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22 ViewSonic PJ750
Symptom
Before requesting repair, please check in the following chart. If the situation cannot be corrected,
then contact your dealer.
Table 11: Symptom
Symptom Possible cause Remedy Page
The power is not
turned on.
The main power switch is
not turned on.
Turn on the main power switch.
8, 9
The power cord is
disconnected.
Plug the power cord into an AC
power outlet.
No video or audio.
The input is not correctly
set.
Use the projector or remote
control transmitter to set.
10
No signal input. Connect correctly. 7, 8
Video is present but
no audio.
The projector is not
correctly connected.
Connect correctly. 7, 8
The volume is set to
minimum.
Press VOLUME on the remote
control or display the menu
screen and adjust the volume.
11, 15
Mute is turned on. Press the MUTE button. 11
Audio is present but
no video.
The projector is not
correctly connected.
Connect correctly. 7, 8
The brightness adjustment
knob is rotated fully
clockwise.
Select BRIGHT with the MENU
button and the press the button.
12
The lens cap is still
attached.
Remove the lens cap. 9
Colors are pale and
color matching is
poor.
Color density and color
matching are not correctly
adjusted.
Adjust the video. 12
Images are dark.
Brightness and contrast
are not correctly adjusted.
Adjust the video. 12
The lamp is approaching
the end of its service life.
Replace with a new lamp. 17
WHISPER mode is set. Clear WHISPER mode 15
Video is blurred.
Focus or H PHASE is out
of adjustment.
Adjust the focus or H PHASE. 9, 12