hi guys, actually pls. help me how to use a variac transformer.... my fellow friends told me that when I will service a tv & using variac transformer I must first unsoldered the regulator ic or take it out of the circuit & then use the variac transformer.

My questions is there another method in using this variac trnaformer? thanks, pls. post thanks :cry:

 

It's rare to use a varactor on TV repairs these days, I can't remember the last time I used one. Generally they were used to bring the mains up slowly, so you could take measurements before things went BANG!.

Modern sets use switch-mode supplies with multiple outputs, so a variac isn't really any help.

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On the other hand, an isolation transformer used to power the set under test is a good idea since most new equipment these days eschew a power transformer for a lighter, cheaper and more-efficient switcher with no mains isolation.

Dean

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Dean Huster, Electronics Curmudgeon
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).

R.I.P.