I need help figuring out what is wrong with my multimeter. It's an Amprobe 240. I don't know how it happened exatcly but the knob was acting weird for a few weeks with the screen going on and off when selecting the DC function. You can see in the attached picture the burnt trace I cleaned but didn't help. Without measuring anything the multimeter is showing 1.052 V DC, 25.86 kOhm, and 144.1 uA. I also get wrong readings for resistors using the relative button.
Anybody knows how to find out what's wrong? Can I fix it or is the main chip toast?
Thanks.