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Message: <blockquote data-quote="laal" data-source="post: 8736115" data-attributes="member: 94459">How Do LED light bulbs works on Mobile Phone CircuitAn LED - <a href="http://cellphonerepairtutorials.blogspot.com/2010/04/how-to-identify-diodes-symbols-and.html" target="_blank">light emitting diode</a> is used to illuminate <a href="http://cellphonerepairtutorials.blogspot.com/2010/05/how-to-identify-spare-parts-and-how-it.html" target="_blank">keypads keys</a> and <a href="http://cellphonerepairtutorials.blogspot.com/2010/05/how-to-identify-spare-parts-and-how-it.html" target="_blank">LCD screen displays</a> on all mobile phones handsets. It is being controlled by a voltage or current draws on its terminal leds.a picture below is an <a href="http://cellphonerepairtutorials.blogspot.com/2010/04/introduction-on-how-to-read-mobile.html" target="_blank">Schematic Diagram</a> that tells us how does the LED circuit works on cellular phone whole circuitry.<a href="http://1.bp.blogspot.com/_8JZhVVmpICU/S-7ysC9uF1I/AAAAAAAAAXE/rR_giKFje3c/s1600/Led%20circuit%20diagram.jpg" target="_blank"><img src="http://1.bp.blogspot.com/_8JZhVVmpICU/S-7ysC9uF1I/AAAAAAAAAXE/rR_giKFje3c/s400/Led%20circuit%20diagram.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>On schematic diagram  we notice that the LEDs is driven by an LED driver chip's, and an Switching Control  circuit that also being packed in a chip. The LED driver is being used  to stabilized the voltage and current and do take control on engaging ON  and OFF status of an LEDs to light up or not.It also drives  the amount  of  brightness or dimming status of the LEDs  by applying Pulse Width Modulation signal from the Switching control  circuit.The block diagram below interpreted a component and section or parts of  an LED circuit to work during application process.The Switching control circuit feeds and release a Pulse Width Modulation Signal (PWM)  to switch and light up the LEDs light bulbs. A pulse width modulation  signal is a type of digital frequency signal range up to 1khz to enable  and implement to take control of  LED brightness.Once that certain signal is being received by the LED driver, the LED  driver now will engage and release the voltage or current that being  feeds up from the mobile phones battery supply voltage;The output voltage release by the LED driver is the one that draws the LED light bulbs to light up. <a href="http://4.bp.blogspot.com/_8JZhVVmpICU/S--KTCi4EtI/AAAAAAAAAXg/_clUP8bz-uE/s1600/Led+circuit+block+diagram.gif" target="_blank"><img src="http://4.bp.blogspot.com/_8JZhVVmpICU/S--KTCi4EtI/AAAAAAAAAXg/_clUP8bz-uE/s400/Led+circuit+block+diagram.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>LED drivers is a high frequency, synchronous boost converter with   constant current output to drive up to 5 white LEDs. This device circuit   is designed  for maximum safety,  it integrates overvoltage  and short   circuit protection when the output is being shorted to the ground.   Meaning this chips circuitry will not easily  breakdown for it is   designed to protect when short circuit happens.like for example,  the two LED light bulbs commits short circuit to its terminal In mobile phones application methods; the switching control circuit   that release pulse switching signal is also being synchronized  programmed by the the  application processor (CPU) to engaged a full  control on how and which  proper situation that the LED will be switch  to light up or not. like for example the LED will only switch and light up, if the handset  is being in used and remain off if the handset is not in used. <a href="http://3.bp.blogspot.com/_8JZhVVmpICU/S-73jOlsjDI/AAAAAAAAAXM/vcCs8lNIw9s/s1600/LED%20layout.jpg" target="_blank"><img src="http://3.bp.blogspot.com/_8JZhVVmpICU/S-73jOlsjDI/AAAAAAAAAXM/vcCs8lNIw9s/s400/LED%20layout.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>The  above image is an example of the LED circuit, how those particular  stages and components being mounted on a phones circuits. Note that the  LED driver and switching control circuits is being packed into an  Integrated Circuit or ICs. To all beginners: A bunch of simplified STEP By STEP Procedures On  Troubleshooting LED Problem issues on various mobile phones  product  will be Posted Here Later.. Just keep on visiting this blog more often.</blockquote>

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