--Diagnostic Card Code Table After power on, the motherboard test card directly displays "FF or 00" fault causes and troubleshooting methods (attach: computer motherboard fault diagnosis card code table) After power on, the motherboard test card directly displays "FF or 00" fault causes and troubleshooting methods (attach: computer motherboard fault diagnosis card code table)
After reading 6604856 Cat Friend's original post "How to use the motherboard error detection card", I think it is very well written, simple and easy to understand, and it explains the problem. The statement about memory and graphics card is quite correct,But I want to add something to the post that said, "If FF or 00 is displayed directly after plugging in, it means that the CPU has not started to work, and the worst case is that your CPU is dead. You should observe a 3 minute silence and then go to the computer city to spend money." I would like to talk with cat friends. Welcome to hold your fingers straight!
From my experience in repairing motherboards, if FF or 00 is displayed when I turn on the computer, the CPU does not work, but the possibility of CPU damage is far lower than the following four reasons:
I The ATX power supply is damaged. If there is a lack of a certain set of voltage supplied to the CPU, FF or 00 will also appear. You can replace it with a good power supply to try it. If it is normal, it means that the original power supply is damaged. You can use a multimeter to measure the voltage of each set in the 20 core plug of the power supply and compare it with the good power supply, and it will definitely find problems;
II Due to long-term thermal expansion and cold contraction, the solder joints under the CPU seat of the motherboard will be desoldered (solder joint cracking), and FF or 00 will also appear. Especially for CPUs with old vertical adapter cards, the solder joints of the CPU seat of the adapter card are cracked more often, which is not easy to see with the naked eye, so magnifying glass should be used.Repair method: evenly heat the solder joint with a hot air gun until the solder joint melts;
III Check whether the electrolytic capacitor near the CPU has burst. The burst capacitor will bulge up and down, which is easy to find with the naked eye. You can replace it with a capacitor of the same specification, and the fault will be eliminated;
IVThe power triode near the CPU is burned out. You can use a multimeter to measure these triodes, which usually shows a breakdown (the resistance value is close to zero). You can replace them with the same triode or a substitute triode. Friends who are engaged in repairs often remove them from the scrapped motherboard.
After starting up, the CPU fan and the video card fan stop after turning slightly, or stop after turning for a few seconds. After restarting, the fault phenomenon is still the same. Generally, the three end voltage regulator on the main board is damaged, or there is faulty soldering, or there is a poor contact, such as a broken wire or open circuit due to oxidation corrosion on the printed circuit board; If the building owner has hands-on ability, it is recommended to focus on troubleshooting the three terminal voltage regulator and its surrounding parts.
forty-five Initialize the math coprocessor.The data has been initially prepared;You are about to check the memory roll back at 0:0 and find out the size of the system memory.
45 Initialize the math coprocessor.The data has been initially prepared;You are about to check the memory returning at 0:0 and find out the size of the system memory You can clean the motherboard, or power down the motherboard and clear the CMOS. A comparison table of mainboard diagnostic card codes is attached.
