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lost an resistor, how can i find the value for a new one?

post #1 of 16
Thread Starter 
a guy desoldered an resistor from the motherboard of an laptop..and he lost the resistor. Now i need to know how can i find the value of the resistor, if is an resistor..any idea? i can post some pictures if you need..

The laptop still work, but the Keyboard/mouse dont work, keyboard is only functional at first 10seconds that i turn the computer on. Even with a mouse in PS2 dont work...

any help i appreciate.
post #2 of 16
What computer are we working with?
#well
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Lenovo L530
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#well
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post #3 of 16
Thread Starter 
i forgot the details it´s an toshiba S1710 (pentium 600mhz, 168mb of ram, etc) i know thats an old laptop, but it was working well..

later i´ll post an photo of the motherboard..

thanks.
post #4 of 16
does he know what it looked like ?

usually PCBs use alot of the same resistors , try another one that is commonly used
    
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post #5 of 16
here's what i would do

make sure you have a few hours of spare time.

carefully map out the circuitry and figure out how much voltage is needed at the certain locations where things dont work (electrically near lost resistor)

calculate how much resistance is needed to give proper voltage and/or current to area using kirchoff's and ohm's laws.

then get an appropriate resistor to solder


or


just do what born2killu said
    
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post #6 of 16
Thread Starter 
i dont know the resistor..

suppose we have a line of resistor´s:
1 (the first)- is missing
2- it has a kind of lines
3-has the number 202
4-it has kind of lines
5-has the number 750

i dont know how to explain better..sorry
post #7 of 16
Quote:
Originally Posted by casser View Post
i dont know the resistor..

suppose we have a line of resistor´s:
1 (the first)- is missing
2- it has a kind of lines
3-has the number 202
4-it has kind of lines
5-has the number 750

i dont know how to explain better..sorry
What are the colors of the resistor bands?
http://www.ece.unb.ca/thesis98/ee4000aj/Resistor2.html
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post #8 of 16
Thread Starter 
sorry, i´m very noob in electronics..



the picture dont have much quality, but i think it show the problem..

any help i´ll appreciate.
post #9 of 16
Oh, you need "Surface Mounted Resistors". You need to find a picture of another one to find the rating required. Also, your transistor still looks messed up.
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post #10 of 16
That case is also common for capacitors, so it could be either a cap or a resistor. You may be able to find a technical manual on the interweb for that model laptop.
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