In a message dated 5/22/02 6:32:20 AM, [EMAIL PROTECTED] writes:
<< ... Someone suggested it could be the inverter board. Could someone tell me what an inverter board does? ... >> "Inverter" is an electrical "word of art" for a device which can change one voltage, usually lower, into another voltage, usually higher. The LCD needs a higher voltage than is otherwise available from a Mac's battery, hence the use of an inverter to develop the higher voltage. A typical switching power supply, such as that used in desktop Macs, is actually composed of two distinct sections: a converter, and one or more inverters. The converter changes 100-240 volts, 48-62 Hertz alternating current (ac) into approximately 350 volts, pulsating direct current. This is then stored in a bulk storage capacitor or capacitors for use by the inverter(s). This dc is then sent by the inverter or inverters where is is changed: 1) to very high frequency ac, 2) to a very low voltage ac at this very high frequency, 3) rectified so as to become low voltage, pulsating dc, and, finally, 4) smoothed to eliminate the pulsations, so as to become low voltage dc. The desktop's motherboard and other devices then utilize the smoothed, low voltage dc for many functions. -- PowerBooks is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> PowerBooks list info: <http://lowendmac.com/lists/powerbooks.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/powerbooks%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
