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my bios loss the configuration
hello... my computer loss the bios information... i has changed the
battery and then reconfigured the bios data, time, etc... but when i unplug the computer of the electric cable loss the bios configuration... and i do not know way this do and how to solve... The bios it's the latest beta version of the support web of my motherboard ASUSP5GD2-X Maybe can be because it's a beta version? Now I has unplugged the frontal case usb because one runs right and the other do not detect the things plugged... but the light appears... and I thing this can be thing that consume the battery energy... I don't know... Thank's !!! |
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my bios loss the configuration
Esteve Valentí wrote:
hello... my computer loss the bios information... i has changed the battery and then reconfigured the bios data, time, etc... but when i unplug the computer of the electric cable loss the bios configuration... and i do not know way this do and how to solve... The bios it's the latest beta version of the support web of my motherboard ASUSP5GD2-X Maybe can be because it's a beta version? Now I has unplugged the frontal case usb because one runs right and the other do not detect the things plugged... but the light appears... and I thing this can be thing that consume the battery energy... I don't know... Thank's !!! The CMOS battery is not connected to the USB ports. The USB port, and any LED on a peripheral device, run from +5V or +5VSB. Your motherboard has a hardware problem. The power from the battery is not reaching the Southbridge (which holds the 256 byte CMOS RAM and RTC clock). Have you ever used the jumper to "clear the CMOS" ? It could be, that you used that jumper, while the computer still had power inside the chassis. And that damaged a diode in the battery circuit. This picture, is your motherboard, with the "AI Proactive" heatsink removed from the Southbridge chip. You can see some components near the CMOS jumper. I'd be visually examining the components there, for damage. In the past, Asus motherboards used a dual diode, with common cathode, in the battery circuit. It has "K45" printed on it, but you'd need a magnifying glass to read it. I can't see it in the picture, but if it is in the circuit, it would be in the bottom right of this photo. The thing has three legs, a black body, and "K45" printed on it, and it could be burned or damaged. http://www.ibora.net/html/contants/p..._p5gd2_x_4.jpg To see the part of the circuit that is damaged, see PDF page 76 here. The two Schottky diodes, are inside the same three legged package. The lower diode is "open circuit". To trace it, you could start from the battery, using a multimeter, to find the 1Kohm surface mount resistor, then trace from the other side of the resistor, to some three legged part which is broken. This is not easy to do, and takes time. You would replace the dual diode, with a new one. http://www.intel.com/Assets/PDF/datasheet/301473.pdf And this is what a replacement diode would look like. I have three Asus motherboards using this particular part for the task. It is always possible they could use a different one than this, but this one is popular. ( BAS40W-05, on page 2 it says "K45 = BAS40W-05" ) http://www.diodes.com/datasheets/ds30114.pdf Paul |
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