hi
yup several possibilities
1) signals no longer coming from the microprocessor
2) signals are coming from the processor to the display driver but the driver is failing
3) signals are coming from the display driver to the display but there are faulty segments on the display
4) connection faults between any of the above sections
a high probability it wont be repairable
have you opened it up ?
if so show us a sharp and well lit pic of both sides of the circuit board
cheers
Dave