5 phenomena analysis to solve the cause of the motherboard power supply short circuit

Most users in the case of no circumstances, the motherboard power supply is shorted, but do not know. Then you can't open the machine and take it directly for repair. I don't know if it is broken! I think others are fooling him! In fact, detecting whether the motherboard is short-circuited, there are 5 phenomena analysis here, which can help users to solve! In the end, what is the motherboard? 1. Red 5v or yellow 12v short circuit, power protection And can not be forced to boot 2, purple 5v short circuit, in the standby state, some components will have obvious temperature anomalies, using the standby voltage have the components of the boot function, such as: I /O, South Bridge, standby voltage generating components, PS /2, USB interface, memory power supply components, etc., sometimes in the standby state, all the indicators of the test card slightly bright, can be forced to boot, after power-on, the short-circuit component is more obvious. 3. Orange 3.3v can be turned on when short circuited. The temperature of the damaged component is obviously abnormal after booting. Some motherboard PCI slots have no 3.3v power supply. It is normal for the test card to be off. Sometimes the test card indicator blinks continuously after power-on. 4. When the green line is short-circuited, the power-on will automatically turn on and cannot be turned off. It is related to the damage of the directly connected components of the green line. Common ones are: triode, gate circuit, I/O, south bridge and other components. 5. When power protection occurs on the main board, it is related to the damage of the main power supply part Q1 field tube. The red 5v and orange 3.3v are short-circuited at the same time and the south bridge is damaged.