How to check the motherboard?
If your computer has ceased to function, you should look for the cause of its failure. If you suspect that the cause was a failure of the motherboard, then it must be tested. But before checking the motherboard one should know what the main reasons for its breakdowns are, because after that they will be easily fixed.
Checking the motherboard
To check the motherboard for performance, you must have a working processor and a working power supply. After you disassemble the processor and get to the motherboard, first of all it should be examined for visible defects. It is necessary to check all capacitors, are they bloated? Since the main reason for the inoperability of the motherboard are they. If the inspection revealed bloated capacitors, then such a card should be replaced because it will not work stably anymore. If the capacitors are OK, then you should reset the CMOS.The jumper located on the motherboard next to the battery is marked CLR_CMOS or CCMOS. There are three contacts on it, with the first and the second closed in the standard mode. To reset the settings, you need to close the second and third contacts for a few seconds, and then return the jumper to its previous position.
Next, you should unplug the power supply and disconnect all cables from the motherboard, leaving only the power supply. In addition, you need to disconnect from it all the devices. Then you can remove all the boards from the slots and RAM. It only needs to leave the processor installed. After that, you must turn on the power supply and start the computer. If the speaker emits a signal, the RAM is faulty. If there is no sound, then the motherboard is not working and should be replaced.
Sometimes the computer does not work because of a video card malfunction. In this case, the operation of the motherboard can be checked by disconnecting the power supply from the network and installing the memory module in the first slot. Then you should turn the unit back on to the network and start the computer. If the speaker emits a video card error message and the BIOS splash screen appears on the monitor, the motherboard is operational.
If the above methods did not produce results and the question of how to check the performance of the motherboard remains relevant, then perhaps it does not work because of some poor-quality device. To test this theory, turn off the LPT connector, mouse, and other devices when the computer is turned off, and turn on the computer. If it is working properly, then the motherboard has nothing to do with it, you need to change one of the devices. And if the PC still does not work, then the problem is in the board's malfunction.
Often the motherboard does not function if the Reset button is not working correctly. It happens that she is "short." To do this, disconnect the F_PANEL - RS wire from the board and check whether the system case itself is "short". You can put it on the dielectric. It would also be nice to check the voltage on the BIOS battery. So if it is less than 2.9V, then it needs to be changed. Now you know how to check the performance of the motherboard and you can fix all the problems yourself.