Surface light no longer works

get a new one

its a bad switch

If it's not heating at all, the magnetron is to blame.

It is most likely one or two defective door switches, "common problem with this unit.

In this case as the display does not show a clock then it seems the program controller is not working correctly. So check power - step down supply, if the pads are responding- if not faulty pads. Also the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean,solder and reset the board.

Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

Now unless the display works and the processor starts to switch on the MAGNETRON , the table and light will also switch on as it must heat.

So it is necessary to check the main controller unit as it seems to be the suspect..

If there are 2 bulbs try swapping them around. If the night light works then you just need a bulb. Take the bad one with you and match it up at a parts store. Some actually have a dimmer circuit programmed in the board and that will not be a easy fix. Do you hear a click when you try to activate the night mode? If you cannot find a bulb or do not want to replace or repair the unit just disclose the non working light. I was in real estate for a couple years and a burned out bulb will not be a deal breaker as long as they are told up front.
Eric

I have the same problem. The left one burns out within a couple of hours use, the other one lasts a couple of months and is then gone. This pattern has repeated over 8 years. I replace them every now and then and then just go without until I get the urge again to fix it. Maybe smaller lower wattage lamps are worth trying...

hi check that the door catch is locking into place maybethe locking mec is not engaging or triping the micro switch ,if it does n't trip the switch it won't turn light off and unit won't work
cheers grant

(If yours is not a Samsung, please reply back with your brand and model!)

Sadly, we hear of this over and over.

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.

They may even send you a replacement magnetron.

You can order Samsung parts here. You can find your nearest Samsung-authorized service center here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

This is a problem with the control panel assembly, which we repair nationwide for $39.95. Details are at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk