DDR4 testing CARDS fully the , for AMD all DDR4 interface board, leds to indicate 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 motherboard Equipped 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 circuit Material:PCB colour:green Package Contents: 1 * DDR4 Test Card Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.