Laptop motherboard power button connector
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Posted: 08/22/2019 Options
How to short the power button switch to turn on the laptop?Im helping a friend fix his M5-581t laptop. It could be turned on but then it would shut down unexpectedly after a few seconds. At first, I though it was either the AC adapter or DC jack. Both of these were tested and replaced. I also did test where I removed the RAM, 20G SSD, Hard drive etc. I have been able to keep the laptop on by briefly shorting it on with the power button flat ribbon cable and then disconnecting it. I think the button on the board is broken turning off the computer. A replacement part has been ordered but I am weary that it will actually get shipped. (The part is also unavailable on ebay or any other site except Aliexpress) So, The ribbon cable has 8 pin-outs, it it possible to use another power button switch from another laptop? Also, What on the switch board could be making the laptop shut off? Update (08/22/2019)I tested the switch button with a multi meter and it seems to work as it should. Also, I'm attempting to figure out the pinout. so far I have 1 - ? 2 - ? 3 - LED 1 - Orange 4 - LED 1 - Blue 5 - LED 2 - Orange 6 - LED 2 - Blue 7 - S1 (Switch) 8 - Ground (S1) Answered! View the answer I have this problem too Subscribed to new answers Is this a good question? Yes No Voted Undo Score 1 Cancel Comments: UPDATE I received the new switch and installed it but still have issues. The laptop stays on and the LEDs for the battery and AC adapter work but switch itself does not. It does nothing when pressed. I have tried going through the power settings to adjust what the button does in the Windows software but that does not work. I have also tried updating the drivers int he ACPI computer hardware but that also did not make a difference. I though maybe the board is somehow grounded by/to the case (like the battery) but am I wrong to think this can't be the case since I can short the laptop on while it is open . . . I will retest the old and new power board switch today. But, any suggestions would be helpful. 09/03/2019 by Milo Add a comment 0/1024 Cancel Post commentPosted: 09/19/2019 Options
UPDATE: So after ordering another button board (LS-8501P) after the first replacement part was a dud, the computer works as it should. I cant be sure until I desolder the button but it seems like it broke while being closed so it would immediately turn the laptop off when it would turn on. Thank you everyone who responded and gave me ideas and suggestions. Was this answer helpful? Yes No Voted Undo Score 0 Cancel Comments: Can I ask where you ordered the replacement button board from? 12/17/2019 by Gaming with Omar Okay... I have 2 Acers, the older laptop started shorting & shutting down like you described. I fixed it by going into Admin. Settings right at start up and doing a total reset.. if a laptop has power I can fix it myself. Now the newer Acer (older also) laptop shut off fine the last time I used it, but when I went to turn it on later... it's out like a light bulb...won't & I know it's not the: Charger, battery or power button...I'm totally stumped! 02/11/2021 by Joy I. Add a comment 0/1024 Cancel Post commentPosted: 08/22/2019 Options
Hi @nonserviam , Have you tried searching using the "board number only" to find other suppliers? Here's a supplier that showed up by searching for "M5-581t power button board" not the board number Don't know your laptop but try moving a magnet over the board. Some power button boards have a magnetic switch in them that operates when the lid is closed to signal the BIOS to turn off the backlighting power to the screen. The magnet is in the lid. It may be what is connected to pins 1 & 2. Just a thought Was this answer helpful? Yes No Voted Undo Score 2 Cancel Comments: @jayeff Thank you for the link! I actually have a part on order (i looked by part number - LS-8501P ) but i'm waiting from a response from the seller. But, I will keep the seller you linked to in mind. Thank you for the suggestion. I'll try that out with the magnet. 08/22/2019 by Milo Hi @nonserviam , Haven't tried it but see if this link works to get the motherboard schematics so that you can maybe find out why the switch doesn't work. Did you test the new switch with an Ohmmeter to prove continuity between pins 7 & 8 if any when the button is pressed/ not pressed? 09/02/2019 by jayeff @jayeff Yes and No. I did test it but perhaps incorrectly. I will actullay redo my testing today. I originally test the switch in two ways. first, at the end contact point - pressed and unpressed and then at the end of the ribbon cable. The switch 'seemed' to work just fine so I figured I did it wrong or something else is triggering the shutdown. 09/03/2019 by Milo Add a comment 0/1024 Cancel Post commentPosted: 08/22/2019 Options
If you can, try making this simple circuit to test the pinout. Sorry for the bluntness. Was this answer helpful? Yes No Voted Undo Score 2 Cancel Comments: Thank you for the schematic. I may try that if I get a resistor. I don't really keep any on hand. 09/02/2019 by Milo Add a comment 0/1024 Cancel Post commentPosted: 02/02/2021 Options
I know this is an older thread, but I thought you would like to know, I had the same problem with a customers computer today. Since I could only find one of these used on e-bay at a cost of $45, and didn't want to try and wait on china. I took a soldering iron, and heated the solder joints (very tiny) around the switch, and the component labled D1. It actually worked. No more problems, powers on and off as advertised. It's worth a shot if you need another board anyway! Was this answer helpful? Yes No Voted Undo Score 0 Cancel Add a comment
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