My tv is changing channels it self

The memory IC to your TV is faulty. Check and replace it. This is an eight solder terminal IC, can be located very near to main system control IC. Even though physical size to this IC is so small, function to it in circuit, when the TV works is great. You must have thofough knowledge in electronics to do this work, because, you might have to enter its service mode option to do some adjustments. This work is very skilled one, as service mode option window, and normal user window are entirely different to each other. Adjusting wrong data value to service mode options might make the TV irreparable, and irresponsive.