1700 test lamp PCB comprehensive upgrade, the product adopts modern high-tech non-hole process. Can not see PCB hole on the pad, all protect the CPU seat, not damage the CPU seat because of the hole. Use steps:1, put the 1700 test light in the CPU slot and down the iron cover of the CPU seat (note that the motherboard is not powered on), and lean against the battery holder of the test light with the 2032 3V battery, and the DMI signal on the test light be all lit. These signals are connected to the North bridge chipset, if the light is not on, it indicates that the signal has an open short circuit fault, and the CPU pressure rod can be shaken to further determine the fault point with the help of a multimeter. 2, after the DMI signal of the motherboard is normal, then use a multimeter static resistance method to measure other control signals of the test lamp, the power supply voltage test point, and determine whether the signal is open and short circuit abnormal according to the size of the resistance. Note: 1, when using the 1700 test light, pay attention to the positive and negative terminals of the battery, and the battery should not be installed. When loading the CPU seat, handle it gently and be careful to bend the CPU seat . 2, after using for many times, the test light becomes dark, because the battery voltage of the test light is not enough, please replace the battery by yourself. Color: Black Material: PCB Package Contents: 1 x Tester Only the above package content, other products are not included. Note: Light reflection 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.