Introduction

The Toshiba Satellite A105-S4074 relies on its internal fan located over the main processor to keep cool; if there are issues with your system's fan, the laptop may overheat and shut down. Should replacement be required, these easy to follow instructions will guide you through the process.

Image 1/2: Turn the laptop upside down with the battery facing you. Image 2/2: Turn the laptop upside down with the battery facing you.
  • To prevent electrical shock, make sure the computer is turned off; and disconnect the power adapter from the computer and electrical outlet prior to beginning any repairs on this device.

  • Turn the laptop upside down with the battery facing you.

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Image 1/3: Right release tab will remain locked in place. Image 2/3: While still holding the left release tab, slide the battery towards you using your right hand. Image 3/3: Fully remove the battery from the laptop.
  • Slide both the left and right battery release tabs outwards away from center of the laptop.

    • Right release tab will remain locked in place.

  • While still holding the left release tab, slide the battery towards you using your right hand.

  • Fully remove the battery from the laptop.

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Image 1/2: Open the laptop all the way so that the screen is horizontal with the body. Image 2/2: Open the laptop all the way so that the screen is horizontal with the body.
  • Turn the laptop back over so it is right-side up, with the cover facing up.

  • Open the laptop all the way so that the screen is horizontal with the body.

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Image 1/3: Using the plastic opening tool, pop up the right tab along the top of the panel that is connected to the hinge for the widescreen display. Image 2/3: Pry up and remove the cover panel that is located above the keyboard. Image 3/3: Pry up and remove the cover panel that is located above the keyboard.
  • Using the iFixit plastic opening tool, pop up the left tab along the top of the panel that is connected to the hinge for the widescreen display.

  • Using the plastic opening tool, pop up the right tab along the top of the panel that is connected to the hinge for the widescreen display.

  • Pry up and remove the cover panel that is located above the keyboard.

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Image 1/3: Unscrew the left 3.0 mm screw that is holding the keyboard onto the laptop using the Phillips #0 screwdriver. Image 2/3: Unscrew the right 3.0 mm screw that is holding the keyboard onto the laptop using the Phillips #0 screwdriver. Image 3/3: Unscrew the right 3.0 mm screw that is holding the keyboard onto the laptop using the Phillips #0 screwdriver.
  • Position laptop so that both screws connecting the keyboard to the laptop are visible.

  • Unscrew the left 3.0 mm screw that is holding the keyboard onto the laptop using the Phillips #0 screwdriver.

  • Unscrew the right 3.0 mm screw that is holding the keyboard onto the laptop using the Phillips #0 screwdriver.

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Image 1/3: Locate where the ribbon cable connects to the motherboard, and gently open clamp. Image 2/3: Pull out  the ribbon cable connecting the keyboard to the laptop. Image 3/3: Avoid pulling directly on the ribbon cable while removing it, as this will cause permanent damage.
  • Gently lift the keyboard from either side where the screws were located.

  • Locate where the ribbon cable connects to the motherboard, and gently open clamp.

  • Pull out the ribbon cable connecting the keyboard to the laptop.

  • Avoid pulling directly on the ribbon cable while removing it, as this will cause permanent damage.

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Image 1/2: Avoid pulling directly on the antenna cables while detaching them, as this will cause permanent damage. Image 2/2: Remove the black and white antenna cables from the channel guides in the bottom half of the laptop.
  • Carefully detach the black and white antenna cables connecting the widescreen display to the Intel® Pro/Wireless 3945ABG card on the motherboard by lifting the brass connectors with your fingers.

  • Avoid pulling directly on the antenna cables while detaching them, as this will cause permanent damage.

  • Remove the black and white antenna cables from the channel guides in the bottom half of the laptop.

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Image 1/3: Unscrew the two 4.0 mm screws from the right  hinge located at the base of the widescreen display using the Phillips #1 screwdriver. Image 2/3: Gently disconnect the black video cable that connects the screen to the motherboard. Image 3/3: Gently disconnect the black video cable that connects the screen to the motherboard.
  • Unscrew the two 4.0 mm screws from the left hinge located at the base of the widescreen display using the Phillips #1 screwdriver.

  • Unscrew the two 4.0 mm screws from the right hinge located at the base of the widescreen display using the Phillips #1 screwdriver.

  • Gently disconnect the black video cable that connects the screen to the motherboard.

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Image 1/3: Turn the computer around so the screen faces away from you, and unscrew the 5.0 mm screws on the right back hinge using the Phillips #1 screwdriver. Image 2/3: Remove the display and set it aside. Image 3/3: Remove the display and set it aside.
  • Turn the computer around so the screen faces away from you, and unscrew the 5.0 mm screws on the left back hinge using the Phillips #1 screwdriver.

  • Turn the computer around so the screen faces away from you, and unscrew the 5.0 mm screws on the right back hinge using the Phillips #1 screwdriver.

  • Remove the display and set it aside.

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Image 1/3: Remove the fifteen 6.0 mm (B6) screws from bottom of laptop using the Phillips #1 screwdriver. Image 2/3: Remove the two 5.0 mm (F4) screws from the bottom of the laptop using the Phillips #1 screwdriver. Image 3/3: Remove the two 5.0 mm (F4) screws from the bottom of the laptop using the Phillips #1 screwdriver.
  • Turn the laptop over with battery slot facing away from you.

  • Remove the fifteen 6.0 mm (B6) screws from bottom of laptop using the Phillips #1 screwdriver.

  • Remove the two 5.0 mm (F4) screws from the bottom of the laptop using the Phillips #1 screwdriver.

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Image 1/3: Locate the three ribbon cables that are connected to the motherboard. Image 2/3: Gently open the clamps, and remove the cables. Image 3/3: Avoid pulling directly on the ribbon cables while removing them, as this will cause permanent damage.
  • Turn the laptop back over right-side up with the touchpad facing you.

  • Locate the three ribbon cables that are connected to the motherboard.

  • Gently open the clamps, and remove the cables.

  • Avoid pulling directly on the ribbon cables while removing them, as this will cause permanent damage.

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Image 1/3: Slowly work the tool around the sides of the case until the two pieces are completely separated from each other. Image 2/3: Remove the upper casing from the bottom casing using your hands. Image 3/3: With the laptop separated, you should be able to see the CPU fan.
  • Using the plastic opening tool, gently pry up on the upper casing of the laptop separating it from the lower casing.

  • Slowly work the tool around the sides of the case until the two pieces are completely separated from each other.

  • Remove the upper casing from the bottom casing using your hands.

  • With the laptop separated, you should be able to see the CPU fan.

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Image 1/3: Only one screw is shown being removed. Image 2/3: Gently remove the fan's power supply by pulling up on the small white connector (with orange and red wires). Image 3/3: Avoid pulling on the wires while removing the power supply, as this will cause permanent damage.
  • Remove the two 3.0 mm screws on each side of the fan using the Phillips #0 screwdriver.

  • Only one screw is shown being removed.

  • Gently remove the fan's power supply by pulling up on the small white connector (with orange and red wires).

  • Avoid pulling on the wires while removing the power supply, as this will cause permanent damage.

  • Slowly lift up and slide out the fan from the CPU (heat sink) and back of the laptop.

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Conclusion

To reassemble your device after replacing the fan, follow these instructions in reverse order.

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Ryan Bortnick

Member since: 03/20/2017

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