ViewSonic PJ755D Service Manual - Page 23

Main Procedure Description, No Power All LEDs are off with Power Cord plugged - troubleshooting

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3-2 Main Procedure Description A. Power Troubleshooting 1.) No Power (All LEDs are off with Power Cord plugged) - Check the Power Cord. - Check the Lamp door. - Ensure the keypad cable is well connected. Judge - Change LVPS or Main BD 2.) No Light Lamp LED Indicator Failed (Lamp LED is red) - Check if all wires are well connected inside. - Check Lamp Module Temp LED Indicator Failed (Temp RED is red) - Turn on Main Power again. - Check Fan Module. - Check Thermal BD. - Check Thermal Switch. Judge - Change Lamp Driver or Main BD. B. Image Troubleshooting 1.) No image on the screen. - Ensure the signal cable and source are working fine. - Press “SOURCE” button to re-catch the signal again. Judge - Change Main BD or DMD BD or DMD Chip 2.) The image displayed with color issue - Ensure the signal cable and source are working fine. - Check if the I/O connector is loose or not. - Check Main BD if the image displayed without color abnormal issue when you input the signal with other ports. - Check Photo Sensor BD if the image displayed with color flicking issue. Judge - Adjust Brightness-R/G/B. *Note1 - Adjust Color Wheel index delay. *Note2 - Change Main Board. ViewSonic Corporation 3-2 PJ755D

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PJ755D
3-2
ViewSonic
Corporation
3-2
Main Procedure Description
A.
Power Troubleshooting
1.)
No Power (All LEDs are off with Power Cord plugged)
-
Check the Power Cord.
-
Check the Lamp door.
-
Ensure the keypad cable is well connected.
Judge
-
Change LVPS or Main BD
2.)
No Light
Lamp LED Indicator Failed
(Lamp LED is red)
-
Check if all wires are well connected inside.
-
Check Lamp Module
Temp LED Indicator Failed
(Temp RED is red)
-
Turn on Main Power again.
-
Check Fan Module.
-
Check Thermal BD.
-
Check Thermal Switch.
Judge
-
Change Lamp Driver or Main BD.
B.
Image Troubleshooting
1.)
No image on the screen.
-
Ensure the signal cable and source are working fine.
-
Press ±SOURCE² button to re-catch the signal again.
Judge
-
Change Main BD or DMD BD or DMD Chip
2.)
The image displayed with color issue
-
Ensure the signal cable and source are working fine.
-
Check if the I/O connector is loose or not.
-
Check Main BD if the image displayed without color abnormal issue when you input the signal
with other ports.
-
Check Photo Sensor BD if the image displayed with color flicking issue.
Judge
-
Adjust Brightness-R/G/B.
*Note1
-
Adjust Color Wheel index delay.
*Note2
-
Change Main Board.