Fault phenomenon: After boot, the power indicator is not bright, no display.
Analysis and maintenance: According to the analysis of the fault, the power indicator is not lit and explains the DC circuit exception. The measurement of the stream bridge has an output, but the pressure drop fluctuates greatly. Shutdown, static lower test switch is normal, normal; such display generally has an overcurrent (or overworthy) protection device, when the line scanning circuit outputs an abnormal, the power supply voltage is 110V, thus judging the row scanning loop " Overload "phenomenon; uses a multimeter to detect line output circuits, and it is found that the damping diode has been obedient to form a path. After replacement, troubleshooting.
What is the case?
