Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default Crackling on TVs

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

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sofie
 
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Default Crackling on TVs

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

electricitym
- - - - - - - - - - -



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



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Shoreline Electronics
 
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Default Crackling on TVs

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)

========================

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



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Frank
 
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Default Crackling on TVs

1. 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).

2. 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

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



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Dave D
 
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Default Crackling on TVs


"Frank" wrote in message
...
1. 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).


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

Dave




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