电脑主板维修（国外英文资料）.docVIP

电脑主板维修（国外英文资料） Maintenance method and bad fault determination The 2009-09-23 they Maintenance method and bad fault determination Main means of maintenance of 4-1 For the maintenance of computer motherboard, like the doctor to the patient, need look, smell, ask, cut. Look: see whether the main board has obvious bad appearance, such as whether the component parts of the main board are not even tin, have no soldering, the component Reverse, wrong, shift, etc. PCB has broken lines and so on. Smell: if the main board component is burned, it will emit a burnt smell and find out the damaged components. Q: it is mainly based on the poor reason description, the range of the fault, the specific maintenance. Cut: refers to the quantity, measurement, and the use of inspection equipment to assist the inspection. The common test equipment is multimeter, oscilloscope, digital card, etc. 4-2 dont boot First, use the oscilloscope to measure the working voltage of the CPU, the clock signal on the CPU, and the return signal is normal. Measure the clock on BGA, PCI, DIMM, and reset signal. After the failure, plug in CPU, memory, and digital card, if the digital card jumps from C1 to 26 The fault has been ruled out if the digital card shows FF, C0, C1, or no. 26 indicates that the board has a failure. 51 4, FF, C0 indicates that the CPU is not working, and the A/D (address signal/data signal) on the CPU block is checked with A multimeter. A/D signal line on the line, PCI, if the resistance of A signal line is bad, repair it and plug in the device Display is OK. 5, the digital card shows C1, which indicates that the main board has no memory connection, and checks the clock signal and voltage of the DIMM slot. If there is an exclusion, it is OK; If the clock voltage is normal, use the multimeter to check the A/D on the DIMM Control signal is normal, if have, eliminate it. There is a chip called BIOS on the motherboard that can be burned, and the BIOS is interpreted as a basic input/output