Introduction

If nothing is working at all on your calculator and nothing you have tried has worked, you may need to replace the motherboard. If the screen is cracked or damaged, you will need to replace it. This guide will show you how to replace both the motherboard and the screen, because they are attached and cannot be easily separated.

Insert your index finger in the open slot below the keys.
  • Insert your index finger in the open slot below the keys.

  • Be careful to not bend the plate too much because it is very thin and might break.

  • Apply a firm upward force until the bottom two tabs located near the bottom of the plate come off.

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Grab the face plate on each side near the middle and apply a gentle upward force on each side until the middle tabs come off.
  • Grab the face plate on each side near the middle and apply a gentle upward force on each side until the middle tabs come off.

  • A tab is located in the center of the face plate. If it is still attached, then continue to apply a gentle upward force until the center tab comes off.

  • Lift the face plate upward until the top three tabs come off and the face plate is completely detached.

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Push firmly down on the tab located on the back of the calculator near the center. Pull the tab up, lifting it off of the calculator and exposing the batteries. Pull the tab up, lifting it off of the calculator and exposing the batteries.
  • Push firmly down on the tab located on the back of the calculator near the center.

  • Pull the tab up, lifting it off of the calculator and exposing the batteries.

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Push from the positive side to the negative side and pull up to remove each battery.
  • Push from the positive side to the negative side and pull up to remove each battery.

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Using the Phillips #00 Screwdriver, unscrew the 15 mm screw holding the backup battery cover, located above the main battery area.
  • Using the Phillips #00 Screwdriver, unscrew the 15 mm screw holding the backup battery cover, located above the main battery area.

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Grab the plate and lift gently upward, to remove the backup battery cover.
  • Grab the plate and lift gently upward, to remove the backup battery cover.

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Wedge the small plastic opening tool under the backup battery in the gap to the left of the backup battery. Push gently downward until the backup battery pops out.
  • Wedge the small plastic opening tool under the backup battery in the gap to the left of the backup battery.

  • Push gently downward until the backup battery pops out.

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Unscrew the six 8.5 mm screws located on the perimeter of the back cover using the Precision T6 Torx Screwdriver. Unscrew the six 8.5 mm screws located on the perimeter of the back cover using the Precision T6 Torx Screwdriver.
  • Unscrew the six 8.5 mm screws located on the perimeter of the back cover using the Precision T6 Torx Screwdriver.

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Wedge the large plastic opening tool in the gap at the bottom between the top and bottom covers. Apply a gentle downward force to separate the top cover from the bottom cover. Wedge the large plastic opening tool in the gaps along each side to unhook the side clips.
  • Wedge the large plastic opening tool in the gap at the bottom between the top and bottom covers.

  • Apply a gentle downward force to separate the top cover from the bottom cover.

  • Wedge the large plastic opening tool in the gaps along each side to unhook the side clips.

  • There are clips located at the bottom of the calculator, on the sides of the calculator (both near the bottom and near the top), and at the top of the calculator.

  • Pull the bottom cover apart from the top cover.

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Unscrew the two 5 mm screws at the bottom of the silver sheet using the Phillips #00 Screwdriver. Pull up on the silver sheet from the top to remove it from the calculator.
  • Unscrew the two 5 mm screws at the bottom of the silver sheet using the Phillips #00 Screwdriver.

  • Pull up on the silver sheet from the top to remove it from the calculator.

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Unscrew the four 5 mm screws on the sides of the mother board Phillips #00 Screwdriver. Pry the motherboard out from the bottom of the front casing using the large plastic opening tool.
  • Unscrew the four 5 mm screws on the sides of the mother board Phillips #00 Screwdriver.

  • Pry the motherboard out from the bottom of the front casing using the large plastic opening tool.

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Conclusion

To reassemble your device, follow these instructions in reverse order.

21 other people completed this guide.

Kale McKinney

Member since: 10/20/2013

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Cal Poly, Team 11-34, Amido Fall 2013 Member of Cal Poly, Team 11-34, Amido Fall 2013

CPSU-AMIDO-F13S11G34

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4 Comments

Where can I buy the screen/motherboard?

Tim van Steen - Reply

Did you find out where to purchase the screen/motherboard? Having trouble finding it online.

Thanks.

Jacqueline Kennedy -

any update on where to fin a motherboard/screen? i found a youtube video which showed how to replace the screen flex, by soldering on new wires, and have read that the only way to get parts is from another calculator, can anyone confirm this?

https://www.youtube.com/watch?v=aIlR0Lpe...

Connor Murphy - Reply

Yeah - I can't find one to buy either. Your instructions look great though.

juxtapaused - Reply

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