Hello guys,

How do you proceed with rewiring data lanes when when you have damage or short on first pin of first data pair front side (HSOp(0)), or first pin of first data pair back side HSIp(0)?
Any videos or instructions?

viewtopic.php?f=48&t=121050&hilit=riser

Give them a riser.

Thank you for your response brother, but can you point me in the right direction of how to do it for Nvidia cards?
I am very grateful for your help.
I read all the posts, all what is explained is for AMD cards!
I have transferred 2nd data pair on 3070 and 3090 to first data pair, front and back, it's not working!

hAdy994
3080 частично битая первая диф пара, повышенное сопротивление, не виделась платами - cообщали о пустом слоте
Переносил диф пары со второй, последней, менял полярности и прочие варианты - увиделась платами как устройство в слоте с х0 линиями в классическом для gtx10xx варианте, т.е. с переносом 16й линии на первую, без инверсии полярности, второй рисунок из этого сообщения: viewtopic.php?p=920643#p920643

Соответственно ни ОС (виндовс 7/10, убунта и тп) ни MODS/MATS не определяют устройство, битый gpu. Общение по диф паре с платой - минимальное кратковременное, если сравнивать с рабочей видеокартой

No, I use this technique for NVIDIA cards also. I do not swap lanes on the card, I make a custom risers for a damaged cards. This topic: viewtopic.php?f=48&t=119633 is an exact description what has to be done. Do not mess with cards, make only a riser. It works for AMD and Nvidia cards on Intel chipset, Nvidia chipset and AMD chipset.

Maybe your card is damaged more seriously?

PCIe - 15 on 1, 16 on 2 (do not forget to cut the lines to the GPU - 1 and 2 ). On the reverse side of the board, it’s easier there - there are capacitors there, (two need to be unsoldered), and also 15 on 1, 16 on 2. (2 days ago I fixed 1060 like this)

Пару дней назад так 1060 восстановил - вставили в райзер под напругой, по итогу - на первом контакте первой пары КЗ, на втором 30 Ом. Перекинул 15-1, 16-2, обрезав дорожки к ГПУ, с обратной стороны так же 15-1, 16 -2, там резать не пришлось - просто 2 кондёра выпаять, два развернуть на площадках, и к их висящим выводам перемычки подпаять.
3 дня полёт нормальный (райзер).
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Quite possible.

This is impossible scenario. The capacitor should withstand a quite high DC voltage without damage. You can't kill the back lane by a reverse polarity. Something other, catastrophic must happen to kill the lane behind capacitor. For example AC of some sort and it rather kills the GPU.
Are both reference clocks good and a pex reset?

Ok to answer this, I have to give you a history of these 2 gpus. One 3070 and one 3090, both not detected. According to the owner, only 3070 has been inserted backwards, and 3090 stopped being detected after a power supply went bad. Customer took them to a shop, they reflowed both GPU cores. They ended up damaging the 3070, now has code 43 and errors on all memory banks in MATS, so most likely damaged memory controller.

The 3090 ended up with a short at the capacitor of the first data lane HSIp(0), the capacitor is perfectly fine, and the short is 22 ohms and on the core side. HSIn(0) is also 300 kohms, which is very high compared to the other pins.
I rewired the data lanes on the card, like in the pictures, and the card is not working on a riser in x1. It works normally on my AMD X570 motherboard, but customer insisted on me to make it work on a riser, they didn't want to buy a new motherboard and cpu.

Refclk +/- and pex reset both fine and present.
Posted after 5 minutes 42 seconds:
I tried these 2 modifications on the cards
I know it's not clear but I cut the first data pair and rewired 2nd to first, both front and back.

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Posted after 1 minute 5 seconds:
Thank you so much guys anyway for the help! I appreciate it a lot. I will rewire 16 -> 2 and 15 -> 1 according to your instructions and will update you further!

What morons, idiots, they tried to repair electrical failure by a reflow. Make this riser as I described in the mentioned topic. Make two or three of them for the next customers and self diagnostics.
Remove capacitors from a failed lanes, cut front traces and if it works on your AMD it will work on a modified riser.

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Posted after 6 minutes 50 seconds:

Do not rewire anything on the card. Make a riser. The last lane will go to the first lane and that's it. You will not care about adjacent lanes to the faulty lane.

Ok brother.
Thank you!

Do this:

Thank you so much my friends!

Hello guys, I did what you told me to do, 16-->2 & 15-->1, on my 3090, it didn't work. Maybe I should rewire the sense pin also? Which is the 2nd to last pin on the front side.
Or maybe I should do 16-->1 and 15-->2?
Please help me, I am very confused with the information. Can someone who has tried this on nvidia confirm which method or modification is the best?

I just realized that this is crossed wiring on the front but normal wiring on the back, so I rewired them in normal and it still doesn't work!

Any help?

It was said somewhere that it has automatic polarity detection so no meter how you connect it.

Ok then why it didn't work?

any update here? im trying rewire data lanes in a 2060.
what i do, and i get x4 in all posibilities.
the same for the front lanes and the back lanes.
cut 1 - 4 pairs (8 lanes) and move 5-8(from gpu) to the 1-4 (to pci) front and back, result x4.
now 5-8 on PCI unconected, so i move 9-12 (from gpu) to 5-8 pci.
in short, unconnect first 4 data pairs, and move the next 8 data pair (5-12 from gpu) to 1-8 (pci) and still geting x4.
i wanna know if there are a chance to get x8! thanks