Asus X555LD rev 3.3 black screen

[Tafita]

Hey there,

I have a problem with an Asus x555LD rev 3.3
Power LED on, battery is charging, but black screen, no fan and no HDD LED.

I tried to :
- connect with an external monitor
- reprogram bios
but no change

Can you give me any advice of how to fix it?

Thanks in advance.

[Techtiger]

Re: Asus X555LD rev 3.3 black screen

Hey there,

I have a problem with an Asus x555LD rev 3.3
Power LED on, battery is charging, but black screen, no fan and no HDD LED.

I tried to :
- connect with an external monitor
- reprogram bios
but no change

Can you give me any advice of how to fix it?

Thanks in advance.

Yes we can help you but need more info of the MOB in you mother board there are Big Gray colis test the voltage of them try with another RAM how did you reprogram bios ?

[Tafita]

Re: Asus X555LD rev 3.3 black screen

Yes we can help you but need more info of the MOB in you mother board there are Big Gray colis test the voltage of them try with another RAM how did you reprogram bios ?

Thanks for your reply.

I don't have schematic and I can't test voltages. I just noticed that BIOS voltage is 2.5V (pin 8) and I don't know if it is normal.
I tried to replace external RAM but nothing change.
I removed BIOS from the motherboard and reprogrammed with CH341A.

[Techtiger]

Re: Asus X555LD rev 3.3 black screen

here is the boardview file the voltage for bios pin 8 is less it should be 3+V the pin 8 is connected with 3 Resistors a one Cap & Diode you have test them try to change the BIOS battery with help of the boardview try to find out the voltage of all PL coils big Gary ones you have one near the SOC processor

[mcplslg123]

Re: Asus X555LD rev 3.3 black screen

I think VS voltages are not proper. You need to find out the ALW to VS mosfets and check voltage on all pins. Fan is not spinning -that does mean absence of +5V VS or it is dropping low. Had the exact same symtoms on dell N5050 nad was solves by replacing VS mosfets.