ViewSonic PJ755D Service Manual - Page 25

Change Main Board or Keypad Board., Sound Output With Noise. - remote

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Page 25 highlights

8.) The image displayed with line bar issue. - Check if the line bar issue that can be fixed by “Frequency” function of OSD menu or not. Judge - Change Main Board. C. Audio Troubleshooting 1.) No Sound Output. - Check if “Mute” function has been activated or the volumn is set to the minimun. - Ensure the signal cable and Source are working fine. - Use the new Speaker for the Sound output test. (Replace the speaker if the new speaker works fine with the unit.) - Check the Speaker wire that has broken issue or not. Judge - Change Main Board 2.) Sound Output With Noise. - Ensure the signal cable and source are working fine. - Ensure the volume has not been set to the maximum (Due to the output power of internal speaker is 2W only.) It might has the noise issue if the volume is set to the maximum.) - Use the new speaker for the test. (Replace the speaker if the new speaker works fine with the unit.) - Check if the speaker wire is broken or not. Judge - Change Main Board D. Remote Control Troubleshooting The OSD menu cannot show on the screen when you press the menu button on the remote controller. - Replace the new battery if there is no laser output when you press the laser button on the remote controller. - Replace a new remote controller if there is OSD menu showing on the screen when you press the menu button on the keypad. Judge - Change Main Board or Keypad Board. ViewSonic Corporation 3-4 PJ755D

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PJ755D
3-4
ViewSonic
Corporation
8.)
The image displayed with line bar issue.
-
Check if the line bar issue that can be fixed by ±Frequency² function of OSD menu or not.
Judge
-
Change Main Board.
C.
Audio Troubleshooting
1.)
No Sound Output.
-
Check if ±Mute² function has been activated or the volumn is set to the minimun.
-
Ensure the signal cable and Source are working fine.
-
Use the new Speaker for the Sound output test.
(Replace the speaker if the new speaker works fine with the unit.)
-
Check the Speaker wire that has broken issue or not.
Judge
-
Change Main Board
2.)
Sound Output With Noise.
-
Ensure the signal cable and source are working fine.
-
Ensure the volume has not been set to the maximum
(Due to the output power of internal speaker is 2W only.)
It might has the noise issue if the volume is set to the maximum.)
-
Use the new speaker for the test.
(Replace the speaker if the new speaker works fine with the unit.)
-
Check if the speaker wire is broken or not.
Judge
-
Change Main Board
D.
Remote Control Troubleshooting
The OSD menu cannot show on the screen when you press the menu button on the remote
controller.
-
Replace the new battery if there is no laser output when you press the laser button on
the remote controller.
-
Replace a new remote controller if there is OSD menu showing on the screen when you
press the menu button on the keypad.
Judge
-
Change Main Board or Keypad Board.