测试卡显示详解（Test card display detail）.doc

测试卡显示详解（Test card display detail） I. overview The working principle is the detection results using the diagnosis card motherboard BIOS internal self-test program, be displayed through the code with the book code meaning lookup tables can quickly know the computer fault. Especially in the PC machine can not boot the operating system, black screen, speakers do not call, the use of this card to better reflect its convenience, so that you get twice the result with half the effort. BIOS in each boot, the system circuit, memory, keyboard, video, hard disk, floppy drive part and other components of the rigorous testing and analysis system of hard disk configuration, configuration has the basic I / O settings initialization, everything is normal, and then guide the operating system. The salient feature is that the key components are tested before the cursor appears as a dividing line. A critical component fails, forcing the machine to shut down, and the monitor has no cursor, and the screen does not respond. Then, test the non critical components, continue to run the faulty machine, and insert the card into the expansion slot when the monitor is not shown. According to the code shown on the card, refer to what kind of BIOS your machine belongs to, and then find out the cause and location of the fault expressed by this book, and then you can clearly know where the fault is. Two, sixteen decimal character table Three. Part diagram of the diagnostic card Four, indicator function lookup tables Name of the lamp in Chinese CLK bus clock, regardless of ISA or PCI, as long as an empty board (no CPU, etc.) on the power supply, it should always light, or else CLK signal is bad. BIOS basic input and output, the motherboard running, reading operations on BIOS will flash. The IRDY main device is only ready to flash when it is ready to have IRDY signals, otherwise it is not lit. OSC oscillation, the main vibration signal of ISA slot, the power on the empty board should be always bright,