The machine does not recognize the keyboard, mouse ps2

When the machine doesn’t settle for the ps2 keyboard and mouse, you should use the USB keyboard and mouse, as a result of the ps2 port is managed by the IO chip, and the USB port is managed by the male chip. You could keep in mind clearly to keep away from correcting errors. To repair the issue that the mainboard doesn’t acknowledge the USB port, you have to take a look at the block map, which chip manages the ps2 port.

In accordance with the diagram above, we see that the SIO chip controls the keyboard and mouse by 2 sign traces, Knowledge and Clock. The place knowledge is the info line and clock is the clock pulse. And a couple of pins 1 foot obtain VCC 5V energy by the F1 or F2 fuse positioned behind the ps2 port to guard when the important thing, the mouse is brief, the fuse will break, 1 floor connection.

As well as, you have to listen: The keyboard is managed by the BIOS program, and the mouse is managed by the working system (home windows). In accordance with the above block diagram, we all know the the explanation why the mainboard doesn’t obtain the ps2 port are:

Lack of VCC 5V voltage for keyboard and mouse
Because of the filter capacitors related to the info pin, the clock is detected, rusted or touched.
Because of the BIOS program error for the keyboard failure, and the home windows error for the mouse not acknowledged illness.
As a consequence of open pins or port administration chip ps2 is SIO defective.

Steps to repair the ps2 port.

+ Step 1: Test if the ps2 port has a voltage of 5V by turning the mainboard the wrong way up, utilizing a meter to regulate the 10V DC scale, plug the black rod into the bottom and plug the purple rod into the VCC pin.

PS2 port pinoutThe image above is the pinout on the ps2 port usb machine and on the mainboard. 2 NC pins make it lovely, but it surely does not imply something. If 5V is measured, the PS/2 port has voltage. If no voltage is measured, you proceed to switch the fuse f1, f2, f3 … positioned close to the PS2 port. To seek out the fuse, look behind the ps2 port. Or use the best way of measuring continuity, regulate the ohm meter to the x1 scale, put 1 rod on the 5v foot and 1 stick within the parts I believe to be a fuse, if the impedance is the same as O Ω, it’s the fuse.

To find out whether or not the fuse is alive or useless, you additionally use the 2-pin circuit measurement of the fuse, if the impedance is  O Ω, the fuse has not damaged. In any other case, if the impedance is bigger than  O Ω, the fuse is damaged -> change one other fuse.

Fuse and filter capacitor ps2 port+ Step 2: If the ps2 port nonetheless has voltage however doesn’t obtain the important thing, you proceed to take away 4 filter capacitors connecting the info and clock pins as proven above.

+ Step 3: The filter capacitor after discharging nonetheless doesn’t work, you then proceed to recharge the bios for the mainboard if the affected person doesn’t obtain the keyboard. Reinstall the working system if the mouse is just not acknowledged. Notice: if the pc doesn’t acknowledge the mouse, if you happen to take a look at the mouse, the sunshine continues to be on, it’s essential to reinstall home windows first.

+ Step 4: This can be a fairly severe illness, now simply must re-solder the SIO chip, if it would not work, change the brand new SIO chip. Easy methods to change the IO chip, I discussed you guys check with: Change the IO chip for primary .

These are the steps to repair the ps2 port illness. If you don’t get to step 3, in case you are not eligible, it’s best to use a USB port, as a result of changing the IO chip if it fails, it’ll trigger a illness that can’t set off the supply, lose the reset sign, or make the machine flicker. Want success.
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