If the resistor is a NON Carbon film (most are these days) its got a spirally
nickel band from one end of the leed to the other under the color bands


What happens when a resistor overheats and burns up, is usually the metal Spiral opens up approximately dead center.
1. Carefully scrape the burnt coating off the surface & you will see the spiral.  

2. Measure from each side of the break to the end leed with an ohm meter.   

3. Add up the 2 values & that's about the 'ball park' of the original value.       

 Some Technicians have reported to be able to have dropped a solder bead between the break, forming a conductive junction, and measure between the the original 2 spots to get the resistor value.

This Information Originally Supplied from: Sci.Electronics.Repair


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