Follow these instructions to get your device  back:

1. Check the fuse 
bottom view of WBD-111
Replace if it is burned (1A) SIBA P/N ESF1.0-SMD.

2. Might be damaged diode bridge (4 pins) and/or voltage supressor (2 pins)
top view of WBD-111

Replace diode bridge with new one (1.5A / 100V) Fairchild P/N DF01S
Replace voltage supressor with new one. Fairchild P/N SMBJ20A

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