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| MSI Z270 SLI PRO (MS-7a59) Faulty PCIE lane switching https://vlab.su/viewtopic.php?f=237&t=143600 |
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| RhOuCnK [ 06 авг 2024, 08:22 ] | |
| Заголовок сообщения: | MSI Z270 SLI PRO (MS-7a59) Faulty PCIE lane switching |
Hi! I'm a bit stuck on a repair. The motherboard is an MSI Z270 SLI PRO (MS-7a59) It has 4 mux switches between the two main pcie connectors. Its supposed to work like this: If there is only one gpu inserted into the top slot it has all the 16 lanes. But if there are two gpu-s inserted the lanes from the cpu are split between them. The problem is that the switches are stuck on, so even if only 1 gpu is inserted it only has 8 lanes and is trying to communicate over 16, so no image out, only using an X1 adapter. I have narrowed down the problem a bit, but cant really find a solution. The problem is that as far as i can see the only cause of the problem is that the PCH is not outputting the correct signals for the logic circuit to work. I however have no idea how the pch generates these signals and why they are wrong. To my understanding both PEG_MODE 0 and 1 should be either high or low. Further findings: In default (faulty) state if i plug in a gpu to the first slot it cant initialise, the image comes out of the igpu, the gpu is not recognised. If i tape over the gpu connector so only 8 lanes can touch the slot, the dis gpu works. If i short the X8_EN# to ground the dis gpu initializes, but only in X8 mode. The second slot only works with an X1 adapter, the same as before. So If X8_EN# is low it somehow enables the first gpu to run, but the switches still doesnt do anything, which doesnt seem right to me. Thanks for the help in advance! |
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