Acer Aspire 4750Z wont turn on, won’t power on, no display, black screen problems

Laptop Acer Aspire 4750Z 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 these problems.

First case laptop Acer Aspire 4750Z won’t boot, no display just black screen

When you plug the AC Adapter into the laptop Charge led lights ON, when you push on the power button Power led lights ON, but your Acer Aspire 4750Z won’t boot, there is no display just a black screen.

Possible problem and the fixes steps:

  1. Power circuit in wrong state; 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 the AC Adapter and turn on your laptop.
  2. RAM or Hardware failure; your Acer Aspire 4750Z powers on, but there is no display just black screen with Power led light ON. It’s possible the memory module (RAM) failed. In this case you can try cleaning and reseating or replacing memory. If reseating / replacing memory doesn’t help, try removing the hard drive, DVD drive, wireless card, SD card, keyboard, etc… In other words, disassemble the laptop to bare minimum and test again one by one, replace the faulty hardware.
  3. Screen faulty or bad video cable connection; laptop turns on, but screen is black, with Power led and Hard Drive led lights ON. Test the laptop with an external monitor connected to the VGA or HDMI port, press the appropriate key to switch to it (Fn key + F4 key in most laptop). If the external monitor works fine. In this case most likely you have a faulty screen or bad video cable connection. Check them and replace the faulty one.
  4. Some electronics components on the motherboard failed; disassemble the laptop and Check electronics components continuity, Voltage and temperature with a Multimeter. Check Laptop Power System, you will need an electronic Schematic Diagram for Laptop Acer Aspire 4750Z. The failed electronic component has to be replaced.
  5. BIOS failed; 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.
  6. Graphics Card failure; your Acer Aspire 4750Z won’t boot or turn on and restart without display just a black screen. Test the laptop with an external monitor, if there is no display on the external monitor, probably you have failed Graphics Card, try to repair graphic card with heat gun or replace it.

Second case laptop Acer Aspire 4750Z wont turn on, the charge led lights ON

When you plug the AC Adapter into the laptop, Charge led lights ON, but when you push on the power button, nothing happens, laptop won’t turn on, and Power led stays OFF.

Possible problem and the fixes steps:

  1. Power circuits in wrong state; same procedure as problem 1 in first case above.
  2. Hardware failure; remove the hard drive, DVD drive, wireless card, SD card, keyboard, etc… In other words, disassemble the laptop to bare minimum and test the hardware one by one, replace the faulty hardware.
  3. Power button failed; Test Power Button ON/OFF Continuity with Multimeter, if there is no continuity when you push on the power button. The Power button has to be repaired or replaced.
  4. Some electronics components on the motherboard failed; same procedure as problem 4 in first case above.
  5. BIOS failed; Reprogram (Flash) Laptop BIOS.
  6. Graphics Card failure same procedure as problem 6 in first case above.
  7. Motherboard dead. The motherboard has to be replaced.

Third case laptop Acer Aspire 4750Z won’t turn on at all

When you plug the AC Adapter into the laptop there is no lights. When you push on the power button, nothing happens. The laptop appears to be completely dead.

Possible problem and the fixes steps:

  1. The AC adapter failed; the battery has no charge left, Motherboard doesn’t receive any power from 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.
  2. Some electronics components on the motherboard failed, in most case the power jack fail or electronic component directly after power jack fail.
  3. BIOS failed; Reprogram (Flash) Laptop BIOS.
  4. Motherboard dead. The motherboard has to be replaced.

Acer Aspire 4750Z useful links:

How to Test Laptop Power System.

How to Reprogram (Flash) Laptop BIOS

How to Repair Laptop Graphic card.

 

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