Hi everyone,
I am trying to learn electronics repair. I purchased a “faulty for spares/repairs” ASUS X99-PRO/ USB 3.1 motherboard for a very low price from ebay – a good enough price to offset the high probability that the board was completely toast and not realistically repairable.
Initial results:
Board would power-cycle when turned on either with switch on board or shorting pwr pins. Fan would spin for a second or so and a QCODE of 00 would display then it would power off and then do the same thing again over and over. I think maybe 2 times in about 100 attempts at powering on it got past the power cycle. When it did this it still did not post to bios (UEFI) and many different, constantly changing QCODES were displayed. In either case no signal was displayed on the monitor.
1: Tried removing RAM sticks, gpu and even cpu but would not get past power-cycling and 00 code.
2: Board has ASUS flashback facility. Downloaded the most recent BIOS from ASUS (version 4101), copied to USB and connected USB to the dedicated flashback USB port and pressed flashback button – seemed to be doing something but not sure if it actually flashed the BIOS. Net result still power-cycling with 00 code.
3: Removed BIOS chip from motherboard and programmed latest BIOS (4101) on to the chip with a CH341a USB BIOS programmer and Neoprogrammer software.
PROGRESS!! But not completely fixed. Need advice/help.
Motherboard will POST into BIOS (UEFI) but ONLY after it has been completely powered down (PSU switched OFF) for a considerable time interval (gonna say 5 minutes but haven't really started timing it too closely).
Some other things to note (not sure if relevant).
The CMOS battery was reading 2.9v both in and out of circuit. Thought this was slightly low so changed it for a new one. No change.
I was initially using a Corsair CX550F RGB power supply. I tried a different psu, OCZ500MXSP, and the board posted more reliably with this despite being an old psu and less power.
If the board is “reset” from within BIOS(UEFI) it will quite happily POST without any problems time after time.
Even after the board has been running in UEFI, if it is shut down with the power button (rather than a reset) and you try to restart from the power button (or short pwr pins) the board will revert to power-cycling and 00 QCODE until it has been completely removed from power for a period of time.
Feel like I am nearly there with this. Would be grateful for any advice/help/suggestions please.
Thanks in advance,
Jim
I am trying to learn electronics repair. I purchased a “faulty for spares/repairs” ASUS X99-PRO/ USB 3.1 motherboard for a very low price from ebay – a good enough price to offset the high probability that the board was completely toast and not realistically repairable.
Initial results:
Board would power-cycle when turned on either with switch on board or shorting pwr pins. Fan would spin for a second or so and a QCODE of 00 would display then it would power off and then do the same thing again over and over. I think maybe 2 times in about 100 attempts at powering on it got past the power cycle. When it did this it still did not post to bios (UEFI) and many different, constantly changing QCODES were displayed. In either case no signal was displayed on the monitor.
1: Tried removing RAM sticks, gpu and even cpu but would not get past power-cycling and 00 code.
2: Board has ASUS flashback facility. Downloaded the most recent BIOS from ASUS (version 4101), copied to USB and connected USB to the dedicated flashback USB port and pressed flashback button – seemed to be doing something but not sure if it actually flashed the BIOS. Net result still power-cycling with 00 code.
3: Removed BIOS chip from motherboard and programmed latest BIOS (4101) on to the chip with a CH341a USB BIOS programmer and Neoprogrammer software.
PROGRESS!! But not completely fixed. Need advice/help.
Motherboard will POST into BIOS (UEFI) but ONLY after it has been completely powered down (PSU switched OFF) for a considerable time interval (gonna say 5 minutes but haven't really started timing it too closely).
Some other things to note (not sure if relevant).
The CMOS battery was reading 2.9v both in and out of circuit. Thought this was slightly low so changed it for a new one. No change.
I was initially using a Corsair CX550F RGB power supply. I tried a different psu, OCZ500MXSP, and the board posted more reliably with this despite being an old psu and less power.
If the board is “reset” from within BIOS(UEFI) it will quite happily POST without any problems time after time.
Even after the board has been running in UEFI, if it is shut down with the power button (rather than a reset) and you try to restart from the power button (or short pwr pins) the board will revert to power-cycling and 00 QCODE until it has been completely removed from power for a period of time.
Feel like I am nearly there with this. Would be grateful for any advice/help/suggestions please.
Thanks in advance,
Jim
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