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
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.
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.
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.
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I have found many LCD high voltage transformers problem are due to increase in resistance in secondary winding in one of the transformers. Note: A slight different in …
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shutdown or to have dim display problem. Basically the high voltage transformer can have four types of problems such as: 1) Open circuit especially the secondary winding How to …
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I have found many LCD high voltage transformers problem are due to increase in resistance in secondary winding in one of the transformers. Note: A slight diferent in resistance reading is …
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The CCFL requires a high voltage AC supply for operation. Typically, over 1000 volts RMS is required to initiate lamp operation, with sustaining voltages ranging from 200VAC …
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A low-loss ferrite and a new-shape core give rise to a super compact and high-output inverter transformer (6mm high*) suitable for designing narrow and flat inverter units.
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How To Completely Test LCD Inverter Transformer I have found many LCD high voltage transformers problem are due to increase in resistance in secondary winding in one of the …
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This application note describes how to use the Agilent N6700 Modular Power System (MPS) to test the backlight inverter of a Liquid Crystal Display (LCD). Testing the …
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Testing HV Transformers from LCD TV inverter boards In this Article I will show you how simple it is to check the HV (high voltage) transformers found in the majority of LCD TV inverter circuits.
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