Versão atual de: joshAU

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Postagem original de: joshAU

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Hi. [br]

Hopefully its something simple, however worst case you could be up for a new computer or a motherboard.[br]

However, in all likelihood, your hard disk will be fine, as will all your files.

If, in the worst case, your motherboard is faulty, you can simply plug your hard disk into a desktop computer via the SATA connections and copy the files from there, or you can buy a USB enclosure to put it into and recover you files that way. [br]

[br]

Anyway, a few things to try:[br]

Remove the main battery first, then disconnect the mains power, and hold down the power button for a few seconds. [br]

Then reconnect just the power supply. [br]

The batteries have a “smart” circuit that communicates with the mainboard via a i2c SMBUS or similar, and if that locks up, it can cause the unit to fail to power on, even if the power supply is good.[br]

(If it works, reinstall the battery and retest - if it continues to fail with the battery in it, most likely the battery has failed… or extremely less likely, the mainboard battery charging circuit has a problem.)[br]

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If that doesn’t work, I’d try with a known good power supply, or alternatively test your one with a multimeter.[br]

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If that doesn’t work, you’ll need to disassemble the unit and remove the BIOS battery from the motherboard - if its a  CR2032 or similar silver watch battery, or if its hard wired/soldered to the mainboard,  with the main battery and power disconnected, short out the two pins to the battery momentarily. [br]

That will reset the BIOS to defaults, and, if the BIOS was corrupted, should fix the issue.[br]

Here is a tear down guide for your model ( There may be better guides out there though…)[br]

https://www.doovi.com/video/dell-inspiron-15-15n-n5050-teardown-disassembly-how/DTCzOTY-894[br]

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Also check if the LED light (if there is one) on the AC adapter turns off when it plugs in, if it does - there is an internal short… if so, check that none of the USB ports have been physically damaged but looking closely at them - if the positive pin is bent and touching either the USB housing or other ground point, that will create a short. [br]

If one of them is physically bent, you can try to straighten them, or at least make sure they are no longer touching a ground point. [br]

If there is a short, and the USB ports look OK, you’ll need to remove any and all components from the motherboard, and retest - it may be one of the daughter boards or other component has a short.[br]

If, after removing everything, and there is still a short, it must be in the mainboard, and would require skills to isolate and repair, and may not be viable to proceed with[br]

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Assuming there is no internal short, and if all the above fails, I’d re-seat the ribbon cable from the power button to the motherboard.[br]

Then, if that doesn’t fix it,  I’d test the power switch with a multimeter and make sure that it is actually functioning. [br]

Its rare that they fail, but they sometimes do.[br]

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If still failing, you’ll need to check with a multimeter that power is actually getting to the mainboard connection - i.e. 19 volts where the cable that runs from the DC port and goes to the motherboard is. [br]

If you are getting 19 or so volts there, then the issue is probably further into the mainboard - often one of the two MOSFETs near where the power connects to the motherboard, or the power IC (BQ737 or similar) - and would again require a technician to diagnose and repair it. [br]

Hope this information helps. [br]

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