Chosen Solution
Took in a dead HP 11-v031nr chromebook that had a moderate amount of corrosion on the motherboard, which was cleaned with IPA. This allowed the chromebook to charge the battery again. However, despite having the chromebook plugged in overnight and seemingly having a full battery, the chromebook does not power on. Its charge light simply glows white when plugged in, then goes out and stays dark when unplugged. If there are specific spots on the board I need to test for that can be pointed out, or any solutions otherwise, those would be appreciated, as I am still new to motherboard diagnostics and other aspects of that nature.
Edit 9/12/2021: Keyboard pictures
@theflamethrower The power button being part of the keyboard with only the one cable makes me wonder if there is a pair of wires in the ribbon cable in the keyboard that signals the motherboard’s Input/Output chipset. (This chipset is not the one that connects the peripheral devices, rather the one that controls the functions of the motherboard e.g. power light, other lights etc). With other laptops that have a separately wired (or hard wired to MB) Power button, usually it connects directly to the chip i.e. earth at Power button is used to signal IO chip to start (or to stop) the laptop. Looking at the maintenance and service guide for the laptop it appears to have a wide keyboard cable i.e. lots of wires, so maybe one is an earth and one other is the wire from the PB. See if you can identify the two wires by placing your Ohmmeter between a wire and every other wire in the cable (do this for all wires) and press the PB on and off to see if they connect to it. This is all guess work as without a schematic (I couldn’t find one either) I don’t know how it would signal the board to turn on. Also just because the laptop is charging this doesn’t mean that other parts of the motherboard are getting the power they need when the laptop is in the off position. The power button is not a power isolating button,it merely signals what needs to be done, so there must be some power on the board somewhere. Even if it is a Standby +3V, this may be good enough to power the IO chip so that when the power button is pressed the laptop can be fully turned on from the state that it is in. Hopefully you’re following my theory ;-) Update (09/12/2021) Hi @theflamethrower , Just to add to my answer. I’ve located a schematic for a HP Chromebook 11 G4 that may help. (there is a problem viewing the schematic on ifixit at the moment. I have notified the admin so hopefully they’ll rectify it soon. In the interim there is an image below. Alternatively click on the link and try to view the document and then click on History > Download and download it to your PC and then view it there as it will open properly this way.) NOTE: This MAY NOT BE THE SAME as for your board but hopefully may give an insight as to how things might work! On p.26 in the KB (KBC) (keyboard controller?) box on the page, there is a wire from the keyboard cable on pin 25 designated Power_On_L which connects to main IC on p.27 on pin M2 and also is shown on p.16 & p.18 of the manual. Hopefully this doesn’t mean the Power On LED rather than the power button On p.14 it gives the Power ON sequence. Just reiterating that this may be nothing like your board as far as pinouts etc BUT it may give an idea of how it works and also hopefully manufacturers wouldn’t change things that much. Desperate times call for desperate measures. ;-)
(click on image to enlarge)
