON'T WANT TO GET ZZZAPPPP WITH THE CAPACITOR THAT STORAGES HIGH VOLTAGE INSIDE TO PROVIDE THE MICRO WITH POWER, IT MAY SEEM LIKE A LIL UNIT BUT IT CAN HURT YOU IF YOU DONT DE-ACTIVATE IT RIGHT, NOT SURE IF THE DIODE WOULD BRING IT BACK BUT CHECK WITH A SERVICE MAN, BEFORE DOING ANYTHING I WOULD!
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