Chiptronics

calculate resistor value in the laptop Motherboard

The 4-digit code used to mark the precise surface mount resistors . It is similar to the 3-digit code system before, the only difference is the number of significant digits: the first three numbers will tell us the meaning of digit lead resistance , and the fourth number will be a factor of 10 the number of latex (or how many zeros to add to the first 3 digits). Less than 100 ohms impedance are marked with the letter 'R' to indicate the position of the decimal point.
For example, 4-digit code:
4700 = 470 × 10 0 = 470 x 1 = 470Ω
or preserved 470 (unchanged top 3) and add 0 number "0" after 470 -> It is 470 Ω
2001 = 200 × 10 1 = 200 x 10 = 2000Ω or 2kΩ
or retain more 1 200 and the number "0" after 200 -> It was 2000 Ω
1002 = 100 × 10 2 (100) = 10000Ω or 10kΩ
or preserved 100 and add 2 numbers "0" after 100 -> It is 10000 Ω
15R0 = 15.0Ω