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ViewSonic Corporation Confidential - Do Not Copy PJ503D-1
Level 2 Circuit Board and Standard Parts Replacement
Overview
The Projector consists of the DLP projector controller, Lamp controller, Power supply system,
and the system cooling controller. The DLP controller captures the digital PC data and video
data and converts them into the DMD display device. The lamp controller controls the lamp’s
power and synchronizes its frequency with color display sequence. Power supply unit
controls the AC line power factor and converts primary voltage to secondary low voltage for
digital board. The system cooling controller drives the airflow to cool the lamp’s heat and
electrical component’s heat.
Hardware Architecture
The Projector consists of the Source board, Main board, Keypad board, Fan board, EMI
board, PFC board, Ballast board, Door interlock switch, Color wheel index sensor board,
and the Thermal break sensor board. Please see Figure 1.
Source Board consists of audio phone jack, video RCA jack, S-video mini-DIN head, and
USB head. Main Board consists of RGB A/D conversion, Video decoder, DLP ASIC, Flash
and RAM, Motor driver, DMD Reset driver DAD1000, and IR receiver. Keypad Board consists
of 8 keypads and 3 twice-color LEDs. Fan Board consists of DC/DC converter, Thermal Break
circuit, Blower Fan driver circuit, Rear Fan driver circuit, and the temperature sensing circuit.
Power supply circuit consists of AC line EMI filter, Power Factor Correction circuit. Ballast
Board consists of Lamp synchronization circuit, Lamp lit feedback circuit, and Lamp power
control circuit.
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