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![Polarity and existence of clear parts](https://images.squarespace-cdn.com/content/v1/55c65f51e4b0960d6d1c80c6/1441395840279-8HY6ZDWAWMIX98DHC397/image-asset.jpeg)
![Polarity and existence of electrolytic capacitor](https://images.squarespace-cdn.com/content/v1/55c65f51e4b0960d6d1c80c6/1441395879202-I5SG0DDGPHZ3FVX9ZOT5/image-asset.jpeg)
![Polarity and existence of diode](https://images.squarespace-cdn.com/content/v1/55c65f51e4b0960d6d1c80c6/1441395915792-NXJGR8NN7DI8R9KL6I8M/image-asset.jpeg)
![Existence and banding of resistors](https://images.squarespace-cdn.com/content/v1/55c65f51e4b0960d6d1c80c6/1441395953530-I1RW8OEVDUM4X94A733G/image-asset.jpeg)
![Existence of parts](https://images.squarespace-cdn.com/content/v1/55c65f51e4b0960d6d1c80c6/1441395977226-BE3T5XGEUBV0764IYQI9/image-asset.jpeg)
![Polarity, existence, wrong pin number of IC](https://images.squarespace-cdn.com/content/v1/55c65f51e4b0960d6d1c80c6/1441396113676-PBCTU0JLJMMQWBBEMN0Q/6.jpg)
![Wrong connector color](https://images.squarespace-cdn.com/content/v1/55c65f51e4b0960d6d1c80c6/1441396113773-5TW8K76EY609GTNOO0GN/7.jpg)
![Polarity, existence, wrong pin number for connectors](https://images.squarespace-cdn.com/content/v1/55c65f51e4b0960d6d1c80c6/1441396113805-DU80QY9F7BHF2QJWQ9OB/8.jpg)
![LED color and brightness](https://images.squarespace-cdn.com/content/v1/55c65f51e4b0960d6d1c80c6/1441396113867-9A5M6IU16C2GS5CXTWEL/9.jpg)
![Existence of parts with the same color on white boards](https://images.squarespace-cdn.com/content/v1/55c65f51e4b0960d6d1c80c6/1441396113914-77LEMKTA8THU7X4TCUD6/10.jpg)
![Existence of jumper leads](https://images.squarespace-cdn.com/content/v1/55c65f51e4b0960d6d1c80c6/1441396113964-TJK678CITNZGZ42YGI79/11.jpg)
![Excessive inclination of parts](https://images.squarespace-cdn.com/content/v1/55c65f51e4b0960d6d1c80c6/1441396114009-SXR26MDHPPAGB8M73P38/12.jpg)
![Brightness and lighting failure in each segment](https://images.squarespace-cdn.com/content/v1/55c65f51e4b0960d6d1c80c6/1441396114091-445FDQK07QVBC9YWW430/13.jpg)
![Screw existence](https://images.squarespace-cdn.com/content/v1/55c65f51e4b0960d6d1c80c6/1441396114116-X34GNNGVD6T928WY72AO/14.jpg)
![Polarity and existence of white photo couplers](https://images.squarespace-cdn.com/content/v1/55c65f51e4b0960d6d1c80c6/1441396114216-51XL69LDRBQ14O13M885/15.jpg)
Polarity and existence of clear parts
Polarity and existence of electrolytic capacitor
Polarity and existence of diode
Existence and banding of resistors
Existence of parts
Polarity, existence, wrong pin number of IC
Wrong connector color
Polarity, existence, wrong pin number for connectors
LED color and brightness
Existence of parts with the same color on white boards
Existence of jumper leads
Excessive inclination of parts
Brightness and lighting failure in each segment
Screw existence
Polarity and existence of white photo couplers
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