Such bahavior suggests issue with completing power sequence, some supply voltage in the sequence is not getting up stopping the process. Possible some vrm chip is dead/shorted, check resistances on all coils and look for shorted ones. CPU should be taked out for this.
Another method is looking for the vrm's if they get ENABLE signal, but do not generate any voltage, however you would need a 2-Channel scope for this, as the time the board is powered is very short.
If no BV available you need to look into the vrm data sheets for ENABLE pin.
DynaxSC
Badcaps Veteran
Last Activity: 06-08-2025, 04:37 PM
Joined: 04-13-2021
Location: Parcela/Mazowieckie
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From my experience 98% PCH is shorted, another 2% the 1v8 vrm is shorted. You can inject 1.8v, but set current limiter to 5 Amps or so, alcohol is a good idea. However if the PCH gets the high current it might short totally to very close to 0 ohms. Then injecting even 10 Amps might not get it warm. More than 10 Amps might be risky as tracks might get melted, making board not repairable.
To go sure PCH is shorted before injecting voltage first remove the vrm coil and see on which side the short is. If possible disconnect only one pad of the coil, and pull up the coil to disconnect.Last edited by DynaxSC; 06-08-2025, 03:44 PM.Leave a comment:
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Probably chipset is degraded, I think 3 ohms is quite low. Don't have much experience with AMD chipsets, but comparing to Intel, 1V power line has min. 25-60 ohms. Further AMD chipsets are much more simple compared to Intel, so theoretically should be much less power hungry and have higher resistances on power supply lines.
The fact that the power voltage is stable says nothing, as the vrms used for chipset power supply usually are an "overkill" and can handle a few Amps current, so 3 ohms is no issue for them (3 ohms mean only 0,33A current at 1V voltage).
...Last edited by DynaxSC; 06-06-2025, 04:39 PM.Leave a comment:
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Thank you very much !Leave a comment:
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Hi Ruslan, Hi all
I have exactly this board (MSI MPG X670E TOMAHAWK WIFI, MS-7E12) with a missing element on the backside of the board.
I'd appreciate is you or anybody could help me with identifying this missing element - the place is shown on below's pictures - it's on the bottom of the board, close to the BIOS Flashback button corner.
The board does not POST probably due to this element missing, and the the MSI X670E CARBON boardview is very different and of no help.
I guess it's a resistor, pls if anybody could measure this resistor (cap) and could...Last edited by DynaxSC; 05-26-2025, 03:42 PM.Leave a comment:
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Check first the data lines, if they are not shorted. USB port should have some small ESD protection devices very close to the USB ports (6-pin), they sometime get shorted by electrostatic discharges, PS/2 might be similar, but I'm not sure. Unfortunatelly these ESD protections not always do their job, so also the USB driver or pch can be shorted internally, depending on what drives the USB ports. In case of pch a repair usually does not make sense, as it is more expensive, than the value of such working old board.
To check you can just desolder the ESD protection devices, and try if this...Last edited by DynaxSC; 05-20-2025, 02:52 PM.Leave a comment:
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Hi, can be any part in the VRM network, a degraded silicon in a driver or vrm controller, a cap at the edge of failing or dryied out, especially electrolytic cap, a resistor which is decalibrated, especially low value resistors, a cold solder point. It will be difficult to diagnose, I'd start with exchanging all the electrolytic caps in the vrm net and checking the low ohm resistors. Also the stability of the vrm controller / driver power supply can be important. Only way is to exchange succesively all parts. Check also the 12V cables and 12V ATX socket if present, might be that the contacts are...Last edited by DynaxSC; 05-20-2025, 02:24 PM.Leave a comment:
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Stubborn GIGABYTE B365M AORUS ELITE - main PCIe x16 GPU port working only in x8 width mode
[SIZE=12px][FONT=Arial]Hi,
I have this board, where I have exchanged the LGA1151 socket. During testing I discovered, that the large PCIEX16 slot won't by no force work in x16 mode, but keeps to work in x8 mode only.
I tested this with GPU-Z, also with Render Test (but tried also Furmark and Heaven Benchmark - no effect).
Tested on Core i5-9600K as well as on an Pentium G5420 and MSI NVIDIA GTX1070 and 2 other cards, including RTX3060Ti.
Board architecture definitely allows x16 mode, as all 16 PCIe lanes are present between CPU and main GPU slot (nearest to CPU)....Last edited by DynaxSC; 05-04-2025, 12:17 PM. -
Hi, as I wrote default settings do not work, also tried several changes in BIOS memory settings, but to no avail. It's also quite difficult to test, as the board does not go into BIOS on Patriot mems, so need to change mems to different make, alter BIOS settings, and then change mems again to Patriots, and finally test. So Gigabyte messed up something in the BIOS, as these Patriot mems are very good mems based on Samsung B-Die chips, and they work in all other motherboards makes I repaired, and these are several hundred by now.
