Help me find the fuse!

[Tjempo]

Hello everyone.
I have this gpu (Rx 570 Asus expedition non-oc) I got from a friend, Its doesn't work: the fans don't spin and the screen stays black.
I think its a blown fuse so i took it apart but i cant seem to find a fuse on the board.
Can someone tell me where they are?

Yes a lot of pictures.

 

[eidairaman1]

You sure that's a fuse? and not 3 decoupling capacitors in parallel.

If shipping wasn't so damn expensive id say send it for repair lol

 

[Deleted member 185158]

You sure that's a fuse? and not 3 decoupling capacitors in parallel.

From what I can see... Looks like a fuse. Am I sure no. I don't have the card or a schematic.

Never the less, the fuse will be right by the plug.
Most of the caps have fuses also.
There's a big + on the green board. Follow that to your fuse.

 

[Tjempo]

Plug the card into a system that has an igp/apu or a known good card (put into spare slot) boot from the good devices and then ge

I have a spare computer that has an igpu. But would it be possible to flash the card? because It stays off so the card probably would not be recognised by the system.
Well i can give it a shot.

 

[Imperator]

Hello
Before you flash the card make a picture of what GPU-z reports about it in the second system where you have iGPU.
Also go to devicemanager and check what appear there.

 

[Tjempo]

I noticed something weird. These 3 capacitors all have the same text on them.
But number 1 and 2 are at 484 ohm but number 3 is jumping around 100 and 120
Im measuring the points left and right of the capacitor

 

[Naki]

Sorry but I think thus Expedition video card needs a no return expedition to the GPU Happy Hunting-grounds.

I doubt it is salvageable at this point.

 

[Caring1]

Do the power LEDs light up at all?
Have you probed the test points on the board, one marked 12V and another near the top edge marked VRM Test?
Also, those Digi+ chips are known to cause issues, sometimes pressing on that while powered on can show signs of life.

 

[Nike_486DX]

Try hooking up to igpu and booting into the OS to see if ur rx 570 is being detected in some way. Besides that there is little u can do about a card which powers on + gives no image. Other method would involve an oscilloscope, which u probably dont have (neither do i, had fixed a couple of cards in the last few months, mostly replacing mosfets)

 

[eidairaman1]

I have a spare computer that has an igpu. But would it be possible to flash the card? because It stays off so the card probably would not be recognised by the system.
Well i can give it a shot.

Pardon. What i said at end us get a gpu-z screenshot

 

[Nike_486DX]

Does the pc "power" on (cpu fan, psu fan etc start spinnning) with the graphics card plugged in? Keep in mind that there are 3 main voltages that every pc component use, 3.3v, 5v and 12v. Every power supply has SCP, which automatically measures the resistance on these rails to ground, and if it finds low resistance then the protection triggers automatically. So the pc will shut down automatically with the faulty component installed. When u remove it, everything boots up normally.

As i read the original question, you said that the system does power on but gives no image, right? That means there is no short of any kind. And yeah, there are NO FUSES ON THIS CARD. So if thats the case ("powers on + gives no image" situation), then switch over to another mobo with igpu, plug the cable into the mobo, and also connect the rx 570 into pcie + connect the pcie power of course. Monitor should only be connected to the igpu (motherboard) Start the system and go to device manager or hwinfo or aida64 ("physical devices" tab), to see if the radeon is showing up.

 

[Tjempo]

Do the power LEDs light up at all?

Plugging in power to the eps connector lights up a white LED. I can try measuring the points.

I had fixed a couple of cards in the last few months, mostly replacing mosfets

How did you discover if the mosfets where broken? I belive mine has only one (Between the HDMI and DisplayPort)

Pardon. What i said at end us get a gpu-z screenshot

Start the system and go to device manager or hwinfo or aida64 ("physical devices" tab), to see if the radeon is showing up.

The card doesn't get detected by the system. The system only lauches on the IGPU and no sign of the GPU...

Does the pc "power" on (cpu fan, psu fan etc start spinnning) with the graphics card plugged in?

Yes it does. However i do think the system realises something is wrong because after sometime the fans ramp up (this was only once tho)

Oke. I measured the points on the back of the board here are the measurements:

3.3V = 3.29V
12V = 11.96V
1.8V = 1.8V​

5V = 5V​

Ground = 0.00​

VGPU = 0.00V
VMem = 0.00V

So the GPU and the memory dont get any voltage. Does this mean they are dead or something else is causing it not to recieve power from the board?
It seems odd to me that both of them died.

I tried measuring the VRM's but i couldn't because of the position of the card. I can't reach it with the probes​

I belive mine has only one

No i'm wrong It has more. I found this Reddit post about mosfets which are coincidentally about my exact same GPU!​

 

[eidairaman1]

Plugging in power to the eps connector lights up a white LED. I can try measuring the points.

