Checking the liquid crystal display. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Checking the liquid crystal display. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Radio amateur designer

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Before installing a digital LCD in the design, it is advisable to check the serviceability of all elements of all its categories. This work cannot be done with an autometer. How to be?

I offer a very simple and reliable method for checking LCD elements. It is necessary to take any two conductors 500 ... 700 mm long with good insulation and twist them into a cord with any pitch. Then, a phase output is determined in a power outlet (220 V) and one of the wires of the cord is connected to it: the second end of this wire is securely insulated.

Any end of the second wire of the cord is touched alternately with the outputs of the indicator elements. If the element is OK, it turns on. At the same time, the indicator must be held in the hand, without touching the pins with your fingers.

Interestingly, the same effect can be obtained by touching the terminals of the indicator with a cold tip of the "Moment" soldering iron (without pressing the "Heat" button) connected to the network.

Author: A.Murzich, Kirovsk, Luhansk region, Ukraine

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