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| Sapphire RX580 4GB Nitro+ missing VDDCI https://vlab.su/viewtopic.php?f=48&t=127350 |
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| dani82 [ 15 июл 2022, 17:11 ] | |
| Заголовок сообщения: | Sapphire RX580 4GB Nitro+ missing VDDCI |
Sapphire RX580 4GB Nitro+ Power 12v, 5v, 1.8v Pcie 23 Ohm (0.9v) Memory MVDD 42 Ohm (1.5v) Gpu 1 Ohm (0.89v) VDDCI 24 Ohm (0 volt) APW8722a VDDCI pin 1 - (12v) 2 - 6k (0v) 3 - 10k (gnd) 4 - 2k (0v) 5 - 1.4k (12v) 6 - 7k (0v) 7 - 3.6k (0.03v) 8 - 24 Ohm (0v) Try to change APW8722a with new one, change to RT8120a (change res to 0), change bios. No Result. VDDCI APW8722a pin 7 comp must arround 1.5v where it come from? what responsiblee for this pin? Any schematic for this card? Any idea where to start dig? |
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| dani82 [ 16 июл 2022, 08:08 ] | |
| Заголовок сообщения: | Re: Sapphire RX580 4GB Nitro+ missing VDDCI |
https://ibb.co/nPYwRw9 |
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| com77 [ 16 июл 2022, 13:06 ] | |
| Заголовок сообщения: | Re: Sapphire RX580 4GB Nitro+ missing VDDCI |
dani82 If you track VDDCI_COMP in any circuit containing VDDCI, you will see how the control signal is applied to this pin. I mean the 7th pin. It performs both an enabling function and a compensation function. You can use this circuit for example: viewtopic.php?f=48&t=88497&p=915354&hilit=%2AV341%2A#p915354 The chip is different, the principle is the same. |
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