System board also know as motherboard

Laptop main board system board

A system board also known as motherboard or mainboard is the main circtuit board in any laptop. Unlike desktop PC system boards, laptop system boards come in thousands of different shapes and sizes. Laptop motherboards are model-specific. In other words, you cannot remove motherboard from a Toshiba laptop and stick it into a Dell laptop. All parts inside a laptop are connected to the system board, either directly via a connector mounted on the system board or through a cable.

In a typical laptop the following ports and components are permanently attached to the system board and cannot be easily removed and replaced without soldering:
1. Hard drive (HDD) connector.
2. CD/DVD drive connector.
3. Memory (RAM) slots.
4. Battery connector.
5. Keyboard connector.
6. Audio (headphone and microphone) jacks.
7. Volume control wheel.
8. USB ports.
9. Eithernet (RJ45 aka network) port.
10. IEEE 1394 (Fire Wire) ports.
11. Video chip and some other components and ports.

System board, processor (CPU) and LCD screen are the most expensive parts in any laptop. In some cases, when one of these three parts fails, it’s cheaper to buy a brand new laptop than replace the failed part. But each case is different so do your research.

System board removal

The system board is mounted inside the laptop base assembly. In order to remove or replace the motherboard, you’ll have to disassemble the whole laptop.


When a system board fails, you may experience the following most common problems with your laptop. 1. The laptop is completely dead. There are no LED light activity when you press on the power button or plug in a known good AC power adapter. 2. The laptop starts but the video output on the LCD screen or external monitor is garbled. Most likely this is related to the VGA chip failure. 3. The laptop turns on without video on the screen and the power LED starts flashing. 4. The laptop works fine with AC power adapter but will not charge a known good battery. If that’s the case, most likely there is something wrong with the battery charging circuit or DC power jack.

Posted in Laptop parts
308 comments on “System board also know as motherboard
  1. Christian says:

    hola. tengo una toshiba Satellite A305-S6872, el problema es: enciendo la laptop y anda todo los leds pero pasa de 10 a 15 segundo y se apaga y se inicia. luego de tanto inicios enciende pero queda en el logotipo de windows 7 y no es legible.. lo conecte a un monitor externo y pasa lo mismo.. probe con un cd booteable de windows xp portable y arranca bien ni un tipo de problema, tambien probe con el hairen boot y anda todo.. Cual es el problema de mi lapto?? “” sera el sector de arranque del disco duro””” ya me fije el chip de video y a simple vista se ve bien no esta dessoldado..

  2. sandie bryan says:

    Hi,good afternoon i ave a GATEWAY laptop but whenever i plug in to charge it switch off and won’t come on for days. Now it’s not coming on at all. One day it was charging n it drop with the charger plug in. Please can u tell me wat is the problem.

  3. Sokolayam says:

    pls sir i have a Laptop Dell Inspiron 150m and if i power it on when the battery is on it, it wil not ON but if i remove the battery it wil ON. pls what is the problem sir.

  4. frenchmal says:

    Hi ,

    on my laptop Brand ” Toshiba satellite A200 2BH ”
    the fuse on the motherboard seems to be blown…?
    the ac adaptator is on and work (tested)
    where do i find the main fuse on the motherboard?
    Do you have photo please

    Regards thank before

  5. gary says:

    My Toshiba Tecra M1 wont turn on -All there is a blinking amber light on the power symbol.Thanks for any advice.

  6. ero says:

    my compaq presaio cq40 is not formatting. It does not pass ‘setup starting windows’ i have use almost all the operating system but its still the thing. I need your assistance.

  7. drake says:

    My L310 have power problem. when I start plug the power adapter the light of DC indicator starts to flicker and when I remove the battery the DC indicator stops to flicker but It can’t start to open. The Battery is Ok because when I put it I can use my laptop, the only problem put my AC adapter in my laptop its start my my screen brightup then down. What I see my battery won’t charge up and see my battery icon plug then unplug the source. I try to mo touch the adapter and dc plug but it always that way. You think you could help me?

  8. tahir india says:

    i have toshiba m70 satellite pro,its working fine but when i m lifting ma lap it stuck or restatrt smtimes blue screen,if any1 interested in buying text me +919700158949 frm india anhra pradesh hyderabad

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