Circuit diagram

I need to repair a Toshiba Satellite M40.
The wireless has died and a component on the circuit board has " fried'
This is resistor R250.
I have the technology to replace surface mount components but do not know the value of this resistor.

It is in combination with D25 and is across the wireless KILL switch.
Any comments or suggestions as to the value of R250 would be greatly appreciated.

 

Could you not just read the value of the resistor? If it's surface mount then it should be written on, though you might have to use some sort of magnification to see it properly.

 

The monk is right...the value of the resistor will be printed on there somewhere. You should be able to see it with a sufficiently strong magnifying glass.

That being said though, if the resistor burned out than it burned out for a reason. Something else is most likely wrong with the board. Try repairing it but it might burn out again.

 

Thanks folks. However as I said it is "fried" and gone to powder.
So cant read it.I

 

I need to find out what value it was to find out what caused it. Will check with ammeter before replacing

 

are there not other R250s resistors on the circuit board?

 

R250 is a marking on the PCB indicating it is the 250th (note: different number can be given by designer if desired) resistor placed on the board by the designer (it's common to have these markings in silkscreen to aid in quality assurance, assembly, etc). That number says nothing about the resistor other than it's placement.

 

Thanks for all your posts.
From my experience with manufacturing etc. Each complete product will have a bill of materials. Each component, as you said will have a unique part number and position.
i.e R1,10 200 etc will be say 100 kohm.
C1 to C100 0.1 microfarad. etc
In this case R250 will be x ohms. But only one numbered R250.
Others of the same value will each have their own number . Only one of R250 will be on the board

 

Have you tried contacting Toshiba, it might be worth a shot. It is too bad that my M40 died about a month ago and i sent it to be recycled. The M40 is an old model, so the people who still own one are probably very few.

 

R250 is a drop in the bucket for a multinational company!! I will contact them but hey- don't hold your breath

 

I have an m40 but I don't think I have a working multimeter. If you want to tell me what to test I might go out and buy one, I need it anyway.

What is your exact model though? I think mines an s331 or something, there are different motherboard revisions for integrated and dedicated graphics.

This site is selling the schematic:
http://laptop-schematics.com/db/52/Satellite/

I think there might be a motherboard revision with SATA, and like I said there is one with dedicated graphics, a geforce 6600. Depending on how much they are it could be worth it to you.

 

You'd have to desolder the component, measure the resistance, and report back. Not fun .

 

Oh....... are you sure? That sounds like fun.

The thing is on its way out anyway, even more fun would be an MXM 2.1 motherboard to experiment with.