on all other ranges it keeps on doin auto ranging with weird values.
I don't work for Keysight, but let's get a baseline on what is happening with your meter. Since I can't see what you are seeing, please answer the following questions (or post a youvideo showing its behaviour).
Q1) Set meter to autoranging DCV. Measure a 9V battery. What does lcd show? Is the reading steady or jumping all around?
Q2) Set meter to autoranging DCV. Short the probes together. Does it show a steady 0?
Q3) Set meter to autoranging ohms. Measure a 1k ohm resistor. What does lcd show? Is the reading steady or jumping all around?
Q4) Set meter to autoranging ohms. Short the probes together. Does it show a steady 0?
Q5) Set meter to manual range DCV. Measure a 9V battery. What does lcd show? Is the reading steady or jumping all around?
Q6) Set meter to manual range ohms. Measure a 1k ohm resistor. What does lcd show? Is the reading steady or jumping all around?
Q7) Please post clear focused pictures of your meter. We want to see both sides of the pcb and the range switch. We want to see if there is anything obviously wrong with your pcb and/or rotary switch.
Q8) Have you or someone who may have borrowed your meter measured anything high voltage (i.e. > 240V)?