DDR4 testing CARDS fully the , for AMD all DDR4 interface board, use leds to indicate that the data line address line open circuit and short circuit.Used to repair is not switched on, does not display, does not read failure such as motherboard, memory is an essential instrument for repair computer motherboardEquipped with battery (CR2032, 3V) insert battery to insert the test card and insert into the corresponding type of motherboard, and insert the CPU motherboard, presses the switch button, test card can assess motherboard memory part of open circuit.Short circuit fault If a lamp is not clear, Could memory and CPU holder or with short circuit, memory slot is damaged If a light, clear, must check the signal and supply circuitMaterial:PCBcolour:greenPackage Contents:1 * DDR4 Test CardOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.