When fault occurs, the red light on the panel, therefore, it is bad standby power supply or the CPU does not work. Because of the lights on the panel is by standby power supply for the power supply, light is controlled by the CPU. Failure, such as the measured P3:12 feet STB7V to 0 v. Detecting standby switch power IC851 forward without work, IC851:7 feet have 300 v, after repeated examination, found that is 1 foot D857 direction, smaller resistance for euro 140. After the new, boot, OK.KX7service manual download site