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Thread: A mouse that causes pcs to fail booting?!?

  1. #1

    Default A mouse that causes pcs to fail booting?!?

    So recently I bought a pair of Packard Bell branded mice off an auction site. I got them in, tested one. It worked. Didn't think anything else about it. Yesterday I was working on a Packard Bell machine so I hooked up the second mouse from the pair and turned on the machine. Machine hung after video bios was shadowed. Thought something was wrong with the PC. It wasn't until today while I continued testing, finding nothing wrong with the machine after I moved it to the table to work (where I have the other mouse) that I realized if I tried hooking up this particular mouse, the machine wouldn't boot. So I tried it on another PS/2 486. Same issue, but on that one it hung after reporting the 128K cache. Change the mouse. Machine works fine. Both of them. The mouse is very unassuming. It is a PS/2 Mouse, but on the one machine where it doesn't hang up on boot that I tried it on doesn't report that anything is connected. That machine is a NCR System 3230. So would it be a short in the mouse causing this issue? I can provide pictures if that will help diagnose the issue. If there is another cause that is known, any advice on how to correct whatever is the issue I will try it. Or, if there is no fix, I can take it to the recycler. I would like to try to fix it if possible first though.

  2. #2

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    never heard of this but.... The mouse is connected to a 8042 (compatible) micro controller. I can imagine that if the mouse gives the controller weird signals, the controller itself will behave weird as well. It could be sending so may interrupts to the PC that it won't boot anymore.
    You could check the behavior of the lines of a good mouse against those of the bad mouse. That could give you an answer.
    With kind regards / met vriendelijke groet, Ruud Baltissen

    www.baltissen.org

  3. #3

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    A lot of the protocol is done by holding the clock. It tells the other end to wait while it is busy. My guess is that it does part of the sequence but at some point it tells the PC end to wait and wait and wait. So it does.
    Dwight

  4. #4
    Join Date
    Apr 2015
    Location
    Austin, Texas
    Posts
    2,160

    Default

    I've had mice with shorted wires cause computers connected to them act erratically. Usually the wire will short right where it comes out the body of the mouse, since that's where it flexes the most. The solution is to cut the bad section of wire out and rebuild the end of the cable connecting to the PCB inside the mouse. Sometimes connectors are used and sometimes the wires are soldered directly to the PCB, in either case, it's not terribly difficult to resolder the wires.

  5. #5

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    I opened the mouse finally and took a look inside. There appears to be 4 resistors on the board, a controller chip I think, and the sensors for movement. I did the one thing I barely know how to do and checked the resistors with the continuity setting on my voltimeter. All of them gave me a number but one, which just showed the same as when you aren't touching the pins. Does this mean something is wrong with the resistor? Could this be the issue? An open circuit or something? Also, does anyone have a good guide to help identify the resistor ratings?

  6. #6
    Join Date
    May 2006
    Location
    Melbourne, Australia
    Posts
    6,830

    Default

    Quote Originally Posted by Nathanieltolb331 View Post
    I opened the mouse finally and took a look inside. There appears to be 4 resistors on the board, a controller chip I think, and the sensors for movement. I did the one thing I barely know how to do and checked the resistors with the continuity setting on my voltimeter. All of them gave me a number but one, which just showed the same as when you aren't touching the pins. Does this mean something is wrong with the resistor? Could this be the issue? An open circuit or something?
    Determine the value of a resistor by using the multimeter's resistance setting.

    If your multimeter has multiple resistance settings, see https://learn.sparkfun.com/tutorials...ing-resistance

    Have the equipment unpowered.

    If you get a reading that is lower than expected (e.g. 70 Ω for a 200 Ω resistor), it may be because the reading is being affected by other components in the circuitry, in which case, remove the resistor to do the reading (just desoldering one leg is enough).

    Quote Originally Posted by Nathanieltolb331 View Post
    Also, does anyone have a good guide to help identify the resistor ratings?
    https://learn.sparkfun.com/tutorials...istor-markings

  7. #7

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    What are the markings on the resistors? Maybe a picture of what you have?
    Dwight

  8. #8

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    I will try to get a picture taken of them. It has like 5 or 6 bands on it, and for whatever reason I am always confused as to which side is the side you start with. I am really missing my electronics for dummies book right now. I've searched everywhere and I can't find it. I recall it having a good guide to remind me how to read the resistors, but it has gone completely missing. After I can identify what their ratings are then I will definitely check to see if they give a proper rating.

  9. #9

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    It can be a bit confusing at first, See if this site helps https://www.hobby-hour.com/electroni...color_code.php

  10. #10

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    I've had this happen with USB keyboards, can cause all sorts of issues including delays at boot and system freezes. Took me several days of frustration pulling out RAM chips and swapping out disk drives, until I figured out that the keyboard was the culprit
    Probably a loose wire or dry solder joint.

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