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07-29-2021, 02:46 AM
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#1 |
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Oldbie
Join Date: Jun 2006
City & State: Melbourne, Victoria
My Country: Australia
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Asus P8Z68-V/Gen3, after saving UEFI settings, shuts down, doesn't restart
I've tried all BIOSes available to download, most recently first release version 0301, using an i3-2100
For each try, after externally reprogramming its Winbond 25Q64BV (DIP8) with TL866IIplus Always same outcome - after Save & Exit, board shuts down and doesn't restart If I press onboard Power button, it'll start up then shut down again After jumpering CMOS Clear, it'll start to UEFI settings then repeat same behaviour It's had a new CR2032 fitted Closer examination found a second flash IC, a soldered Pm25LD512 (SOP8 or SOIC8, whichever is smaller), just to left of SATA connectors block (25Q64BV is on right) In these days of Management Engine and multi-MB firmware, something 64KB seemed too small to be relevant, but having run out of ideas, I desoldered it to see what would happen After power on, board contemplates for a few seconds, flashes a couple of red LEDs, bleeps with a brief glimpse of Asus logo, messages "The data in the EC or EC flash might be corrupted", then shuts down Dump of Pm25LD512 is attached - BIOSes tried are the *.ROMs downloaded from Asus Could anyone advise/assist please
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better to keep quiet and be thought a fool, than to open your mouth and remove all doubt |
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07-29-2021, 01:18 PM
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#2 |
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Super Moderator
Join Date: Jan 2018
City & State: York
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Re: Asus P8Z68-V/Gen3, after saving UEFI settings, shuts down, doesn't restart
Its the EPU firmware.I checked it against one extracted from the asus bios and its exactly the same.Flash it back and carry on troubleshooting .
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07-29-2021, 07:19 PM
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#3 | |
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Oldbie
Join Date: Jun 2006
City & State: Melbourne, Victoria
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Re: Asus P8Z68-V/Gen3, after saving UEFI settings, shuts down, doesn't restart
Quote:
Unfortunately I've run out of ideas, so scrapping the P.O.S. is looking like the most feasible option If EPU firmware is in the BIOS, I can't understand why there'd be a second, dedicated, flash IC just for it Maybe the Pm25LD512 is acting as a scratch pad and getting rewritten every boot, so replacing it perhaps worth a try  |
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07-30-2021, 04:46 PM
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#4 |
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Super Moderator
Join Date: Jan 2018
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Re: Asus P8Z68-V/Gen3, after saving UEFI settings, shuts down, doesn't restart
Do you have a POST card
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07-30-2021, 08:35 PM
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#5 |
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Badcaps Veteran
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Re: Asus P8Z68-V/Gen3, after saving UEFI settings, shuts down, doesn't restart
Is "EC" for "embedded controller"? (Is it the same thing as "KBC" on a laptop?) (even when an ATX motherboard?)
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08-02-2021, 06:47 PM
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#6 | |
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Oldbie
Join Date: Jun 2006
City & State: Melbourne, Victoria
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Re: Asus P8Z68-V/Gen3, after saving UEFI settings, shuts down, doesn't restart
Quote:
After powering-on motherboard once it's failed to restart, the POST card shows something like "finding type of keyboard and setting Numlock status" before losing power again |
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