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.

 

[Imperator]

HELLO
Bellow you have the picture with the fuses

 

[Tjempo]

Thanks! I measured all the fuses and I don't think one is broken.
I tried turing it on and the core didn't heat up. Could there be something else phisically on the board that is causing it not to deliver power to the core?
I already checked the vrm's but they are all at 3.49 Ω. Should i just measure if the board gets voltage?

 

[looniam]

Thanks! I measured all the fuses and I don't think one is broken.

thats because i'm very sure you measure inductors and not fuses; which looking like this . . . little SMDs.

you have a group of three SMDs by the the 8pin power plug and that little guy down by the pci slot key (ion the white box) and the one above it look some potential candidates to prod w/multi meter.

 

[Tjempo]

you have a group of three SMDs by the the 8pin power plug and that little guy down by the pci slot key (ion the white box) and the one above it look some potential candidates to prod w/multi meter.

I cant seem to find them. I don't have those white fuses on my board....

 

[Shrek]

The solder blob doesn't look good

 

[Tjempo]

The solder blob doesn't look good

Oof yes. should there be something or is it just some solder?

 

[looniam]

I cant seem to find them. I don't have those white fuses on my board....

they don't have to be white as shown - sorry if it confused. just google GPU FUSE (images) and you'll see they are all colors and sizes. unless given better directions than what i can give; you'll probably check alot resistors before finding the fuses.

w/o exact first hand experience try browsing through buildzoids YT channel. there are hours of graphic card and motherboard breakdowns . in one of the gpu ones might show you better about finding the fuse(s). but that might take day to sort through.

(WARNING crazy suggestion incoming!!)
in the meantime - just keep poking your multi meter on things. when you find an SMD (surface-mounted device) that doesn't have continuity - then consider shorting it with a small gauge wire - it will lift the protection a fuse provides - so use CAUTION!

picking up what i'm throwing down?

 

[Tjempo]

Could these be the fuses? And what do i need to look for when checking resistors? because almost all of them give no reading while the fuses are at 0.00. Is it the same for resistors?

 

[Shrek]

Even if they were fuses they would be for the port they are near.

Question for the experts here; do graphics cards use self healing (PTC) fuses?

I have a washing machine that would keep blowing a fuse after running for a bit, which I eventually figured out was shorted windings in the pump (which was still working); the great thing was that the PTC fuse would cool down and so reset. Same thing for one of my digital multi-meters, the fuse for the current resets after cooling down.
Resettable fuse - Wikipedia

I also have an ATX breakout board that turns a PC power supply into a stand alone supply; it has PTC fuses, so I don't have to worry about shorting the supply.

 

[Tjempo]

The solder blob doesn't look good

I have seen some pictures about it and i dont think it an issue. all of the Asus cards have those blobs

 

[looniam]

Could these be the fuses? And what do i need to look for when checking resistors? because almost all of them give no reading while the fuses are at 0.00. Is it the same for resistors?

one thing i must admit first off - i am far from the most proficient at using a multimeter off the top of me head.

can i tell you how i've seen others find fuses?
yes.

can i tell you exactly how?
no. i am sorry.

for now, posting pics are very helpful, thanks for that. but for me - i would need the card and a multimeter (with it's manual/a text book *ouch*) in hand to know for sure.

what i do know is the burden is on you sorry- it's gonna be a long ride unless someone who know better *pops in the thread*

 

[Tjempo]

So while probing things i noticed that some of the conductors and vrm's would only measure after scraping them a bit with the probe. They dont look corroded or so.
I have thought about 'reflowing' the gpu. would that help to "clean" the gpu?

 

[looniam]

if you are sure the problem is not a blown fuse, then a reflow (aka an oven bake) is not a bad idea.

however that does come with its caveats . . won't last long - find a a replacement.

edit: what you need to scrape off for the probe doesn't mean the contact/PCB layer has an issue, yeah?

 

[Deleted member 185158]

Here's one of the fuses circled in red. I'd check that one first.

 

[Tjempo]

I think i might try to oven bake it. some of the parts do look a bit corroded:

I did my best trying to take a picture of it.

Here's one of the fuses circled in red. I'd check that one first.

I checked the presumably fuse and it has a resistance of 1.41 kΩ *
* i don't know if its the right scale

 

[Deleted member 185158]

I think i might try to oven bake it. some of the parts do look a bit corroded:

I did my best trying to take a picture of it.

I checked the presumably fuse and it has a resistance of 1.41 kΩ *
* i don't know if its the right scale

You don't measure a fuse for resistance. You measure continuity. Either it's broken or it's not.

A lot of the times fuses look like Inductors, but generally larger.

Watch the traces. The fuse is the link between to hot lines. So positive voltage on both sides when fuse is good.

 

[Tjempo]

You measure continuity

If i understood you correctly, its very consistent with the 1.41 but when i move the probe a bit its jumps around a bit and then goes back to 1.41 is that oke?

 

[Deleted member 185158]

If i understood you correctly, its very consistent with the 1.41 but when i move the probe a bit its jumps around a bit and then goes back to 1.41 is that oke?

You should have very little to no ohms when measuring a fuse.
So I don't think you are measuring a fuse, the last picture I have no idea what you was trying to show us.

.5 or less would be a fuse reading. Should be closer to .1 really.

Again, measuring continuity. If your multimeter has that setting, it may beep when you touch the leads. That is how some multimeters test continuity.

 

[Tjempo]

Here's one of the fuses circled in red. I'd check that one first.

Well I don't think its a fuse like you said, doing the continuity test it didn't beep and gave a value of 1430. So I thinks that its a resistor because the small one next to it has the same value

the last picture I have no idea what you was trying to show us.

That one was about the "what looks like corrosion" on some of the solder.

 

[Deleted member 185158]

Well I don't think its a fuse like you said, doing the continuity test it didn't beep and gave a value of 1430. So I thinks that its a resistor because the small one next to it has the same value



That one was about the "what looks like corrosion" on some of the solder.

It's gotta be a fuse right there. However I can't follow the trace because I can't see it in the picture. Follow the trace +12v to the fuse and measure it. If it's not that one, then it's another.

And if you do not have continuity, then it's a broken fuse.

Remember, the fuse is always at the start of the circuit.

Also, I want to mention, when a fuse pops, it's usually audible and you'll see it burnt. I don't see this in your pictures. Did you hear a pop?

Perhaps a reflow is a good idea. So far not sure.

Did a google, looks like Sapphire has different style fuses, so can't use that PCB for comparison either. It's completely different.

Probably be easier if I looked for a schematic?? Not sure if I'll find one though.

 

[eidairaman1]

You don't measure a fuse for resistance. You measure continuity. Either it's broken or it's not.

A lot of the times fuses look like Inductors, but generally larger.

Watch the traces. The fuse is the link between to hot lines. So positive voltage on both sides when fuse is good.

You can use resistance to find continuity, however you must have a known good component to know for sure what is bad.

 

[Deleted member 185158]

You can use resistance to find continuity, however you must have a known good component to know for sure what is bad.

Continuity of a fuse should have a resistance of near 0.1 ohms. That's all I know. lol.

I should say 0.0 ohms. It would be considered part of the trace until it popped.

 

[eidairaman1]

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?

View attachment 225006View attachment 225007View attachment 225008View attachment 225009View attachment 225010

Yes a lot of pictures.

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

Continuity of a fuse should have a resistance of near 0.1 ohms. That's all I know. lol.

I should say 0.0 ohms. It would be considered part of the trace until it popped.

Different ratings in fuses

 

[Shrek]

Here's one of the fuses circled in red. I'd check that one first.

View attachment 225042

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