How many LED lights can a LCD inverter read?
The tester could read up until 2 or 3 LED lights only. However, if the LCD inverter has more than one high voltage transformer then it would be easy to judge the result (comparison test). You can use the comparison method on the two transformers and locate the faulty one
What are the problems of a high voltage transformer?
Basically the high voltage transformer can have four types of problems such as: 1) Open circuit especially the secondary winding 2) Shorted in secondary winding 3) Increase in resistance in secondary winding 4) Breakdown when under load Note: The primary winding seems to be quite robust and rarely give problem.
What is the function of LCD TV/monitor high voltage transformer?
The function of LCD TV/Monitor high voltage transformer is to produce high AC voltage (from few hundreds to more than a thousand AC volt) to light up the CCFL backlight. If this transformer have problem it will cause the LCD screen to light up for a second and then shutdown or to have dim display problem.
What is a resonant magnetic high voltage transformer?
The final transformation is the transfer of me-chanical energy back into electrical energy. This is calcu-lated in a similar fashion to the input side. Resonant magnetic high voltage transformers have an electrical Q of between 20 and 30. The equivalent for the piezoelectric transformer is its mechanical Q, which ap-proaches 1,000.
How many LEDs will a high voltage transformer light up?
For a much bigger high voltage transformer you can expect at least 4 LEDs will light up. If the tester did not light up at all means the secondary winding is shorted. Note: You also have to take note that a slighlty small high voltage transformer secondary winding may not be able to read by the Blue Ring Tester.
What are the resistances in a transformer model?
The resistances in the model are a function of the mechani-cal QM and Q of the material at resonance and will be calculated later. The transformer ratio, N1, can be thought of as the ratio of electrical energy input to the resulting mechanical energy output.
AN81
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AN81
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