How did you discover if the mosfets where broken? I belive mine has only one (Between the HDMI and DisplayPort)


The card doesn't get detected by the system. The system only lauches on the IGPU and no sign of the GPU...


Yes it does. However i do think the system realises something is wrong because after sometime the fans ramp up (this was only once tho)

Oke. I measured the points on the back of the board here are the measurements:

3.3V = 3.29V​

12V = 11.96V​

1.8V = 1.8V​

5V = 5V​

Ground = 0.00​

VGPU = 0.00V​

VMem = 0.00V​

​

So the GPU and the memory dont get any voltage. Does this mean they are dead or something else is causing it not to recieve power from the board?​

It seems odd to me that both of them died.​

​

I tried measuring the VRM's but i couldn't because of the position of the card. I can't reach it with the probes​

No i'm wrong It has more. I found this Reddit post about mosfets which are coincidentally about my exact same GPU!​

Ok so you had monitor hookrd up to igp and thr gpu in its slot, started the system then gpu-z and it could not see the card? Fyi in gpu-z you should see a tab/pull down menu to switch between display adapters

 

[Tjempo]

eps connector

Didn't mean EPS, PCIE power of course

started the system then gpu-z and it could not see the card

Yes, I also checked the dropdown menu. I also checked it on my main system and it only showed my primary gpu. I also tested a know working card and both of them show up

But could it be mosfets? or did the card overvolt or something and took down the Memory and the GPU?

Oh btw. I also found a kind of blueprint of my card. However im not nearly skilled enough to read it. ( I get some parts)
Maybe it gives some clue's about why there is 0 Volts over the Vmem and VGpu lines?

 

[eidairaman1]

Clean the pcie pins on gpu,blow your mobo slot out.

 

[Tjempo]

Clean the pcie pins on gpu,blow your mobo slot out.

I cleaned the slot and the card's pins. I also tested it in a know working slot.
But today I thought of something...
How does a gpu notice the system has been turned on?
Could it be that the GPU doesn't notice that it has been turned on.
So it doesn't turned the core, memory and the fans. What could cause that?

 

[Naki]

Common cause -- GPU is dead.

 

[Tjempo]

So, after a while of tinkering somehow (and I don't know how) The chip started warming up. so quickly turned it off.
Quickly putting it in and measuring the VRM's the voltage is 0. I don't know where it's getting its power from.

Also the pc somehow for a brief second noticed something from the GPU (screen went black and turned back on after a few seconds). but after 5 tries. I never saw it again.
So the GPu gets power somehow.

 

[Nike_486DX]

So, after a while of tinkering somehow (and I don't know how) The chip started warming up. so quickly turned it off.
Quickly putting it in and measuring the VRM's the voltage is 0. I don't know where it's getting its power from.

Also the pc somehow for a brief second noticed something from the GPU (screen went black and turned back on after a few seconds). but after 5 tries. I never saw it again.
So the GPu gets power somehow.

Looks like the vrm controller is faulty, or one of its adjacent components. I suggest that you re-test the voltages while the card is running (but this time without heatsink, you need to have full access to the pcb, test it with a riser / on an open bench if necessary. The vrm controller on this card is most probably powered by 5v lane, but you need to measure that voltage directly on the chip itself, to make sure its getting it. I didnt find a datasheet for this controller, but you can simply check for 5v on every pin, just make sure u touch 1 pin at a time.

Here are some quick references for what else to check on the board.
On the "components to check or replace" picture, red - possibly faulty components, green - adjacent areas to check, blue - most certainly good components.
On the "measure voltage while card is powered on" picture, green - voltage measuring points while card is working (put positive tip there, while negative is clamped onto card's ground, the metal io shroud for example).
On the picture "vrm controller, check for 5v", red - check for voltage while card is working, check pins one by one carefully (13 x 4 sides total), for 5v. Hopefully someone finds a datasheet for ASP1106GGQW to make it easier, as i didnt have enough spare time lol. In the datasheet the VCC is the pin where the controller takes the power from to operate.

 

[Tjempo]

Hello. I have been measuring the VRM controller (I haven't finished it because its very hard to put the pins on the right point and I haven't had much time recently) but anyways. At 2 points I found 4.95 Volts.
However when I pulled the card out of the slot and put it back in, the screen flashed and the chip started heating up again. I now know how to replicate this;
1. Turn system on
2. Put card in the slot. PCIe 8 pin plugged in but turned off.
3. turn on pcie

I have measured some points (the full measurements EPU will come later, but like 60% of the pins are at 0V)

 

[Caring1]

Digi+ chip is a common failure point.
Press down on it when powered up and see if that makes a difference.