Crackling on TVs

Any explanation for why there is sometimes a crackling noise when you first turn a television on?

high voltage start up (crackling) and automatic degaussing circuitry (whoosh) operating.

electricitym

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That's from the bag of potato chips your opening.

uhhg....couldn't resist!

-- ========================== Jeff Stielau Shoreline Electronics Repair

344 East Main Street Clinton,CT 06413 860-399-1861 860-664-3535 (fax) snipped-for-privacy@snet.net ========================

If you hear a 'boom' at the power up state, it's probably a VDR (Voltage Dependent Resistor) normalize the magnetic field in the CRT. (The cable that goes around the tube).

The cracling noises are static discharges. Absolutely normal at power up. If you then turn it off and back on, there will be less cracling noise.

Hope this opens up a new world for you :)

Frank

It's the degaussing coils causing a vibration at line frequency. The thermistor in the degaussing circuit (not VDR) makes no noise.

Dave