Also my experience with Gigabyte mobo repair is the worst...Last edited by DynaxSC; 04-09-2025, 12:42 AM.Leave a comment:
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ASUS PRIME TRX40-PRO S - component identification
Hi Folks
I have an [B]ASUS PRIME TRX40-PRO S[/B] motherboard with an ripped off smd element, looks like a SOT23-6 case (like a dual 2N7002 mosfet).
Would appreciate a picture with component present or the component marking. Unfortunately no BV/Schematics available anywhere.
Thanks in advance.
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3608292}[/ATTACH]Hi Folks
I have an [B]ASUS PRIME TRX40-PRO S[/B] motherboard with an ripped off smd element,... -
By now I'm almost sure that this is a partially faulty chipset. I have already a replacement one, will report what will be the effect after replacement. I know about the SATA sharing issue, but this is most probably not the reason, as I tried all possible configurations with M.2 port, but there is completely no difference.Leave a comment:
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GIGABYTE GA-H110M-S2 - Stuck at Debug Code C2 - don't like Patriot Viper Steel RAM but works with G.SKILL
[FONT=Tahoma][SIZE=14px][B]Hi,[/B]
I discovered a strange behaviour of GIGABYTE GA-H110M-S2 board.
General test conditions:
- Tested with Core i5 6500 and Core I7 6700K - no difference
- Default BIOS settings, but tried also altering several memory setting - does not change anything
[B]What is wrong:[/B]
With BIOS F1 and F2 the board normally POST's and boots to Windows 11 with 2 x Patriot Viper Steel PVS416G440C9K RAM (4400MHZ, Samsung B-Die chips)
When BIOS upgraded to anything above F2 (ie. F20-F27b) the board POST...Last edited by DynaxSC; 03-21-2025, 07:48 PM. -
GIGABYTE X299 AORUS ULTRA GAMING - SATA PORTS 4-7 NOT WORKING ???
Hi,
I have the above mentioned bord after repair, which was related to a lot of missing smd devices on the back of the board.
There were almost 20 devices missing, caps, resistors and some diodes/mosfets.
The board is generally working now, all PCIe ports are working, Windows installs normally.
However I have a problem with SATA ports 4-7 (the board has 8 SATA ports) - disks are not beeing recognized by the BIOS neither by Windows (which is usually normal in case BIOS does not recognize them).
The SATA 4-7 driver network is quite simple chipset<->buffers/drivers<->SATA...Last edited by DynaxSC; 03-10-2025, 02:24 PM. -
Have you looked at the boardview's I posted, maybe they can be of help for you. Does the vrm controller gets EN signal?Leave a comment:
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On ASUS boards usually its enough to program the first stock BIOS version to enable the ME, there is no need to do such a comprehensive ME cleaning procedure. Then only thing left is to write the corresponding DMI data back into the image (must naturally do first a backup on the original BIOS).Leave a comment:
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Hejka, miło poczytać coś po polsku, i to z tak daleka. Pozdrawiam. Czarek.Leave a comment:
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Admin[USER="1"]Admin[/USER], thanks for the upper info / change.Leave a comment:
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[B]Hi, I can't believe this, I have solved the issue, having almost given up.[/B]
[B]Everything I had to do is change the disk in Samsung Magician to work in FULL POWER MODE. This is an option in Performance Optimisation.[/B]
After changing this, the disk boots with Windows without any issue also in M.2_2.
Seems this board is just not able to correctly handle modern disks with power saving functions. This is probably really a BIOS or Microsoft NVME driver bug, or an unsolved Samsung Firmware issue, who knows.
For all those people struggling out...Last edited by DynaxSC; 02-23-2025, 06:59 PM.Leave a comment:
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Admin[USER="1"]Admin[/USER] - I posted the Boardview twice, but it disappeared ??????????Leave a comment:
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ASUS ROG STRIX B550-I GAMING - M.2_2 port not working correctly with SAMSUNG SSD980 1TB NVME SSD
Hi,
I have an really very weired issue with ASUS ROG STRIX B550-I GAMING.
Some NVME (PCIe) SSD's are not working correctly in the second M.2 socket. An example of it is the SAMSUNG SSD980 1TB NVME SSD.
Some other NVME (I have only smaller ones) disk do work without any problem, also SAMSUNG disks, eg an MZVPV128HDGM-0000.
The behaviour is also really very strange, i.e.:[LIST][*]The disk shows always up in BIOS - so it is recognized, so far so good[*]POST-ing with this disk with fresh Windows 24H2 installation (done in the M.2_1 socket) in the M.2_2...
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