Just another fresh experience from today. Gigabyte Z690 Aorus Elite DDR4 - symptoms very similar to yours: board starts only randomly correctly (however started always, but usually no boot, CPU LED lit and not progressing), once started shuts down randomly within seconds to minutes. Starting again only randomly again. Board is ca. 1 year old.
The reason was very strange, a partially broken linear regulator (AP7365-WG-7) supposed to supply a fixed 3.3V VCC voltage for the main PWM controller RAA229131 (CPU VRM controller). Sometime it delivered the 3,3V as desired, but randomly the voltage...
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Would guess some cold solder point or a cap on the edge of failing (random but recovering shorts). Quite difficult to trace. Could try to use freezing spray or heating areas to trace. Try bending the board to confirm/rule out a mechanical issue - bad solder point. Can also be the chipset partially defect or end of life, issue with RAM or maybe PSU, bad contacting of RAM modules or CPU. Mosfet issue - very unprobable, they usually work or fail completely (short), parts which can fail to some extent are any kind of caps, resistors (especially low ohm smd resistors 0 up to 50 ohms under relatively...Last edited by DynaxSC; 07-21-2024, 07:18 PM.
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With MSI you are probably lucky, as they usually have a jumper named J1 somewhere in neighbourhood if the cpu vrm chip. If there is one just short it and power the board without CPU and ram. Check if there is ca 1V on VCORE. If yes, the controller and whole vrm with mosfets etc is OK. If not, there is some issue in the VRM network. Usually it is not the controller, but some issue with mosfets, low ohm resistors or drivers if present. If the VRM is OK then there is an issue somewhere else, eg. broken bios, some issue in the power sequence logic, missing parts, broken tracks, faulty or partially...Last edited by DynaxSC; 07-18-2024, 07:15 PM.
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It won't be the voltages, they are same for both DIMM slots (connected in parallel). Check first the cpu socket for bent or dirty pins, then also the DIMM socket itself. You can try to clean the cpu and DIMM sockets with isopropyl alcohol (must be 99.9% clean) and some soft brush. For the cpu socket do it very carefully, slide the brush in direction of the pins, never against. After brushing best is to dry the sockets with compressed air. Look with a magnifier glass for any foreign objects in the sockets. Clean also the cpu pads and the memory pads. If this does not help, then probably the connections...Last edited by DynaxSC; 07-18-2024, 06:38 PM.
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R2627 - that can be normal.
R2693 is strange, but sometimes can happen if a mosfet is switched on, mosfets have some gate memory and sometimes it takes some time they switch off, even unpowered. They behave a little like ordinary switches and the "on" resistance is very low (miliohms). U may look if there is a voltage on the resistor when card is powered.
Sometimes changing the probes when measuring in-circuit can give different results (polarity dependencies).
I suggest before u go on with repair, that u read as much as possible other posts about GPU repair,...Last edited by DynaxSC; 06-25-2024, 07:16 PM.
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I would not see a lot what can be done. Try another m.2 port - usually only one m.2 port on a mobo supports SATA mode. Try usb adapter for m.2 disk.
Always do backups for important data, and don't buy nonames/chinese disks they are usually crap.Last edited by DynaxSC; 06-24-2024, 08:14 PM.
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First get a boardview of the card and measure all main voltages when card is powered and in non-operating mode. Check is any voltage is missing then.
Might be some electrolytic cap failing, they are able to recover sometimes. Could be also any other device failing and recovering. Unfortunately this kind of failure is the most difficult one to trace. U might try using a freezing spray on working and powered card to narrow down the area, but this must not necessarilly work. Heating an area with hot air is also an option, but temperature must be reasonalble, especially for electrolytic caps....Last edited by DynaxSC; 06-22-2024, 07:32 PM.
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Additionally u can remove all mosfets in the burning section (both HiSide+LowSide if there is no doubling, and 2 x HiSide+LowSide if phase doubling is used) and start the board w/o CPU as anikin73 wrote. Then look with a scope what happens on the gates of the mosfets, and/or the phase outputs of the VRM/Driver/Doubler. The board might work even without one phase if CPU voltages are correctly present, also if u insert the CPU (but I strongly do not recommend to do this).
Also a faulty VRM/Driver/Doubler can have have different resistances on the phase outpus/inputs (eg. some internal...Last edited by DynaxSC; 06-21-2024, 07:02 AM.
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ASUS PRIME Z690-P - "Motherboard Impossible"
Today I received an allegedly broken ASUS PRIME Z690-P DDR4 motherboard.
