A computer host removed the motherboard due to dust removal. When reinstalling, it was found that the power reset switch on the chassis panel, the hard disk power indicator, and the plugs of the speaker and the two USB terminals were not marked. The plug cannot be restored and cannot be used.
Therefore, using the functional characteristics of each device on the panel, try to insert one by one in order. Considering the socket pin group connected to the panel plug on the motherboard, it generally only has a low voltage and low current (except the USB pin group), so it is a bold test.
First find the position of the plug of the power switch. The method is to turn on the power, then press and hold the power switch on the panel, and insert the plugs of the switches one by one in the seat pins. When the fan of the switch power supply is started after being inserted into a certain two support pins, it means that the power supply switch pin may be found correctly. Note: If one pin of the plug is inserted into another grounding pin, so that the power supply can also be started, but the remaining one or more plugs will not find the correct position. If this happens, just insert a pin hole of the switch plug to the adjacent pin. After turning on the computer, find the needle of the power indicator. Because the light-emitting diode is a polar component (the same as the hard disk indicator), if the plug is reversed, it will not light, so try to insert it positively and negatively. If during the hard disk reading time, if two pins are flashing, the set of pins may be the seat pins of the hard disk indicator, then the hard disk indicator can be inserted. If the brightness of the indicator is relatively bright or dark, this situation is regarded as a wrong sign, and you should continue to search.
Next, find the needle position of the seat of the reset switch, press and hold the reset switch, and insert the plug of the switch to the remaining needle position, if the system resets. This group is the position of the reset switch. The remaining speaker plugs can easily find the location where they should be plugged in, using the characteristics of the computer alarm sound. In principle, the speakers are also divided into positive and negative poles, but the small speakers of the chassis can be divided. Because the plug of the USB terminal is two four-pin plugs. The shielded wire insertion position of the two sets of connectors is the negative electrode. The USB socket pins on the motherboard are a row of 8 pins. Assuming that the head or tail pins are the first pins, using a multimeter, the 1 and 8 pins are + 5V (voltage to ground), and the 4 and 5 pins are negative (to ground) resistance). This shows that the 1st hole of the plug is + 5V, the 2nd and 3rd holes are the data bit, and the 4th hole is the negative bit (shield layer), the same is true for the other group, so the two plugs are inserted into position. At this time, it is best to use MP4 to test the USB terminal, because the USB power supply loop of MP4 has a diode. It will not be damaged if the power supply is reversed. The above method is a last resort, perhaps a fluke without problems. If you find that the definition of the seat pin is unclear when you disassemble the motherboard, you should make a record and then unplug the lead of the panel to avoid unnecessary trouble.
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