JVM 1540DN1BB Key pad not working - LG LMVM1935 Convection/Microwave Oven

check the touch pad or control unit any short circuit in the control unit, other wise any moisture at control unit chec the circuit other wise replace the touch pad.

see the next steps. God bless you
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 be the control. Check the tech sheet if they can point you to the right part.

Steam got into key pay. Sometimes it will dry out. Take key pad apart and try to dry with a hair dryer, not to hot, you just want to blow condensation out of it. If this does not work, key pad needs to be replaced. The problem is they cost as much as a new microwave.

The problem with the turntable could be the following:

1. Gummed up lubrication or bad bearings. Check to see if there is any food on the turntable spindle.
2. If that is ok, check to see if the belt is loose or broken.
3. If that is ok, check the motor. A meter will confirm whether there is power going to the motor, when you depress the keypad on button. Use the AC Volts setting, if you have about 21 VAC and the motor does not work, then the motor is bad.

F3 Key panel (touch pad) shorted This code will occur if a shorted key panel is detected continuously over 60 seconds. Replace key panel (also called touch pad).

Have GE JVM1440BH light and fan that are operated by the touch pad do not work. Both stop working at the same time. Ideas????

F3 - ( shorted key panel ), will occur if a shorted key panel is detected continuously over 60 seconds.
Note: It will take a minimum of 1 minute of run time before the F code will be displayed.

P/N WB27X10165

The beeper sound level can be adjusted.

Press the "BEEPER VOLUME" pad on the keypad, then select 0–3 for mute to loud.

Your owner's manual is here.

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Your Control Key Pad is a circuit with each function and button a switch. The pad on your TV Remote, and Telephone is no different. The Key Pad is failing, It will only get worse. Determine if you can replace the Touch (Key) Pad. Not the Control Circuit, just the Touch Pad. Sometimes you can get it seperate. It connects by a Flex Cable to the Control Circuit.