ViewSonic VX2262WM Service Manual - Page 18
Pwpc Board Block Function Description
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UPC - 766907303919
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4.3 PWPC BOARD BLOCK FUNCTION DESCRIPTION PWPC board combines to adapter and inverter, Adapter which commonly consists of bridge rectifier and filter, start circuit, PWM control circuit, protection circuits and convert to 16V, 5V,5.1V DC voltage by input 90V-240V AC voltage that provide power supply for each chips in the main board and inverter. Inverter is DC TO AC circuit. It changes the 16v DC of power supply to about 600-800v AC that drives the backlight. It mostly consists of starting circuit, PWM controller, DC changing circuit, LC surging circuit, output circuit and protection circuit etc. AC input EMI filter Bridge Rectifier and Filter Transformer Rectifier CMOS Lamp Start Circuit R904, R905, R906 PWM Control IC OSC and Output Circuit DC Convert Circuit Feedback Circuit Over Voltage Over Voltage Protect MOSFET Q804,Q809 16V CN902 5V 5.1V ON/OF PWM Control IC ON/OFF Control DIM ViewSonic Corporation - 18 - Confidential - Do Not Cop VX2262wm/wmp
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