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Check Capacitor C5 (a black, 680uF 20V radial model) for burn marks, bulging etc.
If it is defective, desolder it and then discharge it with a suitable resistor. (Not needed if unit has been unplugged for 3 days).
Replace it with a similar value cap, such as a 25V Rubycon. Note the original was a cheap "LM" brand model. (See photo showing board with replaced cap.)
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