Interior light staying on in GE JVM1790 and

1. Defective door interlock
2. Control board failure

They do have a main power fuse behind the control board.

If that is the little bulb that lights up under the unit: http://www.partselect.com/PS2351821-GE-WB25X10019-Halogen-Light-Bulb-120V-20W.htm?SourceCode=5&SearchTerm=JVM1790&ModelNum=JVM1790

WHEN THE BULB BLEW IT PROBABLY BURNT OUT VIOLENTLY AND DAMAGED THE RELAY ON THE MAIN BOARD THAT CONTROLS IT. WILL PROBABLY HAVE TO REPLACE THE MAIN POWER BOARD WHERE THE RELAY FOR THE LAMP IS LOCATED

GE has the manuals for most of their appliances on their site: http://www.geappliances.com/service_and_support/literature/ . Just enter the model number and click Submit.
The direct link to the manual for the JVM1790 Over-the-Range Convection/Microwave oven is here: http://products.geappliances.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=49-40480-1.pdf . GE only lists the JVM1790CK, JVM1790BK, JVM1790WK and JVM1790SK.

I hope this helps.

Cindy Wells

The only fix for it is to either buy another control board $300+ or if you are any good at wiring you can go the the hardware store get a manual toggle switch and install it under the microwave on the right hand side near the control area. But make sure the switch can handle the heat rising from the stove burners. We have about 120 of the microwaves on our properties and 6 of them have this issue. The relay internal switch becomes corroded and binds together from steam and boiling water. GE is JUNK.

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

Make your own template of the holes in the top of your cabinet and lay it over the new unit and see if they align. As long as your replacing GE with GE it probably will work.

Very easy to replace...at least on my JVM1790. Remove the top vent....the long plastic thing that runs along the top of the MW. Two screws on top of the micro. Behind the charcola filter (if you installed one) is an access area to the bulb. remove one screw and the entire assy comes out. Simply R & R the bulb.

The interior oven light can be accessed in the following way:
1.Open door and remove the top grill via the 2 screws along the top edge.
2. In the interior light will be under metal plate with fasten by single screw. The halogen bulb is rated at 120V 20watt. Looks like a G-8 bulb with 8mm pin spacing with o.a.l. 1-5/8" long

Get these bulbs cheap at http://www.1000bulbs.com/120-130-Volt-G8-Base-Halogen-Light-Bulbs/