1.No touching drive, the wire connecting touchscreen with main board is defective, the control card of touchscreen or the internal USB is defective, or the touchscreen itself is defective. Check all possible reasons above one by one, then change accordingly.
2.Try the operation of 9 or 25 points linearity correction, if still cannot work, probably the control card or touchscreen is defective, need to change touchscreen
3.Try the operation of 9 or 25 points linearity correction, if still cannot work normally, probably the control card or touchscreen is defective, need to change touchscreen
Change touchscreen