You can also sense the voltage drop across the LED. If the LED has failed open, the voltage will go to the power supply voltage. If the LED failed short, the voltage will go to zero.
As some people have suggested, you can sense the current goes through the driver outputs, by using a current sensor, or by measuring just the voltage at the driver outputs.
scan leds one by one. just check the drop across the "current limit resistance"(the one in series, with all leds) which ever led shows VCC as drop, its disconnected
scan leds one by one. just check the drop across the "current limit resistance"(the one in series, with all leds) which ever led shows VCC as drop, its disconnected
The TLC5940 is a 16-channel constant-current sink LED driver.
The TLC5940 features two error information circuits. The LED open detection (LOD) indicates a broken or disconnected LED at an output terminal. The thermal error flag (TEF) indicates an overtemperature condition.