How do I replace the panels/buttons that dispense ice and water Model # is LMX28988ST

I assume you are referring to the water dispenser on your GE refrigerator. To turn off the water dispenser, you can either: Press and hold the "Lock" button on the control panel until the water dispenser display turns off. This will lock all the functions of the control panel, including the water dispenser. Locate the water shut-off valve behind the refrigerator and turn it off. This will shut off the water supply to the refrigerator and disable the water dispenser. Note: If you are trying to turn off the ice dispenser, the process may vary depending on the model of your refrigerator. Some models have a separate on/off switch for the ice dispenser, while others do not allow you to turn off the ice dispenser without turning off the entire refrigerator. Please consult your owner's manual for specific instructions.

http://www.repairclinic.com/0100_1.asp
There's an ice- or water-dispensing problem The ice and water-dispensing system of your refrigerator is quite complex. Many components work together to provide the ice and water. Aside from a simple problem of a leaky water tube or a jammed ice chute, most other components are not user serviceable. We suggest that you contact a qualified appliance repair technician for such repairs.

Dispenser control most likely needs replacing

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more than likely the mainboard in the rear of the unit is defective,as the dispenser board gets its power from the mainboard and the dispenser bpoards normally dont go bad

Replace the main control board . Pt # WR55X10942 is the part number . The dispenser board has lost communication with the main board . The main control board is behind the refrig , behind the small 8X10 inch panel . There are 6-8 group plugs which will only fit in perspective plugins , so this board is easily replaceable . Cost of board is about $150.00 .

check for a child lockout button it will look like a tiny padlock ,press and hold for 3 sec.(could be the freezer door light switch)

you need to replace the board in the dispenser front housing on the front of the freezer door / larry

may i know the exat model no

there is no program, replace the board.