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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Hey everyone,
I'm a novice trying to repair my laptop. The LCD screen has an image, but no LED backlight for the image. It also produces an image when connected to an external monitor.
I have found what I believe to be a blown inductor labeled "L4502" and "120 Ohm" in the schematics (zoomed in image, blue arrow to blown component). I have included an image of the general area of the mobo and an excerpt from the schematics as well.
I am having trouble selecting a replacement component, which I believe to be a 120 Ohm ferrite bead, from the components... -
Hi folks,
I'm new to this forum. So my trusty 17-year-old LG 47" LCD recently died. As I was booting it up, I heard a hum followed by a loud bang, sounds of pieces flying around, and loss of power to the unit. Inspecting the PSU, I saw two obvious problems: a blown thermistor (bang + flung pieces) and a visibly bulging main cap. Inspecting as many components as I could with my Fluke MM, I diagnosed that the following components on the "hot side" of the board were also bad: one of the 2 main MOSFETs, main 8A fuse, small cap (25V 47uF) connected to main caps, and a blown... -
vizio e650i-a2 (LWJAOZBP Serial) led backlight flashes then turns off, has video (via flashlight) and audio.
panel: au optronics T650HVN05.4
72 led total on 12 strips, 6 led per strip wired in three groups of 24 (led driver board has three anode and three cathode pins)
link to datasheet: https://datasheetspdf.com/pdf-file/8.../T650HVN05.4/1
Vizio 56.04219.641G (liteon PA-3231-01WN-LF) Power Supply Unit
https://www.shopjimmy.com/vizio-56-0...-power-supply/
Vizio 55.75J01.001G (91.75J10.004G) Main Board... -
Hello, I search this connector (oxydated).
It's a fpc zif low profile connector. It come from camera sensor, it is very small : 0.3mm between 2 pins.
I ordered 2 from Aliexpress called « 0.3mm pitch » but one was 0.5mm between 2 pins and the other 0.6mm. In fact « 0.3mm pitch » seams to be the pad width and not the distance between 2 pins.
I can't find it. The other websites like mouser dont show the datasheet, and I can't check if it is 0.3mm between 2 pins ?
Do you know how to find this connector please ? What is the exact name for find it ?
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HP Modelnumber: 14-dh0061nb
This laptop had a shorted cap on a Vcore section. After replacement is works again. But there is still a battery issue.
The battery is HT03XL and with the built-in component test from HP, in the Power section, I get an error: Logic State: Calibration required (20), Charge state: Blown Fuse (42)
I have another same battery, also with error: Logic State: Very Weak (70), Charge state: Blown Fuse (42)
And a third battery TF03XL (looks identical) with error: Logic State: OK (0), Charge state: Blown Fuse (42)
All these 3 batteries are charging...
Comment