Motherboard connects to power supply, keep on(fan spin) forever?Repair a proprietary motherboard
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Posted by on March 12, 2007, 5:03 pm
Please log in for more thread options When i connect the power supply to motherboard, the motherboard turn on right away(fan spin) without pressing the power-on button. And there're nothing shown on the screen. . I clear the cmos, reseat, replace the ram and CPU ;and it's still the same. The moterboard uses ATX power , but layout is proprietary(lay out is completely different from the normal ATX) and it is impossible even to obtain a used one. Can anyone give me a hint on what parts of component should i start probing? | |||||||||||||
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Posted by kony on March 13, 2007, 2:01 am
Please log in for more thread options >I have a properitary ATX motherboard, but the board is dead.
Since it is proprietary, it could be all that much more important to tell us as much as possible about it. >When i connect the power supply to motherboard, the motherboard turn
>on right away(fan spin) without pressing the power-on button. And >there're nothing shown on the screen. . Don't connect the power supply to the motherboard while the power supply is already connected to AC. Are you sure you are able to work with this system safely if you aren't keeping it unpowered until reconnected, or am I misunderstanding what you wrote? Some motherboards will do this without it being a sign of a problem, particularly if the board bios was set to (or defaults to) last powe state, meaning that it remembers it was turned on and will turn itself back on deliberately until turned off properly. You should ignore that it's doing this for the time being but unplug AC and clear CMOS at this point (or pull battery for 10 minutes, also while AC power is disconnected from PSU). You might also try the reset button, or if this proprietary system has none, locate the reset pins on the motherboard. What is the history of the system? How long had it ran without issues, what was the suspected cause of failure, how long since it has ran? Do you know for certain that any or all other parts are working still? Check the battery voltage, a low battery can cause this without any other problems, depending on how the board was designed. >
>I clear the cmos, reseat, replace the ram and CPU ;and it's still the >same. So are you sure all these other parts work? Were they the same parts that were previously working in this board, and you have taken them out and tried them in another system to confirm they still work? Playing odds (no guarantees), unless there was overt physical damage or a fan failure, it's usually the motherboard or PSU that fails first. >
>The moterboard uses ATX power , but layout is proprietary(lay out is >completely different from the normal ATX) and it is impossible even to >obtain a used one. > >Can anyone give me a hint on what parts of component should i start >probing? Disconnect the PSU and check the voltages while powered by shorting the PS-On pin to ground. If it won't run like that it may need a load on 5V rail, maybe 12V rail and occasionally 3.3V rail too. Examine the board for obvious signs of problems like discolored copper (overheating), flux seeping out around mosets, burn holes in chips, cracks, and especially capacitors venting/leaking/etc. We don't know much at all about this system yet, except that it's ATX. | |||||||||||||
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Posted by Bob F on March 14, 2007, 2:51 am
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> I have a properitary ATX motherboard, but the board is dead.
> When i connect the power supply to motherboard, the motherboard turn > on right away(fan spin) without pressing the power-on button. And > there're nothing shown on the screen. . > > I clear the cmos, reseat, replace the ram and CPU ;and it's still the > same. > > The moterboard uses ATX power , but layout is proprietary(lay out is > completely different from the normal ATX) and it is impossible even to > obtain a used one. > > Can anyone give me a hint on what parts of component should i start > probing? > Proprietary motherboards often used proprietary power supplys. The power wiring is different. Are you using the right supply? Bob | |||||||||||||
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Posted by fred64 on March 29, 2007, 7:03 pm
Please log in for more thread options Typical corrupt BIOS behaviour
Get your CMOS chip reflashed and all should be well See Ebay for service providers See Wims Bios site for info on recovery regards | |||||||||||||
