hi, my brother has a stone nt308 laptop, one of the usb ports were broken exposing the 4 pins and my sister went and plugged the charger into that scoket causing the laptop to get 19v through the usb port :I, the laptop chargers but will not power on... when the power button is pressed the power led flashes until i let go of the button. is this laptop dead or can it be fixed? i cant really take the motherboard out etc but i can take the back panel off to get tot the cmos bat, ram, and cpu.
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Re: blown mobo?
Clear short of usb pins. Once I had same problem with hp. -
Re: blown mobo?
+1
How did you determine that any of the USB pins were hit with 19v? The charger plug 19v may not have contacted the pins electrically. It's more likely that inserting it shorted the vulnerable USB pins. USB is hot swappable. If the +5v was shorted to ground at the busted USB port it might take the +5v rail down but not likely damage internal parts.Comment
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Re: blown mobo?
USB 5V power is switched through mosfet so regulator is not damaget. it try to switch on so 3,3V and 5V rails are ok. just the 5V switched rail have short on capacitor i think. that capacitors is for 6,3v so it can be shorted.Comment
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Re: blown mobo?
well the charger was on and when she plugged it in the charger led went off so im guessing it shorted and now when trying to power it on it just flashes the power led ive tried leaving batter out powering on with just charger etc still nothing the usb pins are also not touching anymoreComment
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Re: blown mobo?
also the laptop was closed at the time so im not sure if it was on or in sleep mode. the battery still charges so the fuse isnt blown in the charger or the chrarging circuit atleast. im just hoping the southbridge isnt fried because that will mean the laptop is uselessComment
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Re: blown mobo?
the led that flashes isnt the poiwer led.. its the charge led which means its shorting the charger out when trying to power on too.. is there any fuses similar to the ones on hard drives that create a dead short when blown? if so i could just remove it and it should work again?Comment
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Re: blown mobo?
Dude READ my previous post and work as i wrote.Comment
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Re: blown mobo?
the fan doesnt spin or anything just the charge led goes out when button is pressedComment
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Re: blown mobo?
no brain?Comment
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Re: blown mobo?
Laptop or him?Comment
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Re: blown mobo?
i dont understand what you meant in your post... ive never worked on laptop motherboards before and i didnt know if you meant a surface mount cap or a polymer oneComment
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Re: blown mobo?
just check 5V switched rail ffor short and continue to remove itComment
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