Microwave light is burnt out

change the bulb

You have to take the out side cover off and there you will see how to change the bulb.

There is a short in the circuitry. Replace it or have a professional repair it.

R-820BK/BW Microwave Operation Manual
Due to the risks of death or serious injury the above owners manual suggests that a burnt out light demands a service call by a qualified technician.
That said, if you have a basic level of competence and read the safety hazards involved with microwaves (see a good resource on microwave safety and repair at:
http://www.kellerstudio.de/repairfaq/sam/micfaq.htm
Often, the microwave is divided into two main compartments, the electronics compartment(usually immediately behind the front control panel), and the high voltage compartment(usually behind the electronics compartment). The light bulb is likely in one of these two primary compartments. If it is in the high voltage compartment with the HV Capacitor and magnetron, changing the bulb becomes much more dangerous.
Please be very careful if you do decide to do this on your own... unlike most electronics microwaves can remain lethal, even when unplugged. Hope this helps.

I have ran into a few of these that shorted out the control board when the light bulb burnt out. Depending on how far you want to go, you can take out the board and look for a burnt spot and possibly repair the board. Or purchase a new board, which may be more than what you want to put into the microwave.

how do I change the little light bulb on the top to take off the cover what do i need.

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It probably is, but I cannot find your model number on the Daewoo website to look in the manual.

Please confirm and reply the model number .

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

This can often also affect the exhaust fan operation, too. The lights and fan can be inoperable or stuck on too.

Details of our service and critical safety information and disassembly information is at our site, linked here on Fixya:
http://tinyurl.com/yzjozk

The control circuit board needs to be removed and repaired. We routinely repair these from customers nationwide for $32.50. It sure beats the cost of a new board!