Question about HP Pavilion F1703 17" LCD Monitor
In a CRT type monitor/TV the push-pull transistors are used in the vertical output section to provide both poistive and negitive signal amplification. By using a NPN and PNP transistor set you can amplifiy a signal that goes positive and negitive. A NPN uses the positive portion of the input signal and then amplifies that signal (pushing it to a higher positive signal level)(PUSH). The negative portion of that same signal to sent to a PNP transistor to amplify the negative to a more negative value PULLing the signal lower/more negative). The out puts of both transistors are combined providing a PUSH-PULL transistor set.
Now days the use a chip with all the transistors and a lot of the associated components inside. The LCD I worked on used FET's N-type and P-type (negative and positive).
I hope this helps.
Posted on Aug 26, 2008
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Posted on Jan 02, 2017
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