Question 2 broken resistors on Lenovo 90BF002DUK motherboard

[JFS2705]

Hi there,
I was removing the CPU cooler on my sisters old Lenovo 90BF002DUK motherboard (FM2+ socket) from a Lenovo h50-55 and i accidentally knocked off 2 resistors by the CPU. I am looking into getting the motherboard repaired but I am being told it will cost £90. I can replace the motherboard for less but i will require a new case because of incompatible pin layouts on the front panel connectors. I was wondering does anyone know if i may be able to get this done cheaper if possible.

https://imgur.com/a/QZc4uCQ

View: https://imgur.com/a/QZc4uCQ

 

[drea.drechsler]

Hi there,
I was removing the CPU cooler on my sisters old Lenovo 90BF002DUK motherboard (FM2+ socket) from a Lenovo h50-55 and i accidentally knocked off 2 resistors by the CPU. I am looking into getting the motherboard repaired but I am being told it will cost £90. I can replace the motherboard for less but i will require a new case because of incompatible pin layouts on the front panel connectors. I was wondering does anyone know if i may be able to get this done cheaper if possible.

https://imgur.com/a/QZc4uCQ

View: https://imgur.com/a/QZc4uCQ

Have you tried operating it yet?

They're not resistors but are capacitors... the RefDes' (C116 & C118) are the clue. Which is lucky since capacitors (like those) are most often used as noise-decoupling. I'd try using the board before committing to replacement or repair. It most likely will operate just fine.

 

[JFS2705]

Have you tried operating it yet?

They're not resistors but are capacitors... the RefDes' (C116 & C118) are the clue. Which is lucky since capacitors (like those) are most often used as noise-decoupling. I'd try using the board before committing to replacement or repair. It most likely will operate just fine.

I thought those were resistors and the capacitors. I thought capacitors looked like this.

https://imgur.com/a/8rfScUz

View: https://imgur.com/a/8rfScUz

and resistors looked like this

https://imgur.com/a/SjcEPgr

View: https://imgur.com/a/SjcEPgr

 

[drea.drechsler]

I thought those were resistors and the capacitors. I thought capacitors looked like this.

https://imgur.com/a/8rfScUz

View: https://imgur.com/a/8rfScUz

and resistors looked like this

https://imgur.com/a/SjcEPgr

View: https://imgur.com/a/SjcEPgr

The second pic are capacitors too and again, it's the RefDes' that are the give-away. Those are MLCC cap's (Multi-Layer Ceramic Capacitor) and have different construction and application from the electrolytic caps shown in the first picture.

There are many styles of capacitors with different form factors.

 

[JFS2705]

The second pic are capacitors too and again, it's the RefDes' that are the give-away. Those are MLCC cap's (Multi-Layer Ceramic Capacitor) and have different construction and application from the electrolytic caps shown in the first picture.

There are many styles of capacitors with different form factors.

Ah ok, I did not know that, so do you think it will be ok to leave the motherboard as is and not replace it/repair it?

 

[drea.drechsler]

Ah ok, I did not know that, so do you think it will be ok to leave the motherboard as is and not replace it/repair it?

Can't be positive, but I'd definitely give it a try. In that location they look like they're being used to decouple high frequency switching noise from Vcore voltage going to the CPU. They're probably redundant...there are usually a lot of them that designers scatter around on principle. They're cheap, easy to locate in a layout and are better off having too many than too few. So missing a couple probably won't matter.

In fact, if you look about the board you'll probably find more than a few locations where they decided to not install them. That's not uncommon as shaving cost during manufacture is always a way to get a bonus.

 

[punkncat]

I make the following recommend without actually knowing what the landscape is for refurbished office machines in your locale.

It's super easy finding sub $100 SFF office machines like Dell or HP with 2nd or 3rd gen Intel that would absolutely work circles around what that build likely is. I wouldn't repair it, I would replace it, if possible. Something like an OptiPlex.

 

[JFS2705]

Can't be positive, but I'd definitely give it a try. In that location they look like they're being used to decouple high frequency switching noise from Vcore voltage going to the CPU. They're probably redundant...there are usually a lot of them that designers scatter around on principle. They're cheap, easy to locate in a layout and are better off having too many than too few. So missing a couple probably won't matter.

In fact, if you look about the board you'll probably find more than a few locations where they decided to not install them. That's not uncommon as shaving cost during manufacture is always a way to get a bonus.

Ok, well after i knocked off the 2 capacitors I tested the PC out and i managed to boot in to windows just fine. I will install the new cooler tomorrow and see if everything works ok. Thanks so much for your help.