crwdns2935425:02crwdne2935425:0
crwdns2931653:02crwdne2931653:0
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Use a battery or a cell with connecting wires and apply them to the exposed solder ends on each LED.
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The LED which doesn't lights up is detected as the faulty LED.
crwdns2944171:0crwdnd2944171:0crwdnd2944171:0crwdnd2944171:0crwdne2944171:0