Early Prototype Mother Board Pics

[xman]

Found these and thought some of you may be quite interested especially the battery install instead of the short endurance supa cap for long term time feature backup supply



I want a battery backup and can't see why I couldn't use the batteries I use in my clocks to supply the mother board's clock requirements as well. Testing underway.

[AZImmortal]

Do you hardmod? If you do, then I've found it easiest to just let XBMC set the time via NTP (assuming your Xboxes are connected to the internet). I don't bother replacing the caps.

[xman]

Do you hardmod?

Is the Pope a Catholic?.

If you do, then I've found it easiest to just let XBMC set the time via NTP (assuming your Xboxes are connected to the internet). I don't bother replacing the caps.

Well that is very true but I have machines that aren't always connected to the net so the time isn't correct.

[Nextelhalo]

Backup battery FTW!!!!! I didnt even know these boards were made, thanks for sharing this Xman.

[professor_jonny]

i read somewhere the plug at the back included a jtag bus and temp sensor output and sm bus connector.

id never seen pictures of it shame they all did not have batterys like this one.

[xman]

I thought you would have already had this one tested for us PJ?. Simple, run the machine for a while, rip the board out and measure the voltage on the charged cap, ( I'm thinking it's going to be 3vDC there abouts), however the meter will tell all. You may wish to check the voltage the caps sees when it's in circuit and machine is powered up and this I would suspect will be up to a volt higher although 3.3VDC is all that would be required. Any higher will simply be absorbed by the 3 volt button cell and try to recharge it even if it isn't a rechargeable battery. This is what I'm expecting to see on my test machine however, I don't have a 1.0 machine, only 1.2-1.6 machines. I'd also be using 2 X AA batteries rather than a 3 volt button cell with the red from the battery pak to the old caps + location and the = to the old caps - location. Even if it doesn't work, it shouldn't damage the mother board but hay, if you see smoke and fire, let us know aye. Just thinking about it, it may be wise to put a 1k 1/2 watt resistor in line with the battery at first, "just in case". I would suspect the current draw to be minimal from the battery but this resistor will protect the circuit just in case and drop no voltage, just excess current.

[MrMajst3r]

Here is nice tutorial (but unfortunately in German) how to replace old cap with 3V battery + new cap:
http://circuit-board.de/forum/viewtopic.php?f=54&t=2174

Btw, interesting photos

[psychotron]

@MrMajst3r...

That is awesome. You can get the just of this from the pictures and I think I may need to give this a try for my car xbox

I would have thought the cap would not be needed. A little difficult to understand why he put in a cap as the battery should do the job fine?? The diode makes perfect sence to keep the xbox from charging the lithium when it is powered... it also makes a nice 0.7V drop from the 3V into the time circuit.

Thanks all for the great ideas ALL:)

[professor_jonny]

I thought you would have already had this one tested for us PJ?. Simple, run the machine for a while, rip the board out and measure the voltage on the charged cap, ( I'm thinking it's going to be 3vDC there abouts), however the meter will tell all. You may wish to check the voltage the caps sees when it's in circuit and machine is powered up and this I would suspect will be up to a volt higher although 3.3VDC is all that would be required. Any higher will simply be absorbed by the 3 volt button cell and try to recharge it even if it isn't a rechargeable battery. This is what I'm expecting to see on my test machine however, I don't have a 1.0 machine, only 1.2-1.6 machines. I'd also be using 2 X AA batteries rather than a 3 volt button cell with the red from the battery pak to the old caps + location and the = to the old caps - location. Even if it doesn't work, it shouldn't damage the mother board but hay, if you see smoke and fire, let us know aye. Just thinking about it, it may be wise to put a 1k 1/2 watt resistor in line with the battery at first, "just in case". I would suspect the current draw to be minimal from the battery but this resistor will protect the circuit just in case and drop no voltage, just excess current.

I have seen what happens when you try to charge a coin cell they make a nice bang i'd put a diode in series in there for safety maybe use 5 and put 2 batterys in series and put as the volt drop across the diode will make the voltage prity close.
3-.7 =2.3v

3+3=6
6-(5*.7)= 2.5v

i have seen tutiorals around before.

edit : shuld scroll down futher doh!!