Did you ever turn on your Dreamcast and get this screen?
Odds are the CMOS battery in your Dreamcast is dead.
Tools you will need:
Wire cutters and wire strippers
Safety Glasses/ eye protection
CR2025 battery cell holder
CR2025 coin cell battery
Doubled Side foam mounting tape
Optional: Electric tape or shrink wrap
WARRING: Although this is a simple mod, you are going to be working with a hot soldering iron around a battery Wear Safety glasses/ Goggles or other form of eye protection, and do not keep the hot soldering iron too long on the battery.
You can substitute the CR 2025 with a similar 3 volt coin cell or 2 more standard batteries like AA that will at up to 3 volts (1.5 volts each). Use only rechargeable batteries, DO NOT USE Alkaline batteries please.
Reason I want to use a battery holder instead of soldering on battery cell is because, if I have to repeat this process in the future, I want to save as much work as possible. This way I do not have to solder directly to the battery. Also exposing a battery, charged or dead to excessive heat is not advisable.
Flip your Dreamcast upside down.
Remove the modem from your Dreamcast
Remove the 4 Screws holding your Dreamcast shut.
Flip back over and remove the top of the system’s case.
Once you have the top of your system case off, locate the circuit board that has the CMOS battery.
5a. (optional) If you have a multimeter or other volt tester you can test the battery to see if it is dead or not.
Locate 4 brass screws on this circuit board, it should be near the controller ports, remove them.
Then carefully remove the ribbon cable by pulling upwards .
Carefully remove the 3 pin connector going to the Fan to the Right
This pic was made post op
- unsolder the 3 pins holding the battery to the board.
Best way to go about this is flip the board over and de-solder the 3 pins holding the battery in place
I removed some solder with a de-soldering wick, then push down on each pin with my iron. At no time should the soldering iron touch the actual cell.
Dispose of the old battery according to your local laws concerning battery disposal.
- solder in 2 wires on the PCB for the new battery holder, keep in mind which spots on the board the plus and minus terminals went. The Plus side is labeled on the board.
10a. if required solder the wires to the appropriate terminals to the battery holder
Also take a note which terminal is positive and negative.
You should not have installed the battery into the battery holder until all the soldering in this project is DONE.
New CR2025 battery and CR2025 battery holder.
Now the hard part is done
replace back in the circuit board back into the Dreamcast
Reattach the ribbon cable and fan connector
attach the battery holder to the inside using a self adhesive, like double-sided foam mounting tape, self adhesive velcro would work here too. Now you can place in the battery into it’s holder.
Replace the top cover of the Dreamcast and replace the 4 case screws
Put back the modem
Hook up your Dreamcast to your TV or Monitor and reset the time & date
And yes this is almost identical to the Instrucible also written by me.
I am Head Wound on Instructibles
Repairing a Dreamcast Time/ Date