Question about Panasonic PT-LB20U Multimedia Projector

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I can't get any red in my displayed image. I have

I can't get any red in my displayed image. I have tried all possible setting changes within the menu of the machine.

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  • curt_elliott Aug 02, 2010

    How do you change the red lcd lamp? Are there instructions or screenshots available?

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  • 22 Answers

The red lcd has gone bad...change the lcd...and it will work..
Art


Posted on Aug 02, 2010

  • toartkay Aug 02, 2010

    Changing the red lcd is a factory service item...
    Instructions may be available in the factory service manual...
    I don't have the manual...and I don't think the part is offered for sale to the public..

    You may want to look on ebay for the part you need....
    Check out ..3LCD Projector Optical RGB Light Valve L3P07X 0.7"
    ebay item number...200503075242 this will work in your projector.

    This is a drop in module with all 3 lcd's on it...factory aligned...
    all you have to do is remove your old one and drop in the replacement...Light Valve...couple of screws hold in place...
    plug in the connectors for the 3 lcd's and that's it.

    This is a quick and low cost fix...for your problem...
    by passing factory service...can't guarantee it..you may not be
    technically qualified to handle it...or maybe you could get
    a technician to replace it for you...

    That's it..open up you projector..remove the old light valve
    and plug in the replacement...










  • Greg Heath
    Greg Heath Feb 25, 2011

    Pleaae note that you have to disconnect all the cables off the main processor board and undo a heap of screws. Just be careful to note where everything came from.

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If you're trying to project video, then the unit needs professional service. If you're trying to project from a computer, you may have a loose display cable, broken pins in one or both ends of the display cable, or broken conductors (wires) within the display cable. The computer sends its image information as a template of RED image components, GREEN image components and BLUE image components with the projector overlays to create the complete image with blended color values. (The computer also sends HORIZONTAL and VERTICAL synchronization signals, but those don'e affect the color content of the projected image.) That's why I'm suspicious of the display cable, conductors or pins.

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Hi,

Many factors can affect the image quality of your pictures. If you are experiencing blurry images, please try adjusting the focus ring located around the lens.

This will allow you to focus the camera image on objects at different distances.

Also, make sure there is good lighting. Improving the lighting conditions can improve the image quality considerably.

Connection Issues:

If the image quality is poor while transmitting video over the Internet using video enabled programs such as MSN Messenger, Yahoo! or AOL Instant Messenger, your connection speed to the Internet directly affects the image quality of the transmitted video.

Corporate LAN, DSL/cable modem connections will result in the best image quality experience, while dial-up connections may result in choppy and overall poor quality because of the slower connection speed.

Even broadband connections such as DSL/cable modem may experience choppy video at times because of Internet traffic or slow upload speeds.

If the image appears clearly in the camera software, most likely your Internet connection may be responsible for the poor image quality in your video program.

Changing Display Adapter Settings:

If you are still experiencing a distorted, fuzzy or grainy image, you may need to change the settings for your display adapter.

For optimal image quality, please make sure the video display adapter is set to display at least 16-bit high color or higher.

To change the color palette please perform the following steps:

Click on "Start," "Settings," and "Control Panel."

Double-click on the Display icon.

Click on the tab labeled Settings.

In the dialog box labeled Color Palette, verify the video mode is set to 16-bit (high color) or 24-bit (true color).

Also, check with the manufacturer of the video card for updated video drivers.

Low Light Boost:

If you cannot do anything to improve the lighting situation, some Logitech video cameras have an option for "Low Light Boost."

If there is an option for "Low Light Boost," try enabling the "Low Light Boost" in the QuickCam software.

To do this:

Open the QuickCam software.

At the bottom right hand corner of the camera image box, click on the arrow next to the QuickCam icon.

Choose "Advanced Camera Settings".

Under the Image Enhancement box, place a check mark in the "Low Light Boost" option.

If that does not improve the image quality, try adjusting the other image settings, such as contrast, saturation brightness, gain and white balance.

Click OK when your are done.

Last, make sure that you ae using the latest drivers.

You can upodate them from here.

http://www.logitech.com/index.cfm/492/&cl=us,en?prodcrid=492

Hope this helps.

Good Luck.

Live, Love, Laugh.

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For Microsoft Windows 2000 / XP OS:
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  2. Click on the [Properties] button. The Properties window will be displayed.
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For Microsoft Windows 98 / ME OS:
  1. Within an application, click on [File] on the toolbar, and then select [Print] from the menu. The Print window will be displayed.
  2. Click on the [Properties] button. The Properties window will be displayed.
  3. Click on the [TekColor] tab.
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    NOTE: It may be necessary to try all the color corrections to obtain the required results.

  5. Click on [Apply].
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From the Apple Macintosh OS 9:
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  2. From the General pull-down menu, select [TekColor].
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  4. Click on [Print] to send the print job to the printer.
From the Apple Macintosh OS X (10.2.x and 10.3.x):
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  2. From the Copies and Pagespull-down menu, select [Image Quality].

    NOTE: If the Image Quality option is not displayed on Copies and Pages pull-down menu for OS X, configure the printer with the correct PPD. See the procedure below, if needed.

  3. Select a TekColor correction.

    NOTE: It may be necessary to try all the color corrections to obtain the required results.

  4. Click on [Print] to send the print job to the printer.
To configure the Printer with the correct PPD:
The PPD file contains features a particular printer supports such as TekColor Corrections. In order for the TekColor Corrections and other printer specific features to be available, the correct PPD file must be specified when the printer is installed, or modify the setting following the procedure below.
  1. Open the appropriate utility: Print Center (for OS 10.2.2.x) or the Printer Setup Utility (for OS 10.3.x):
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    2. Double-click on the [Applications] folder.
    3. Double-click on the [Utilities] folder.
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  7. Close any open windows.
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