Dreamcast CMOS Battery Replacement

Member-Contributed Guide

Member-Contributed Guide

An awesome member of our community made this guide. It is not managed by iFixit staff.

Dreamcast clock always having to be reset? Time to replace your CMOS

When a Dreamcast ask for time and date every time you power on your system, your CMOS battery is dead. This guide shows how to replace the CMOS battery.

Edit Step 1 Top Cover  ¶ 

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Edit Step 1 Top Cover  ¶ 

  • Locate and remove all four black 12mm Phillips #02 screws from the underside of the console.

  • The fourth screw is hidden under the expansion bay if it has not already been removed.

Edit Step 2  ¶ 

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Edit Step 2  ¶ 

  • Be careful that the internal components do not topple out.

  • Flip the console topside up.

  • Remove the top cover of the chassis by gently lifting the upper portion of the console.

Edit Step 3 Controller Port  ¶ 

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Edit Step 3 Controller Port  ¶ 

  • Be gentle with the white controller cable as it can be a bit fragile.

  • Disconnect the white controller cable by gently pulling the the cable while wiggling it back and forth until it detaches from the controller board.

Edit Step 4  ¶ 

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Edit Step 4  ¶ 

  • Remove the four 14mm Philips #02 located on the controller board.

Edit Step 5  ¶ 

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Edit Step 5  ¶ 

  • Disconnect the white fan header from the controller port

Edit Step 6  ¶ 

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Edit Step 6  ¶ 

  • Remove the controller board by lifting it up from the controller port.

Edit Step 7 CMOS Battery  ¶ 

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Edit Step 7 CMOS Battery  ¶ 

  • De-solder the old CMOS battery from the controller board.

  • Note where the positive and negative terminals went.

Edit Step 8  ¶ 

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Edit Step 8  ¶ 

  • Solder the new battery holder to some wire

  • solder those wires to corresponding points on the controller board. Take note where the Positive and negative terminals went

Edit Step 9  ¶ 

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Edit Step 9  ¶ 

  • Reinsert the controller board.

  • attach the battery holder inside with some self adhesive, such as double sided foam tape

  • insert the battery into the battery holder

  • reverse the disassembly directions to reassemble your Dreamcast.

  • Once your Dreamcast is reassembled, go ahead and connect the Dreamcast to you TV or monitor and power, and reset the clock.

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

For more information, check out the Sega Dreamcast device page.

Required Tools

Phillips #2 Screwdriver

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Digital Multimeter

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Soldering Workstation

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Safety Glasses

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Comments Comments are onturn off

For the step 7, you can get the cmos holder like this from ebay. This holder is perfect fit for the dreamcast controller board and easily replace the cmos battery if it drains out again.

leat, · Reply

Just as a heads up, the coin cell that was pictured in this guide (a CR2025 from what I can see) is not rechargeable. The stock battery is an ML2430, so a suitable replacement of about the same size as a CR2025 would be cells with the code ML20XX (ML2020, ML2025, ML2032).

Elanna, · Reply

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