Laptop Dell Inspiron 15 N5040 won’t turn on, won’t power on, there is no display, just a black screen. This is a general diagnostic and repair steps to fix those problems.
Troubleshooting laptop Dell Inspiron 15 N5040 won’t boot, won’t power on, no display just black screen
When you push on the Power Button the Power led lights ON or NOT, your Dell Inspiron 15 N5040 won’t start up, and there is no display just a black screen. Possible problem and the fixes steps:
Battery has no charge left with AC adapter failed; you press the power button on laptop Dell Inspiron 15 N5040 nothing happens, laptop won’t turns on and there is no display, the battery has no charge left, the motherboard doesn’t receive any power, laptop cannot turn on. You plug in the AC adapter but that doesn’t help, your laptop Dell Inspiron 15 N5040 still won’t power on, there is a chance you have failed AC adapter. In this case try with another charger or check AC adapter with a Multimeter. If it’s dead, replaced with a new one, (How to check AC adapter with Multimeter).
Power circuit in wrong state or Over volt protection trips; you press the power button but nothing happens, laptop Dell Inspiron 15 N5040 won’t turns on and there is no display just a black screen (AC adapter is OK), your laptop has static electric charge made power circuit in wrong state. Unplug AC adapter, take out the battery and hold down power button for 30 seconds, the static charge will dissipate. Plug in the AC Adapter and turn on your laptop Dell Inspiron 15 N5040. This should restore the system to normal operating mode.
Screen faulty or bad video cable connection; laptop Dell Inspiron 15 N5040 turns on, but screen is black, with Power led lights ON. Test the laptop with an external monitor connected to the HDMI port, VGA port or any Display port, press the appropriate key to switch to it (Fn key + F4 key in most laptop). If the external monitor works fine and load the operation system, most likely you have a faulty screen or bad video cable connection. Check them and replace the faulty one.
Power button failed; When you plus in the AC adapter the charge led lights on, (and there is no static charge), but laptop won’t turn on when you press the power button. Probably you have a Power button failure. Disassemble the laptop and with Multimeter test Dell Inspiron 15 N5040 power button (ON/OFF) Continuity, if there is no continuity when you push on the power button. The Power button has to be repaired or replaced; you can also try to short the power button borne with conductor wire to see if laptop turns on, (How to Test Power Button).
Hardware failure; the laptop powers on, but there is no display just black screen with Power led lights ON or your laptop Dell Inspiron 15 N5040 stock on logo or restart. In this case, it’s possible one of the Hardware failed. You can try to disassemble the laptop to bare minimum and try to reseat the hardware one by one and power on the laptop every time you reseat a hardware to know the failed one, replace the faulty hardware,
Some electronics components or chipset on the motherboard failed; Laptop Dell Inspiron 15 N5040 won’t turn on at all. Disassemble the laptop and take out the motherboard. With a Multimeter check electronics components continuity, Voltage and Chipset temperature, you will need an electronic Schematic Diagram for Laptop Dell Inspiron 15 N5040. The failed electronic component has to be replaced, (How to test Laptop Power System). if Dell Inspiron 15 n5040 won’t turn on and when you plug the AC Adapter, the AC Adapter LED turns off or blink, in this case you have a common problem in Dell Inspiron n5040 caused by a short in SMD capacitor (Read this article). If Dell Inspiron 15 n5040 make seven (7) beeps at start up with black screen you have a problem with ISL 62882C Power IC Chip (Read this article).
BIOS failed; Laptop Dell Inspiron 15 N5040 won’t turn on at all, if the Power System and electronics components on the motherboard are good, there is chance you have failed BIOS, reprogram or replace the BIOS chip (How to reprogram (Flash). Laptop BIOS).
Motherboard dead; The Dell Inspiron 15 N5040 motherboard has to be replaced.
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