Testing The LCD High Voltage Transformer
If you already have a Blue Ring Tester I’m sure you have use it to test on the primary winding of switch mode transformer. The switch mode power transformer is under the category of step down transformer because the output voltages is lower than the input voltage. Simply connect the ring tester to the primary winding and check the result. The ring tester is designed to check on a transformer that have more winding. In other words it can’t be used to check on the secondary winding because secondary side have less windings.
Now, if you want to test on the LCD high voltage transformer then you have to test the winding at the secondary side and not the primary side. The reason for it is because high voltage transformer is under the category of step up transformer thus the secondary side have more windings than the primary side. Just use the ring tester and place it at the secondary side and read the result. For accuracy testing, remove the transformer and test it (off board testing).