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start surge of old television

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Posted by andy on July 21, 2009, 7:58 pm
we have an older sony trinitron (little over 24" size) tv

it's connected to a UPS unit to protect it from spikes, brownouts and blackouts

the UPS has a LCD display that shows total draw, amps, watts, time remaining,

when I turn on the tv, it draws for a second or two over 600 watts and then
settles to
77-79 watts

that appears way over normal?

Posted by z on July 21, 2009, 8:03 pm

My old sony computer monitors (using trinitron tubes) used to degause at
startup every time.. that can spike pretty good.  So if its doing that +
the regular startup that could pull quite a bit of juice.

Does the screen do a little shake or make a SPRONG noise at startup? Sony
was always anal about degausing as I recall -- which makes you sure the
picture free from residual electromagnetic influence  (and those old sony
monitors were SUPER at color reproduction and quality).


Just a guess


Posted by vaughn on July 21, 2009, 8:07 pm

   The only "surge" from something like that should be from the power supply
filter capacitors charging.  A 600-watt surge would be about 5 amps.  That
is on the high side of what I would expect, but not impossible.


Posted by Neon John on July 21, 2009, 8:39 pm
 On Tue, 21 Jul 2009 16:07:53 -0400, "vaughn"

No.  What the other poster said is correct.  It is the degaussing coil
firing.  There is a PTC thermistor in series with the degaussing coil.
It takes a second to warm up, during which the coil gets full line
voltage.  Then the thermistor goes high resistance and the coil is
powered down.

The set doesn't need degaussing every time.  In fact, it usually only
needs it after being moved.  If the degaussing process interferes with
the inverter (as it did in my motorhome), the PTC thermistor can be
replaced with a momentary contact switch.  Push the button to degauss.


Posted by z on July 21, 2009, 9:02 pm

Yeah -- A lot of monitors/CRT's had manual degause but Sony always fired
off every time at startup as I recall.  Used to kind of annoy me too


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