The lightning M34300N4-721SP damage of microprocessor, after replacing a microprocessor, such failures. Estimation is the microprocessor does not match with the original model, replacing a M34300N4-721SP fault still. Information and access to the relevant journals, learned that the microprocessor replacement needs to be decrypted before reaching the normal state. Method is: replaced microprocessor Hou, boot appeared white grating Hou, by remote control Shang of s key 4 seconds around, screen Shang displayed "SP" character Hou, quickly by digital key 0, and 1, screen Shang displayed "SP01" character, by TV Shang of MEMO key for storage, makes SP01 character disappeared; shut machine Hou again boot, can lifted microprocessor of lock state, entered normal of control state. In this case after the above operation, troubleshooting.