Optical fiber welding machine screen cannot display, short uneven unable to weld?

Optical fiber welding machine screen cannot display, short uneven unable to weld? Welding machine prompts the left ( On the right) Fiber smudgy or surface is not flat, unable to weld the problems caused by the factors to analysis from the following points: ( 1) Tips about parts have sundry, or cut fiber end face is not flat, 2) Mirror lens with debris impact analysis of optical fiber welding machine screen can't show the problem caused by the factors to analysis from the following points: ( 1) Display power supply and cable connection is normal (not 2) Is able to see when the phone is switched on board information, such as not may be a motherboard problem ( 3 boot can see motherboard information, may damage the screen, or optical system.