Keypad needs servicE - GE JVM1850 1000 Watts Microwave Oven

in circuit

PCM/Smart board (comes with the keypad), If it is less that 30 days beyound the 12 month warranty call GE and ask for a "good will concession" ... 1800-GECARES

You'll need to carefully removed the keypad assembly and look for moisture etc.

see this steps and follow and fix it. God bless you
If you have a stuck key or non-responsive key, most of the time you will have to replace the keypad for this microwave oven repair. If your keypad is connected to your control board by a flat ribbon wire, try disconnecting it and clean the silver contacts with an ordinary pencil eraser. After cleaning, plug it back in and try it. If it doesn't fix it, replace the keypad unit. Some units actually have keypad tests to confirm your diagnosis of a bad key.
If your keypad and control is the same unit, replace that unit. Another note, unlike stove/oven keypads and controls, most microwaves do not have error codes or tests to distinguish whether it is truely the keypad or control. Most of the time, it is the keypad that needs replacing, but a small percentage of the time it can b

If the keypad is shorted it will need to be replaced, also! the control board should be checked.

The keypad control board or smart board needs attention," membrane in keypad is shorted"

the membrane gets dirt under them and shorts out the keypad,you may as well just replace the control board which includes the display and keypad on the same board

there may be a circuit problem in the keypad.
need to contact the samsung microwave service centre.

Obtain a replacment keypad and replace it. The non serviceable contacts inside of the key pad or going bad.