Chosen Solution
I’m 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)
UPDATE: So after ordering another button board (LS-8501P) after the first replacement part was a dud, the computer works as it should. I can’t 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.
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
If you can, try making this simple circuit to test the pinout.
Sorry for the bluntness.
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!
Hi every body im from ethiopia im fresh technicial if you have guide about all computers plz….
