Hi,
I don't remember the laptop model on top of my head, but the motherboard model is Quanta U83, with discrete graphics.
After liquid damage, the laptop was turning on for 2 seconds after pressing power button, then shutting off. Cause : no CPU VCore.
I replaced a 1k resistor and ran a jumper between the buck controller and the resistor and I got VCore back.
Now, the issue is that when the laptop wasn't turned on for an hour, it turns on fine and shows an image but shuts down after a minute.
If I try to reboot it immediately, it doesn't show an image and the fan gradually spins up, and it eventually shuts down.
If I try again, it would shut down after a couple of seconds.
If I try again another time, the charger IC doesn't turn on the main MOSFET and I get no power.
If I wait a couple of minute, the charger IC works again. If I wait more, I may have get display for a short time again.
If I bypass the main MOSFET, same symptoms but I get power everytime obviously.
Liquid damage was found mainly around charger IC and CPU VCore controller.
With those symptoms I would say I've got an issue with the EC (KB9010), but there was absolutely no liquid there. I may have an issue with the charger IC, but I guess that if I bypass the main MOSFET, the laptop should still boot.
What do you think ?
I don't remember the laptop model on top of my head, but the motherboard model is Quanta U83, with discrete graphics.
After liquid damage, the laptop was turning on for 2 seconds after pressing power button, then shutting off. Cause : no CPU VCore.
I replaced a 1k resistor and ran a jumper between the buck controller and the resistor and I got VCore back.
Now, the issue is that when the laptop wasn't turned on for an hour, it turns on fine and shows an image but shuts down after a minute.
If I try to reboot it immediately, it doesn't show an image and the fan gradually spins up, and it eventually shuts down.
If I try again, it would shut down after a couple of seconds.
If I try again another time, the charger IC doesn't turn on the main MOSFET and I get no power.
If I wait a couple of minute, the charger IC works again. If I wait more, I may have get display for a short time again.
If I bypass the main MOSFET, same symptoms but I get power everytime obviously.
Liquid damage was found mainly around charger IC and CPU VCore controller.
With those symptoms I would say I've got an issue with the EC (KB9010), but there was absolutely no liquid there. I may have an issue with the charger IC, but I guess that if I bypass the main MOSFET, the laptop should still boot.
What do you think ?
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