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PSU fuse replacement

mclaren85

mclaren85

Joined
Jan 22, 2020
Messages
1,114 (0.58/day)
Location
Turkey
System Specs
System Name MSI-MEG
Processor AMD Ryzen 9 3900X
Motherboard MSI MEG X570S ACE MAX
Cooling AMD Wraith Prism + Thermal Grizzly
Memory 32 GB
Video Card(s) MSI Suprim X RTX 3080
Storage 500 GB MSI Spatium nvme + 500 GB WD nvme + 2 TB Seagate HDD + 2 TB Seagate HDD
Display(s) 27" LG 144HZ 2K ULTRAGEAR
Case MSI MPG Velox Airflow 100P
Audio Device(s) Philips
Power Supply Seasonic 750W 80+ Gold
Mouse HP OMEN REACTOR
Keyboard Corsair K68
Software Windows10 LTSC 64 bit
My 300W exploded due to shortcut caused by accidental water spill today. I will change the broken fuse but I don't know the correct replacement. Which Fuse should I buy? 3A or 5A or else?
 

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What does it say on that circuit board about replacing the fuse?

If it doesn't, ALWAYS go with the lessor value, in this case, the 3A.

And then if it blows, I would consider getting a new PSU. A bigger fuse may allow too much current to flow in the circuit resulting in potential fire. Not good.
 
mclaren85 said:
My 300W exploded due to shortcut caused by accidental water spill today. I will change the broken fuse but I don't know the correct replacement. Which Fuse should I buy? 3A or 5A or else?
Click to expand...

What is written on the fuse?
 
Andy Shiekh said:
What is written on the fuse?
Click to expand...
THIS
there are identifying numbers stamp on the metal ends. you will need to remove the fuse to see them fully and should help find the specs.
 
I wouldn't be messing with a PSU unless you properly know what you're doing, and even then that thing looks like it should be e-wasted and replaced with something of quality.
 
Toothless said:
I wouldn't be messing with a PSU unless you properly know what you're doing, and even then that thing looks like it should be e-wasted and replaced with something of quality.
Click to expand...
Actually I was planning to build and old system. All the parts are made in 2008 and 2009. This psu was the latest part.
I have so much fun while gathering the obsolete pieces.
When finished without fault hopefully, I will post a new topic to share my experiences.:)
Thanks everyone who have contributed..
 
People are concerned for your safety when messing inside a power supply.
 
Hi,
300w
Why take a chance these things are relatively cheap psu size :/
 
Almost sure (with or without "help" from waters side) somethig in that low quallity PSU is STILL shorted and it'll blow up replacement fuse too. Not worth the risk, replace that junky PSU.
 
I wouldn't replace the fuse. The power supply does not look like a good unit to begin with and it's possible water has caused more damage than you know currently. Plus, it can be risky to replace if you don't know what you are doing.

Here are 2 budget oriented power supplies that, while not great, are much much better quality and will be a much better idea to use than the current one.
www.newegg.com

EVGA 550 BP 100-BP-0550-K1 550 W Power Supply - Newegg.com

Buy EVGA 550 BP 100-BP-0550-K1 550 W ATX12V / EPS12V 80 PLUS BRONZE Certified Non-Modular Active PFC Power Supply with fast shipping and top-rated customer service. Once you know, you Newegg!
www.newegg.com www.newegg.com
 
What psu is that.

your spec says u have a seasonic psu, but that looks like a generic chinese supply. normally these dont even have switching.


the fuse value is written on the fuse. you can almost see it here in the pic.


but from my experience, if your fuse is blown, something else has already broken in your PSU.

fuse is the last thing to go. it is just there to prevent ur PSU catching fire. if its a seasonic PSU it will have short circuit protection.
 
Distinct heatsink shape suggests it being generic Leadmann OEM garbage, and for certain very old anyways.
Don't bother replacing fuse. It may very well not be the only thing blown.
Buy a new PSU.
 
I see that it's a no name brand "Quake" PSU. These are garbage so don't try to fix it, just bin it and get quality from the likes of Seasonic, Corsair etc. If you absolutely must try to fix it, ensure that you use the original amperage fuse and connect it to a PSU tester, since if it's faulty, it could destroy your PC. Totally not worth the risk.

EDIT: even worse, it's a soldered fuse. Just bin it and buy something decent instead. Your PC will thank you for it.
 
As others have stated and from the looks of the fuse,at least one 0ohm resistor would have blown also somewhere.
you can probably buy a cheap old no name brand PSU for the cost of a pack of fuses.
 
de.das.dude said:
What psu is that.

your spec says u have a seasonic psu, but that looks like a generic chinese supply. normally these dont even have switching.


the fuse value is written on the fuse. you can almost see it here in the pic.


but from my experience, if your fuse is blown, something else has already broken in your PSU.

fuse is the last thing to go. it is just there to prevent ur PSU catching fire. if its a seasonic PSU it will have short circuit protection.
Click to expand...
My current system is already has the latest feature, but here I'm building an old system. Just for fun:) It has AMD sempron cpu and 1gb ddr2 ram:) and the psu is 300w quake
 
What? 12A? Never.... that's for rice cooker.

Tigger said:
must have been 12A+ at least.
Click to expand...


mclaren85 said:
My 300W exploded due to shortcut caused by accidental water spill today. I will change the broken fuse but I don't know the correct replacement. Which Fuse should I buy? 3A or 5A or else?
Click to expand...

First of all, use a fused cable for your power supply, so instead of having your psu popped, the fuse inside the cable will pop first. something like this:

1646412808889.png


Then, for Amperage, if you're not in usa; using 220v: you must use 3amp. remember psu is not 100% efficient. so it takes more power than it delivers.
watt = amp x volt

btw, your psu says use 4amp for 230v. so use 3amp, you'll be fine.
make sure you're not using a Timed fuse. it must pop instantly.
 
Does it actually say "Quake" or its just my eyes deceiving me? :laugh: At least its not Doom

But to be serious, if a water spill triggered that, then there can be more issues elsewhere on the power supply. Like a blown mosfet (usually shorted to ground) or something, which was shorted by water and as a consequence blew up the fuse. Usually in electronics a blown fuse is just a consequence, not the primary cause of malfunction. And disassembling power supplies is potentially dangerous as there is high voltage inside even if unplugged. ...Aaand because its a cheap power supply i really doubt its worth repairing. Just buy a branded one (like some evga W1, or deepcool da500, good sub $60 power supplies that are being sold around the globe) and make sure you dont spill water on it.
 
There is the series light bulb trick... put a mains light bulb in series with the device being tested;
if it lights up, there is a problem.

This is a nice way to test a device without damaging anything.
 
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Andy Shiekh said:
There is the series light bulb trick... put a mains light bulb in series with the device being tested;
if it lights up, there is a problem.

This is a nice way to test a device without damaging anything.
Click to expand...
Depends on power rating of a light bulb. This sempr0n system could act like a dimmer for a 60W or 75W lightbulb (incandescent), depending on load you'd get all kinds of "ambience". :)
 
Fair enough, but you get the idea; namely not to damage anything, not even the new fuse.
 
throw it in the bin before it kills other hardware... or even you
 
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