If the signal is present the core should be running (or at least have the voltage needed). If there's no PWM signal but the Vcc is present we move to the phase controller. If there is no Vcc there probably isn't a PWM signal either so we look into a logic voltage regulation part of the board under the 8-pin connectors. 2) Find out if the VRMs (IR3550) are being supplied with a PWM signal by the 6+2 phase controller (IR3567B) as well as Vcc. If the voltage isn't present you need to check the fuses. Each of the 8-pin plugs has 3 +12V rails which should go directly to the Vcore VRMs. 1) You need to find out if the 12V rail is present at all the voltage regulators of the 6 phases of Vcore (this should be the case whenever the 8-pin plugs are connected) or there is continuity from the 8-pin plug to the VRMs. At this point, we are testing the power supply for the card so there's no need to plug the card into the PCI-E slot (I believe it doesn't use the slot voltage supply for any functionality to the right of the VRAM modules, but I might be wrong.). From this point on I'll use the markings from the above video as descriptors. I wouldn't be surprised if someone used it as a parts card (or you might be lucky and someone before you already found the issue in the missing parts and only removed those.). Did you check the fuses and 0 ohm resistors for continuity? I would suggest you start by finding a high res image of both sides of the PCB and carefully check if there is anything else missing.
This still doesn't explain why you don't have 12V on other voltage regulators tho. According to him, those are voltage regulators (4C10N ON Semiconductor) for VRAM *gulp*.
Check out Actually Hardcore Overclocking's video on the R9 390 Nitro. Oh boy, you are missing 4 chunky components to the left of the power connectors.
Is there any hope for this card? thank you in advance! Stay safe! This was given to mt by a friend who used it in mining. I also have another xfx rx 470 with 8gb that has two thick lines with green and pink throughout the screen. I have seen some guys using ipa and applying a small voltage to see whether there is a component that is heating up but I don't know where to apply that power and I also don't want to destroy the whole card. Also, I can't take the inductor off from the memory vrm to see if the short is from the memory chips or from the mosfet controller. The ohm reading from ground to the other phases are 2.2 ohm for the gpu vrm, 0.2 for aux vrm, 0.2 for mem vrm and 0.1 for 0.98v rail. I checked with the ohm meter and there is an 0.1 ohm in there betueen D and S. I tested the 3553m mosfet and they all seem to work fine but the 4c10n ware shorted on the drain and source so I tooked them out and I have seen that the mosfet are perfectly fine but the pads are still shorted. I only came across the 12v inductor that is near the aux vrm but all the vrm's did not display any voltage what so ever. When powering the pc, the main gpu did not heat up so I tried to measure the voltages across the phases. The gpu's bios switch powered on but that was it so I took the radiator off and plugged the gpu back in the motherboard. Firstly I plugged the card in my computer and checked what is doing. I do repair some basic staff and troubleshoot tv's xbox controllers and power bricks but never attempting to repair a pcb with only smd s and so many components.
#Xfx radeon hd 6850 12v rail upgrade
I have a r9 390 nitro gpu that I bought as broken because I really wanted to upgrade my existing hd6850 gpu. Hello guys, My name is Alex and firstly I would like to say how much I will appreciate all the help and effort in diagnosing my problem.
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