The seller of the board has written the board sometimes starts, sometime not, and it is not stable, crashes sometimies during operation in Windows.
I powered the board, and it went straight to the BIOS screen, showing BIOS version 0407.
After first next reset the board surprisingly went directly into BIOS update screen and started without asking a BIOS update and it correctly updated the BIOS to version 1620 !
There was no pendrive with an image attached to the board, only...
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[SIZE=20px]Hi, I just made an completely astonishing discovery 😀![/SIZE]
The TL631 works on LGA1700 Gigabyte and ASUS boards the following way:
[B]Gigabyte:[/B][LIST][*]the TL631 must be inserted into the las PCIe slot (farest from CPU) - using the short PCIe connector[/LIST]
[B]ASUS:[/B][LIST][*]the TL631 must be inserted into the 5 pin com debug port as on the picture below - using the bigger LPC2 connector (pin 1 into pin 1):[/LIST][URL=filedata/fetch?id=3294241&d=1718925285][ATTACH=JSON]{"alt":"Click image for larger version Name:\t20240621_010400.jpg...Last edited by DynaxSC; 06-20-2024, 05:41 PM.
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Thank you for the information. However the issue is more complicated. I know how to transfer the "personalisation data" into a stock Bios, thats not the issue. The problem is, that the mobo with a factory new chipset, and a stock Bios does not boot correctly, it hangs somewhere after the DRAM LED went off. And it does not matter if the Bios is personalized or not. Beside FD44 I even used Intels Flash Image Tool (fit.exe) to impor the stock Bios image and edit the parameters with fit to enable "Software Binding" of PCH with the Bios. The issue is that ASUS had done something...Last edited by DynaxSC; 06-19-2024, 06:41 PM.
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Have no experience with these AMD GPU's. Resistors on mobos are usually black on top, caps not black, but bright colors. But this is a GPU, might be different, I would however expect majority of caps. To go sure take off device, and measure it w. DMM. Better than taking off is only sliding one end to disconnect from the pad, and leaving the other end soldered on the pad. That way the tiny device has low chance to get lost, and it is easier to measure it, as it is somewhat fixed. As this are most probably decoupling caps, they should have quite high capacities, eg. 0,1 - 10 uF. Most DMM's can measure...Last edited by DynaxSC; 06-15-2024, 06:55 PM.
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If you are brave enough, here another good download source on an russian site:
[URL]https://xeon-e5450.ru/soft/intel-me-system-tools/[/URL]
[URL=filedata/fetch?id=3291208&d=1718485188][ATTACH=JSON]{"alt":"Click image for larger version Name:\tobraz.png Views:\t0 Size:\t460.8 KB ID:\t3291208","data-align":"none","data-attachmentid":"3291208","data-size":"custom","height":"262","title":"obraz.png","width":"276"}[/ATTACH][/URL]...Last edited by DynaxSC; 06-15-2024, 03:34 PM.
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There is no source of such information, only way is get another donor device, best demaged, and transplant the devices. Also measuring in-circuit is to 99% not possible.Last edited by DynaxSC; 06-14-2024, 06:08 PM.
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Simple answer is NO. These devices are so small, that they will stick to the solder iron due to the superficial tension of the tin and solder liquid. Only hot air, but this is some risk, that the GPU will be demaged or u blow off more of these devices.Last edited by DynaxSC; 06-14-2024, 06:03 PM.
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TL611 / TL631 debug cards not working on Z490 i higher chipset boards ?
I have both of these chinese made debug cards, but they seem to work only on the Z390 family and older chipsets.
Does anybody know whats the reason for this ?
Are there any other debug cards out there working on Z490 - Z790 chipset families ?
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Need real mobo dump of BIOS v402 for ASUS PRIME Z590-A - stock image no help
Hi,
I have a serious problem to program the Z590 chipset SRAM with a Management Engine after replacing the chipset.
The new chipset is factory new and is not containing any Management Engine. Any attempts to program it into the chipset under Windows ends with a failure (eg. Error 20: Management Engine Device not present, or something similar).
Due to the lack of the ME several ports on the board, including all M.2 ports aren't working, booting OS works only on USB. So it's now other way, as to program the chipset with a ME.
Usually on ASUS boards it worked...Last edited by DynaxSC; 06-14-2024, 03:53 PM.
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Hi stj,
Could you describe in a few words how you do this with ME_Cleaner ?...
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