PCI-E 8X 4X slot tester can diagnose the open circuit or short circuit of motherboard PCI-E slot quickly. Instead of manual testing, it can find the error easily without knowing the resistance value.
Connect a 9-12V DC power supply to the PCI-E 8X 4X slot tester, and plug to the PCI-E 8X / 4X slot of the motherboard.
Press the on/off switch of the tester, and all the lights on the tester will be on. If some lights are off, please check whether the foot of south bridge is open circuit or short circuit, or the isolate capacity is damaged.