Asus sf530f and Inductor 2r2

[edith]

Hello everyone. Anyone from Italy or maybe EU?

I need to buy an inductor which is something like:

2.2UH 8A 20M OHM SMD

Because i need it to replace on my asus s530f, because i broke this coil and i think i need it in order to fix it

[SMDFlea]

Re: Asus sf530f and Inductor 2r2

Link to schematics https://www.badcaps.net/forum/showthread.php?p=1191126

[edith]

Re: Asus sf530f and Inductor 2r2

Hello everyone. Anyone from Italy or maybe EU?

I need to buy an inductor which is something like:

2.2UH 8A 20M OHM SMD

Because i need it to replace on my asus s530f, because i broke this coil and i think i need it in order to fix it

Sorry maybe i was not clear, i meant to ask if you know something else apart ebay or aliexpress to buy these kind of smd.


What i found is just stock of them, and honestly i dont need 1000x pieces

[mon2]

Re: Asus sf530f and Inductor 2r2

Check RS Electronics; Digikey; Mouser.

You need to be sure to match the specs and physical size so you can solder on to the same pads.

Use a micrometer to measure the length, width and height.

Review the bottom side pcb soldering pads.

Or post some good pics of the part.

Bourns is an excellent line of power inductors.

[edith]

Re: Asus sf530f and Inductor 2r2

Check RS Electronics; Digikey; Mouser.

You need to be sure to match the specs and physical size so you can solder on to the same pads.

Use a micrometer to measure the length, width and height.

Review the bottom side pcb soldering pads.

Or post some good pics of the part.

Bourns is an excellent line of power inductors.

Thank you for your answer.

Im kinda new in this electronic stuff so i ask to be kind to my potentially silly questions.

The old one is a 2.2uh 10Ohm 8A.

Can i replace it with some inductor that fit the pads, but with bigger values? lets say for i.e. 4.7 uh and same or greater ampere.

[mon2]

Re: Asus sf530f and Inductor 2r2

It is a close value so it should work fine. If you have one available, do try it.

Best if you can use the same inductance as the original. Higher current support is always ok since it will have a lower DCR value.

[edith]

Re: Asus sf530f and Inductor 2r2

Thank you a lot! I will try and let you know!

[edith]

Re: Asus sf530f and Inductor 2r2

It is a close value so it should work fine. If you have one available, do try it.

Best if you can use the same inductance as the original. Higher current support is always ok since it will have a lower DCR value.

Oh sorry here another one.

I got a few broken motherboard from a pc seller. So i was looking at those inductances. One is this 4R7 which i was telling u.

How can i check how many current support?

I dont think i need to find those boardview + schematics for each motherboard, something quicker must exist i guess.

( i dont have the tool to measure inductance) just a multimeter and soldering tools

[mon2]

Re: Asus sf530f and Inductor 2r2

You can only review the inductance from the markings, so 4R7 = 4.7 uH.

For the current support, you can only guess by the physical size.

Best to purchase a new one if in doubt or select a beefy looking part for the job. Otherwise, under rating the inductor will cause the part to heat up quickly and/or nuke the inductor. Not recommended.

[edith]

Re: Asus sf530f and Inductor 2r2

Hello everyone. So i bought a new inductance and it looks fine. I also soldered it.

The problem was not that. There is a mosfet just above that inductance which is shorted.

I tried continuity mode with multimeter on that mosfet and gate and source are connected.

This doesnt mean the mosfet is broken inevitably right?

It could be some capacitators around?

How should i test them?

First i see many capacitator which could be also resistors (no marking on them).

How can i understand if they are capacitators or resistors?

And how can i understand if they are failing?

Thanks in advance, im a newbie, but i found the area where the short is!

[mon2]

Re: Asus sf530f and Inductor 2r2

mosfet and gate and source are connected.

Remove all power -> meter in resistance mode.

If the resistance between gate & source is a low resistance value, then yes, the mosfet is shorted and must be replaced.

What are the markings on the topside of the mosfet?

What is the resistance value and the meter scale used for the testing ?

[edith]

Re: Asus sf530f and Inductor 2r2

https://ibb.co/Z6NbybW

This is the schematics, the part regarding the mosfet is circled in red.

I measured the resistance between gate and source and its around 1 Ohm.

My multimeter is an autoranging from Wurth, like this

https://nautichandler.com/en/2236-wu...ultimeter.html

So do u think its 100% sure its mosfet and no some capacitators that are shorting the mosfet?

Also the marking on the mosfet is M3092M 84687E

[mon2]

Re: Asus sf530f and Inductor 2r2

Can you attach the pics to your post? Outside links expire.

[edith]

Re: Asus sf530f and Inductor 2r2

Here the mosfet schematics!

[mon2]

Re: Asus sf530f and Inductor 2r2

With flux, remove this mosfet and check the resistance again of the same pins but on the logic board pcb pads.

Do you see the same resistance?

You can also measure the resistance of the removed mosfet while it is on your work table to confirm it is shorted.

[edith]

Re: Asus sf530f and Inductor 2r2

With flux, remove this mosfet and check the resistance again of the same pins but on the logic board pcb pads.

Do you see the same resistance?

You can also measure the resistance of the removed mosfet while it is on your work table to confirm it is shorted.

Thanks for your patience!

I'll do it, and i will come back

[edith]

Re: Asus sf530f and Inductor 2r2

I just removed the mosfet. On pads there is no resistance.

The mosfet itself gives open line when i measure resistance after being removed.

Now im confused.

Btw the first mosfet on the main power line has right input but no output.

So i inject current, and thats how i found the mosfet we were discussing in the previous replies.

[mon2]

Re: Asus sf530f and Inductor 2r2

Is your meter auto-scaling or manual select for the resistance scales?

Post a pic of the meter scale used for this measurement.

Do you see 'OL' on the meter face during this test? This means over limit and the next scale should be used.

[edith]

Re: Asus sf530f and Inductor 2r2

Yes sure, pic of the measure on the removed mosfet?

[mon2]

Re: Asus sf530f and Inductor 2r2

Yes and also the meter setting / scale used for the testing.