Liquid crystal detection technology: liquid crystal has been recorded more than one hundred years ago, is a kind of liquid fluidity, and has the anisotropy of P89LPC935FA crystal material, its isotropic liquid order, relative to solid crystal, liquid crystal inside and between molecules with high mobility. Liquid crystals commonly used in chip failure analysis exhibit a nematic phase at room temperature, and the liquid crystal molecules are arranged along a certain preferred direction. When it is heated and the temperature is higher than a certain critical temperature T((phase transition temperature) day inch, the liquid crystal molecules are isotropic, become isotropic liquid, and the phase transition is reversible. Using this characteristic of liquid crystal, the phase transition point can be observed under orthogonally polarized light and the hot spot can be detected.