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A cable tester is an electronic device used to verify the electrical connections in a cable or other wired assembly. Generally a cable tester consists of:
1.A source of electric current,
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Delta Electronics said that the use of LED light source eliminates the traditional projector's bulbs, color wheel and shutters, but how to make the LED and DMD (digital micro-mirror components) closely match to produce high image quality is the biggest Technological breakthrough. 
2.A volt meter,
3.A switching matrix used to connect the current source and the volt meter to all of the contact points in a cable.
In addition to these parts a cable tester may also have a microcontroller and a display to automate the testing process and show the testing results.
Topic: Application of Delta Electronics at the International Consumer Electronics Show (IFA) in Berlin, Germany, to showcase the industry's first high-definition LED home theater DLP projector, working with Texas Instruments and Luminus Device, using PhlatLight LED technology With a resolution of 1080p for Full HD, the life of the LED module is about 20,000 hours under normal use.