Reply To: Hell Worl – One Display LED Out

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#28877
Windell Oskay
Keymaster

A bad LED display is possible but unlikely. You can try swapping two of the LED displays — carefully — to verify. If the entire digit is out, the most likely situation is that transistor Q1, which turns on that LED display, is not turning on. Check soldering and orientation of Q1, as well as RP6 and U5. Check with the schematic if you need further reference for what’s what.