Sony Vaio VPC-SB26FG wont turn on, won’t power on, no display, black screen problems

Laptop Sony Vaio VPC-SB26FG 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 Sony Vaio VPC-SB26FG 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 Sony Vaio VPC-SB26FG 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 Sony Vaio VPC-SB26FG 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 Sony Vaio VPC-SB26FG 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 Sony Vaio VPC-SB26FG 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 Sony Vaio VPC-SB26FG. 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 Sony Vaio VPC-SB26FG 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 Sony Vaio VPC-SB26FG 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 Sony Vaio VPC-SB26FG 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 Sony Vaio VPC-SB26FG 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 Sony Vaio VPC-SB26FG. The failed electronic component has to be replaced.

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

Motherboard dead; The Sony Vaio VPC-SB26FG motherboard has to be replaced.

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For other Sony Vaio VPC-SB26FG problems check the comments or write a comment.

One thought on “Sony Vaio VPC-SB26FG wont turn on, won’t power on, no display, black screen problems

  1. Solved Problem

    Laptop Sony Vaio VPC-SB26FG with no power at all current draw was 0.01A when connecting the power adapter to the laptop. this model is known by shorted capacitor probem.

    Sony Vaio VPC-SB26FG wont turn on, won’t power on, no display, black screen problems

    the black connectors in yellow rectangles on the motherboard shorted with each other and to the ground.

    when soldered regulated power supply terminals to the points shown GREEN. The voltage was set to 1.5V, the current to 3A. The capacitor in a RED rectangle became hot immediately. So, the capacitor in a RED rectangle it was shorted to the ground. After I have removed it, all the shorts with black 6-pin and 10-pin connectors went away. The cap was replaced by a compatible 10uF/25V ceramic cap, and laptop turned on.

    Of course, in your case this can be ANY other capacitor or semiconductor, but the main method is the same: apply safe voltage (lower than the intended voltage for the shorted circuit) to the shorted circuit and slowly raise the current while controlling the temperature of the board (with your hands or using any pyrometer).

    Good luck.


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