What is this on my motherboard, and where to buy?

I have some components on my motherboard that look burned and warped.
(notebook is dead, bad motherboard).

Anyway, I attached a photo, maybe someone could tell me what they are (circled in red)?

Where could I buy some of these to replace the bad ones?
Would a good electronics store have them?

Could I test them with a DMM, how?

Thanks.

 

The text on the components is blurry - have you tried a google search with those terms?

 

Those are ferrite cores. They help maintain sufficient voltage to the capacitors.

 

Thanks, that makes perfect sense.

Only problem is this:

from:
http://www.mikesarcade.com/cgi-bin/spies.cgi?action=url&type=info&page=psrepair.txt

So it might be a bit hard for me to find a replacement.

I may have to try the rewind trick.

Thanks again Soviet Sunrise

 

http://www.alliedelec.com/
http://www.digikey.com/


et cetera......

 

Thanks for the links.

So I'm just going to crack one open with a hammer and see if it looks bad inside.
Also I will test it to see if there is a bad connection.

 

Got one of them open, seems it's just a coil covered with ferrite.
Not possible to rewind this type.

So I will just go out and get the replacements.

 

Is another name for them inductor?

EDIT: would these work:
http://www.jaycar.com.au/productView.asp?ID=LF1102&keywords=INDUCTOR&form=KEYWORD

 

On motherboards, the ferrite inductor, or choke, is what we call the entire piece itself consisting of the coils, the ferrite core, the casing, and the leads.

 

Last question, what do I do with the one that has three legs?

I'm sure it's a bad one, but I dont see any with three legs for sale.
Should I just replace that one with a pair?

 

Well since the parts are so cheap, I will just buy a few and see what happens.
I'll have results soon (hopefully).

 

Use a multimeter to see what connects to what. And yes, they are inductors. I'm not real sure how one can go bad other than through physical damage though. How did you determine that they are bad?

 

Two of them had black legs that were also bent.
Looked bad to me.

I have pulled a few of the following of an old motherboard:



Are these also inductors?
Are they compatible?

 

Yes a ferrite core is a type of inductor. The guage/specs of the wire have to be the same.

 

Well, they can't possibly have fried themselves. I really doubt anything you can do will bring that motherboard back to life. If they got zapped enough to burn out their legs, something had to have done it that is causing the problem to begin with, and it would take out more than that with it.

Yes those are inductors. Who knows how much inductance they have?

 

I'm going to buy a new motherboard, I just missed out on a good one that went for $50 on ebay (problem was that the seller didn't make it so that I could bid since I'm from australia and the listing was to US only, even though I sent them a message and they agreed to let me bid).

So I just want to play with this motherboard while I look for a new one. Sometimes you get lucky and things just work.

I'm going to swap out the bad inductors either today or tommorow, I'll let you know the results.

 

Update:
I tried to boot with the new inductor, it gave the the same results as before.

I guess it has something else broken. At least I had fun.

 

Update #2:

I replaced the inductor that has three legs, with two inductors.

Now there is a change. When I connect the power cord to the motherboard (no other parts connected) the power light blinks.

This is either bad, or it is really good.

I will give more results soon after I finish testing.

 

While testing, if your system supports BIOS Recovery Mode, try that too.

I've been digging into how this works, it may not help you, but it can't hurt.

 

What was the exact fault with the motherboard before you started changing components?

 

This is where the advice of someone like CrazyCanuk or KTRON would be handy.

 

K-Tron's banned i thought?

 

When I turned on the notebook there was nothing, no screen, no fan, nothing except for the on light and power light.

But when I went to BIOS recovery mode, the fan spins up very fast and there are beeps. When I put in the floppy with the BIOS files, it read the floppy and then just restarts. Or if I use another BIOS file, it reads the floppy and then blinks an orange light and then restarts.

Doesn't fix anything though.

The notebook was apparently dropped, then worked for a few days and then died.

I tested all parts (because I have a similar notebook), the only thing that seemed to not work was the motherboard.

I know I should just buy a new one, but finding it cheap is hard to do.
Some guy on ebay wants $230US (delivery inc.) for a refurb one.


Now it turns out I made a mistake yesterday, the inductor with three legs actually had a GND leg. And I was shorting out the board, hence the power light blinking.

It seems to me that the board is close to life, but just had a small problem.
I will keep playing with it until I find a cheap one on ebay.
No chance anyone here is selling a motherboard for a tecra M9?

I'm actually thinking of using a motherboard from another 14.1' toshiba notebook.
I just dont know if any other model would fit. I guess I should look out for a tecra M10 motherboard.

Thanks for the help

 

Sounds like you got the CPU working, at least in 16bit 'Flat Mode'.

Best guess, GPU's dead, maybe some other Sub-Systems too, hard to say what went bang.

Try to boot a MINIDos disk, see if Ctrl+Alt+Del restarts it.

Does the LoBo have Old School Serial Port?

 

Thank god for that, I though it was dead, and I bought a new one anyway.

Do you know of any way to disable the GPU, I could use an external one DIY vidock style.

Doesn't boot from USB, floppy, DVD or HDD.
Ctrl+Alt+Del has no effect.

Yes it does.

 

From that it sounded like it was working in Recovery Mode, maybe not.

Try to Boot Mini Dos, press enter 4 or 5 times then Ctrl+Alt+Del.

As the System has a Serial port, odds are it Redirects Bios Output to that port, it's some real old stuff, I'll have to look up how it works.

If you have another PC with Serial and a Cable, you can get to the Bios Setup or Boot Dos/Linux, in Dos or Linux you could find/disable bad devices.

If Mini Dos won't work, I can look into some lower level stuff. May not do any good, your LoBo may just be FUBAR, but I'm working on a bootloader that can be loaded from the Recovery Mode of Phoenix Bios, so it's worth a bit of time to me.

 

Ok, I will try that now.

Just in 30 mins because I need to put the thing back together.

BTW, I dont have another notebook or desktop with a serial port. This is the only one that has it.

 

Your bios may send POST codes to the Serial Port, but without another one, it's not of much use.

Before I said 16bit Flat Mode, Should have bean Real Mode.

 

Ok, thanks for the help but I think I just killed it off now.

Plug it in, orange light flashes. Probably because I shorted it out yesterday.
This thing is dead.

I'm just going to look for a motherboard.

 

Orange light flashing:

from here:
http://www.hardwareanalysis.com/content/topic/51345/

I get 10100010 = A2

A2h
1R8-E1V voltage is not more than 1.53V when the computer is booting up.

So that is the problem, and I guess it's FUBAR.

Even if I fixed this problem that I made, I would still have the original problem to deal with. Definatly not worth the time.

 

Sorry to hear bud. Better luck next time.

 

Well I just got my new motherboard. I still have no luck.

Here are the only parts left that can be faulty:

1. Switch PCB (most likely since when I plug in the AC power cord the notebook powers on without me pressing anything).

2 .Keyboard.

3. Screen.


But this does mean that I may now have 2 working motherboards.

I'm going to try to get a net switch PCB. I hope this works.

It's going to be great having a second working motherboard to mod.

But I feel stupid now. Instead of wasting time and money on new parts (motherboard and CPU) I could have bought a cheap $8 switch PCB and it would have all been fine.