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ASUS 1080TI turbo PEX Reset продолжить ниже поток https://vlab.su/viewtopic.php?f=48&t=118399 |
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hashwood [ 25 авг 2021, 13:26 ] | |
Заголовок сообщения: | ASUS 1080TI turbo PEX Reset продолжить ниже поток |
привет, я хочу рассказать небольшую историю, потому что я закрыл обсуждение, а теперь заблокировано. Пришел 1080 ti asus turbo, все измерения в порядке (напряжения и импеданс_, GPU нагревается, но через 1-2 минуты. На выводе PCI Pex_Reset было измерено сопротивление 6 Ом. Эта плата не буферизована. Я не сдавался. Я пробовал переплавку. Теперь PEX_Reset составляет 7кОм и плата исправна. Это может случиться. Спасибо пользователю Pandemonium6 за помощь. |
Pandemonium6 [ 25 авг 2021, 19:59 ] | |
Заголовок сообщения: | Re: ASUS 1080TI turbo PEX Reset продолжить ниже поток |
Haha I was thinking why did you close the topic https://www.theguardian.com/technology/ ... ngineering Maybe it was a whisker. This is effect when a tin needles build up along the electric field. PEX_RESET is +3.3V so it maybe was a 6 ohm whisker to the ground. 6 ohms is rather a strange value. This is normally open circuit when the semiconductors are fried in I/O pins, at least all pis I have found damaged look like open or almost open. There is another way to burn such a whisker by a strong current. This PEX_RST pin is 3.3V capable so you could connect 1-3V directly from the power supply and it should not do anything wrong. Logic level is to weak to do it but by a direct PSU voltage should burn it as a fuse. It is risky because if there is something stronger like a liquid metal you would burn PCB. So the first should be IPA + compressed air and then maybe 1Volt from the power supply. 1V from the PSU definitely would burn such whisker and should not fry the PCB. Soldering on a proper reflow machine is the safest and at once will repair all other joints. I set a profile and when it reaches the reflow phase above 200'C I wait to cross 220..225..230.. and I start touching the chip. When I feel the chip is floating I stop the process and let it to cool. I press te "red" button on the Chinese reflow machine, nothing special IR6500 but it is enough plus flux 218 noname clear, transparent. I put flux around the chip, a lot of flux, then 10 minutes preheating from the bottom only to remove moisture and so on some minutes at 110'C to be sure that no popcorning will happen... |
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