Resistance Substitution Wheel
If you come across a board that have missing resistor or the resistor burnt beyond recognition, you can always use the resistance substitution wheel to locate the resistor value. Although it is not 100% accurate, at least it will give you some clues on what is the best value for replacement since you do not have any information about the missing resistor value. It can only support till 0.25 watt. Please click on the photo to visit the website.