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Not familiar with this particular set, but a couple of observations:
Sets vary as to whether or not the front panel controls override the remote. For example if you hold down the volume up button on the front panel while holding down the volume down button on the remote. On some sets the volume will do up, others it will go down.
The little tact switches typically used for front panel controls can fail stuck on, especially if the previous owner was heavy handed with the controls or the set spent some time exposed to the weather before you got it.
Noise on the supply rail to the microcontroller (often 8V or 5V, 3.3V or even 2.5V in some recent sets) can cause some strange problems. I've had a couple of sets that would intermittently freeze up, get stuck in a loop, fail to respond to the controls, even activate functions/menus not present on that model. These faults caused by bad caps or bad regulators.
That said sometimes it is the microcontroller itself and sometimes similar faults have beaten me . I gave up on one Sony that would continuously go up through the channels like your set.
One final option to get some use out of the set especially if analog is dead in your area is to brute force the set onto AV. I've done this on a couple of sets with weird microcontroller/tuner faults that lived out the rest of their days as monitors. Check the datasheets for the microcontroller/jungle ICs for details.
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