BenQ PB8250 - XGA DLP Projector, Service Manual

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The Image Processor also known as “Scaler” , which indicate its main function , expand or downsize
the digital picture from ADC to a fixed size digital image output .
The CPU which control the whole system is embedded inside the Image Processor , there is also a
Real Time Operating System which incorporates with the CPU as hardware layer interface .
The EEPROM stores the system information such as brightness , contrast …which ensure the system
operates under the most user friendly circumstance .
The Flash memory stored the Software Program which control the system , the CPU will read the
Flash as its execution command .
Block Diagram
Below is the simple block diagram of PB8250 Main Board .
As the diagram shown above , here is the function of every discrete blocks .
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D_SUB input
Analog RGB data input , the standard maximum analog input resolution is SXGA .There also
some interface signals from the VGA cable , they are
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