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NotTaR of Television Sets : Memory chips in TVs
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(From: Mark Zenier (mzenier@eskimo.com or mzenier@netcom.com).)
Actually, they are EEPROMs. A modern TV has integrated the circuitry
so that the microprocessor that controls it also sets the various
adjustments like vertical height and other characteristics. The same
memory that knows what channels are valid and what the brightness and
other user adjustable settings are is used for factory adjustments that
are set when the TV is first turned on. It's a lot cheaper to use the
remote control signals that are already there than add a handful of
trimmer resistors.
For service purposes there is often a magic key sequence used with your
remote control to access a service page in the on screen display than
can change these. Since you can easily set something that could fry the
various high power deflection circuits, getting a little too curious can
void your warranty, and toast your set.