Asus K42F wont turn on, won’t power on, no display, black screen problems

Laptop Asus K42F 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 Asus K42F 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 Asus K42F won’t start up, and there is no display just a black screen. Possible problem and the fixes steps:

Battery has no charge left + AC adapter failed; you press the power button on laptop Asus K42F 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 Asus K42F 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.

Power circuit in wrong state or Over volt protection trips; you press the power button but nothing happens, laptop Asus K42F won’t turns on and there is no display just a black screen, 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 Asus K42F. This should restore the system to normal operating mode.

Hardware failure; the laptop powers on, but there is no display just black screen with Power led lights ON or your laptop Asus K42F 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.

Screen faulty or bad video cable connection; laptop Asus K42F 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, press the appropriate key to switch to it. 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.

BIOS failed; Laptop Asus K42F won’t turn on at all, if the voltage 19V, 3.3V, 5V OK  and electronics components on the motherboard are good, there is chance you have failed BIOS. There is a signal test confirmation on EC/SIO pin name RSMRST# . This pin must available 3.3V(tolerance 10%) than Bios Confirmed OK. If the test failed reprogram or replace the BIOS chip.

Laptop Power System has problem: Laptop Asus K42F won’t turn on at all, probably some electronics components or chipset on the motherboard failed;  Disassemble the laptop and take out the motherboard. Ceck No burnt marks visible on the mainboard. Check chepset temperature (CPU,  GPU, Power-Supply IC …). Check power jack. Check motherboard receives 19V. with a Multimeter measure voltages on coils, check for any components shorted to ground.  checked 3.3v/5v is up and running?

If you  have 3VALW And 5VALW at coil. 3VALW should go to sio and from there you should get 3v at power button. Check SIO for corrosion,shorting or any componenets which looks suspect. Check 3 & 5v SUS voltage.

Will need an electronic boardview or Schematic Diagram for Laptop Asus K42F. The failed electronic component has to be replaced.

Note: (In the comments we will be updated electronics components failure).

Motherboard dead; The Asus K42F motherboard has to be replaced.

Read Also

For other Asus K42F problems check the comments or write a comment.

2 thoughts on “Asus K42F wont turn on, won’t power on, no display, black screen problems

  1. smilo

    hi mates!!!

    i just wanna ask for help about this weird problem of mine..

    i got a laptop asus k42f laptop w/ i3 cpu with no display at first. then i flash bios and its works and i notice keyboard is not working fine then.

    i was replaced the keyboard cos some keys are not working. then now it works.

    after a week it comes back to me and client says that the keyboard was not working and its typing character by it self. so i replaced it with another one.

    but the problem is still the same. its typing by it self even i disconnect the ribbon of keyboard to the mainboard.

    i used usb keyboard but it still the same.

    i also think it might be bios issue. but it was not cos i already tried to flash the bios 2nd time.

    any idea would releave my stress.

    thanks in advance.


Leave a Reply

Your email address will not be published. Required fields are marked *

Type the numbers you see in the image below *