I have a V1.0 mobo that i tsop'd maybe 2 years ago and gave to my brother but he never used it , i assemble it into a machine and now it powers on as soon as you plug the power cable in.
I'm sure i have read of this problem before but cant find the post relating to it.
Xbox mobo issue
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bigkidoz
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Re: Xbox mobo issue
Traces are fine but looks like the clock cap has been leaking, might just remove the cap and if it doesnt fix it i will remove the ram.
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AZImmortal
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Re: Xbox mobo issue
Even if the traces look fine, I would try the fix anyway because the only cause for the problem that you're describing that I've ever seen is corroded traces. There's a small chance that the problem could be the power/eject board, so you can try disconnecting that and then plugging in the power. If the Xbox still turns on, then I'm 99% sure that it's corroded traces. You should still remove the clock cap and clean up any leakage though.
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bigkidoz
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Re: Xbox mobo issue
Not the PE board as that is the first thing i checked as well as the PSU, i looked along all the traces under a magnifying lens and cant find any corroded traces.AZImmortal wrote:Even if the traces look fine, I would try the fix anyway because the only cause for the problem that you're describing that I've ever seen is corroded traces. There's a small chance that the problem could be the power/eject board, so you can try disconnecting that and then plugging in the power. If the Xbox still turns on, then I'm 99% sure that it's corroded traces. You should still remove the clock cap and clean up any leakage though.
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professor_jonny
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Re: Xbox mobo issue
I have had an xbox where one of the 4 resistors at the front where you solder the eject on the motherboard was fried i believe it happened from the wire being crushed in the lid when the xbox.
because there was no pull up it just powered on as soon as you applied mains.
because there was no pull up it just powered on as soon as you applied mains.
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xman
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Re: Xbox mobo issue
I'm finding nothing but trace corrosion as the cause BKO I'm afraid. I have had machines mainly turning on or off by themselves and it has always been this and always right behind the input for the front ports on the right side of the board when the board is up side down. Rather than eyeball the tracks, I meter them because some are minute in size and can be effected by the heat of the board when in use, mainly the turning off by itself issue. Keep looking, you will find it. You may wish to resolder the vias that the traces lead to near the middle of the board just to be safe as well. Putting a bit of heat on the board with the wife's beloved hair dryer may be useful to as that will not only heat up the board but also heat the resistors, pulldowns to ground I think they are configured in that circuit and see if they open circuit. Good luck anyway mate.