TroubleshootingTroubleshooting

Confirm the following problem and cause.

Should any problem persist, contact an Authorized Service Center.

Problem

Cause

Page

 

 

 

 

zzThe power cord may not be connected securely.

19

 

zzNo electric supply at the wall outlet.

21

 

zzThe circuit breakers have tripped.

Power does not turn on.

zzTEMP or LAMP indicator is lit or flashes.

46

 

zzThe lamp unit cover has not been securely installed.

49

 

zzThe control buttons are LOCKED.

44

 

zzCONTROL PANEL in the PROJECTOR SETUP menu is invalidated.

44

 

zzThe audio signal source may not be connected properly.

17, 18

 

zzThe input selection setting may not be correct.

23

No picture appears.

zzThe BRIGHTNESS adjustment setting may be at the minimum setting.

30

 

zzThe signal input source may not be operating properly.

 

zzThe AV MUTE function may be in use.

24

 

zzThe lens focus may not have been set correctly.

23

The picture is fuzzy.

zzThe projector may not be at the correct distance from the screen.

15

zzThe lens may be dirty.

47

 

 

zzThe projector may be tilted too much.

15

Color is pale or grayish.

zzCOLOR or TINT adjustment may be incorrect.

30

zzThe input source which is connected to the projector may not be adjusted

 

correctly.

 

No sound can be

zzThe audio signal source may not be connected properly.

17, 18

heard from the internal

zzThe volume adjustment may be at the lowest possible setting.

25, 41

speaker.

zzA cable may be connected to the VARIABLE AUDIO OUT terminal.

13

 

zzThe batteries may be weak.

 

zzThe batteries may not have been inserted correctly.

14

The remote control does

zzThe remote control signal receptor on the projector may be obstructed.

14

zzThe remote control unit may be out of the operation range.

14

not operate.

zzREMOTE CONTROLLER in the PROJECTOR SETUP menu is

44

 

 

invalidated.

 

 

zzThe remote control is under a strong light such as fluorescent.

14

The control buttons

zzCONTROL PANEL in the PROJECTOR SETUP menu is invalidated.

44

(If you have a loss of the remote control while the CONTROL PANEL is

 

of the projector

 

invalidated, press and hold the MENU button for 2 seconds by pressing the

 

do not operate.

 

ENTER button.)

 

 

 

 

zzThe signal format (TV-SYSTEM, RGB/YPBPR) may not have been set

31

The picture does not

correctly.

 

display correctly.

zzThere may be a problem with the VCR or other signal source.

 

zzA signal which is not compatible with the projector is being input.

52

 

zzThe RGB signal cable is too long. (Limit to 10 m (32'10").)

Picture from a computer

zzThe external video output from a laptop computer may not be correct.

36

(You may be able to change the external output settings by pressing the

 

does not appear.

[Fn] + [F3] or [Fn] + [F10] keys simultaneously. The actual method varies

 

 

depending on the type of computer; refer to the documentation provided

 

 

with your computer for further details.)

 

The projector cannot be

zzEMULATE in the PROJECTOR SETUP menu is not set correctly. (If you

40

controlled through serial

fail to select your product series, ask your dealer for repair. )

 

terminal.

 

 

 

Note

zzIf the projector does not operate normally after the above remedies are taken, contact an Authorized Service Center.

Maintenance

ENGLISH - 51

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Panasonic PT-LB75VU, PT-LB90NTU, PT-LB90U, PT-LB78VU operating instructions TroubleshootingTroubleshooting