I have the controller board from an Evaporative cooler. there is a 5 volt regulator on the board L7805cv. Connected to the Vin pin 1 is a resistor that has blown off it's outer layer and the value is unreadable (it measures 118 ohms). Across ground and pin 3 is a 4.7k resistor.
I have searched for a schematic for the controller board and of course came up with nothing. Any ideas on how I can guess the value of the bad resistor?
I'm going to pull the regulator and test it.
I have searched for a schematic for the controller board and of course came up with nothing. Any ideas on how I can guess the value of the bad resistor?
I'm going to pull the regulator and test it.
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