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RE: reduce heat in switching Power supply with half wave

Posted by budm (A) on July 5, 2007 at 21:20:58

In Reply to: reduce heat in switching Power supply with half wave posted by wlee on July 5, 2007 at 12:06:36:

you can reduce the load on the power supply by reduce the brightness, the inverter circuit consumes the most power in the LCD screen, which it nusually runs on 24VDC (inverts to AC at about 1200VAC to fire the CCFL lamps then drop down to about 700Vac), 12V on most LCD PC monitor and it is the one that fails the most. I have been repairing the LCD monitors for many years now and that is the most problem after about 3 years. The SMP has regulated output and it canusually handle the input as low as 80vac, some of them can handle anything from 80v to 250v, look at your laptop SMP.
At lowr voltage, it will need more current to keep the power the same, P= I*V, less current at higher voltage.
you van do a search about backlight inverter by typing in "backlight inverter"to learn more.

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