an idea, fuse or coil powering the ps2 mouse port died .

weedeewee wrote on Today, 12:06:

an idea, fuse or coil powering the ps2 mouse port died .

Is that fixable? How do I find out if it is that?

RetroPCCupboard wrote on Today, 11:31:

Any ideas what might have happened? I don't think I changed anything between the time it worked, and when it stopped.

Did you by chance connect or disconnect the PS2 mouse while the system was powered on?

The PS2 port isn't designed for "hot plugging" and that could have damaged it.

Joseph_Joestar wrote on Today, 12:33:

Did you by chance connect or disconnect the PS2 mouse while the system was powered on?

The PS2 port isn't designed for "hot plugging" and that could have damaged it.

Good suggestion, but no. It was on my testbench working fine. Turned off machine. Left it overnight. Came back in the morning, turned it on and was greeted with an error in windows saying there is no mouse.

RetroPCCupboard wrote on Today, 12:26:

weedeewee wrote on Today, 12:06:

an idea, fuse or coil powering the ps2 mouse port died .

Is that fixable? How do I find out if it is that?

Either figure out were the coil/fuse is on your mainboard and measure continuity on those, or measure if you still have +5v on your mainboard ps2 connector by using a multimeter and looking at the correct pinout. 😀

Is it fixable... depends on how proficient you're willing to be with a soldering iron, if that is the problem.

weedeewee wrote on Today, 13:45:

Either figure out were the coil/fuse is on your mainboard and measure continuity on those, or measure if you still have +5v on your mainboard ps2 connector by using a multimeter and looking at the correct pinout. 😀

Is it fixable... depends on how proficient you're willing to be with a soldering iron, if that is the problem.

Ok. I will get out my multimeter and check for power on the port. Seems odd to me that the keyboard works, but not the mouse. I thought they were usually the same controller circuitry?

RetroPCCupboard wrote on Today, 13:58:

weedeewee wrote on Today, 13:45:

Either figure out were the coil/fuse is on your mainboard and measure continuity on those, or measure if you still have +5v on your mainboard ps2 connector by using a multimeter and looking at the correct pinout. 😀

Is it fixable... depends on how proficient you're willing to be with a soldering iron, if that is the problem.

Ok. I will get out my multimeter and check for power on the port. Seems odd to me that the keyboard works, but not the mouse. I thought they were usually the same controller circuitry?

In short, there are two issues under discussion.
1. If I replace the capacitors with polymer ones, will the universe collapse?
The answer is 42.

2. The mouse/keyboard have stopped working.
There are two types of capacitors at the inputs of these ports
- with COG/NP0 dielectric (Intel motherboards)
- all others.
The first type can withstand anything, but they are expensive.
The second type – as always.
When the second type starts to leak due to age, they short-circuit the mouse/keyboard signal lines. This is a common problem.
There may be either 4 separate capacitors or an array of 4 in a single package.
If there are any issues with them, simply delete them.