... SD power supply tester is a robust voltage, tester for PC-power supply. ATX,BTX and ITX compliant, power supplies can be tested. LCD’s ... " ring, if no flicker then the power supply output voltage is normal.c. If a certain voltage signal was not detected, or the ... ) 12V power Good (PG)Connectors : Floppy, HDD, CDROM, SATA, 4 pin (P4),8 pin (Dual-CPU),6 pin (PCI-Express) LCD power supply tester ...