[Solved] RX 460 Blown Fuse

[iRevert]

Just out of curiosity what hot air station have you been for this project?

I've been trying to talk myself into picking one up.

 

[kodaf56]

Just out of curiosity what hot air station have you been for this project?

I've been trying to talk myself into picking one up.

I’ve been using 858D hot air station.

 

[iRevert]

Thanks!

 

[kodaf56]

From what I found, 81161 is decreasing resistance of this resistor (without it resistance is 10K, just like after desoldering this resistor from the board). But on this phase even with a 81161 from the other phase it still has that 8.7K resistance.

Once again it was just one pin on 81161 that caused this. It wasn't soldered properly, because I really should use solder in paste or at least clean the old solder and not just reflow the solder that was there. I'm still learning hot air soldering. But anyway after making sure that every pin is soldered correctly that suspicious resistor has now 8K - which is I guess good. At least close enough to 7.8K-7.7K of other resistors.

So let's summarize what we learned now. It's not only a mosfet, not NCP81161 (that time gate to ground voltage was low I think I just killed the 81161 by running into the mosfet failure few times), nor the bootstrap capacitor. Also on my last try to run the card after fixing that resistor issue I once again checked the gate to ground voltage and it was the same as on the other phases, but it was hitting 13v more frequently. Which I think is normal, because this phase seems to be the main phase that is always used the most. Anyway card died when I was redoing my measurements - problem is still there.

In my free time I checked NCP81022 - VRM controller. And one pin made me suspicious. It's called CSREF and I have there like 2 ohms to ground. Pin description is in the image below. Should it be like that?

 

[Tomako22]

Hello, it's a bit old here, but I just found that you have super photos of this graphics card. I'm trying to repair a rx560 and IC I'm looking for looks very similar. So if someone could send better photo what IC is it specifically I would be really grateful.

 

[N4CR]

Just out of curiosity what hot air station have you been for this project?

I've been trying to talk myself into picking one up.

FYI I got an 878DD it's the big brother and it's a great station (solder and hot air). Paid for itself already many times over fixing LG v10s lol.

Pretty heavy actually and looks skookum built for a cheap unit.

 

[N4CR]

Hello, it's a bit old here, but I just found that you have super photos of this graphics card. I'm trying to repair a rx560 and IC I'm looking for looks very similar. So if someone could send better photo what IC is it specifically I would be really grateful.
View attachment 319193View attachment 319194

If you have no luck, reply to me and I'll PM them for you Cheers

 

[iRevert]

FYI I got an 878DD it's the big brother and it's a great station (solder and hot air). Paid for itself already many times over fixing LG v10s lol.

Pretty heavy actually and looks skookum built for a cheap unit.

In life I've found that AIO unit's rarely do as well as a good singular use unit, plus I got a sore dick deal on a Hakko iron and it's pretty hard to compete with it at the pricepoint I paid.

Appreciate the follow up, I had to backburner my hot air station quest due to other priorities but at some point I'll get back around to it.

 

[Tomako22]

If you have no luck, reply to me and I'll PM them for you Cheers

I found one photo and think it might be 74LVC1G08. It arrived today, after bit of work with soldering iron IT HAS BOOTED up fully working.

 

[Smok66]

Another card with a damaged MOSFET on the same phase. After removing the short circuit, the card works and its performance checked in the FurMark program.