The LST 3800 powers up and on the display it shows backlight. every now and then it will cycle through the optional menus. When I press the menu button or the up and down buttons nothing happens.

Press the helpful button and check link below for various models

First power off your TV using the remote, then press following buttons quickly on your TV remote:
Display (or i+) + 5 + Volume Up + Power
It'll show the hidden service menu on your TV screen.
Once you enter into service menu, you can press Menu (or Options) button again on your remote to switch between various service modes such as Digital, Chassis and VPC.
To navigate between available options press 1 or 4 buttons. To change or modify their values press 3 or 6 buttons.
To save your changes, just press Mute + 0 (or Enter) buttons on the remote.
To restore settings to factory defaults, press 8 + 0 (or Enter) buttons.
PS: For some new models the above mentioned method might not work. You can try following key sequence to access service menu in those new models:
While TV is on, press Left + Right + Mute + Center button + Mute + Menu buttons.

Hidden Secret Service Menu Codes for Sony Samsung LG and Philips TV
TV Service Menus Hidden features you didn know about

In my openion, Its problem of hardware in your TV and signal processing circuits are involved. It might be problem of Firmware (programe to control the performence over all) Philips can advise you better in this regard.

Hi try this links. click here

thanks!

Sanyo TV Service Menu Method 1

1.Unplug the power cable.
2.Press and hold the {MUTE} button on the remote control while plugging the power cable back into the outlet.
3.Keep pressing the {MUTE} button until the TV powers on with the Service Menu displayed.
4.Use the {CH+} {CH-} buttons to select menus.
5.Use the {VOL+} {VOL -} buttons to change settings.
6.Some menus might have sub-addresses. Use the numeric buttons {0} to {7} to adjust sub-item data.
7.Press the {MENU} button or turn the TV off to exit.

Sanyo TV Service Menu Method 2

1.Unplug the power cable.
2.Press and hold the {VOL -} button on the TV while plugging the power cable back into the outlet.
3.Keep pressing the {VOL -} button until the TV powers on with the Service Menu displayed.
4.Use the {CH+} {CH-} buttons to select menus.
5.Use the {VOL+} {VOL -} buttons to change settings.
6.Some menus might have sub-addresses. Use the numeric buttons {0} to {7} to adjust sub-item data.
7.Press the {MENU} button or turn the TV off to exit.

Sanyo Projector Service Menu Method 1
Factory Menu Access

1.Press and hold the {SELECT} and {INPUT} buttons on the Projector at the same time for about 10 seconds.
2.The Factory Menu will be displayed.

Service Menu Access

1.Press and hold the {MENU} and {INPUT} buttons on the Projector at the same time for about 10 seconds.
2.The Service Menu will be displayed.
Use the {UP} {DOWN} {LEFT} {RIGHT} buttons to move through menus and change values.
To exit, turn the Projector Off.

Sanyo Projector Service Menu Method 2

1.Press & hold the {MENU} button on the Projector for about 10 seconds.
2.The Service Menu will be displayed.
3.Use the {UP} {DOWN} {LEFT} {RIGHT} buttons to move through menus and change values.
4.To exit, turn the Projector Off.

Hello

If you are looking for its service menu, there is no code, but some doings is necessary as follows.
Two proceedings are given. One amoung them will surely open your TV to service mode adjustments.

To enter the service menu do the following. Most of the sanyo sets will get positve results with this.

Unplug the power cable.
* Press and hold the {MUTE} button on the remote control while plugging the power cable back into the outlet.
* Keep pressing the {MUTE} button until the TV powers on with the Service Menu displayed.
* Use the {CH+} {CH-} buttons to select menus.
* Use the {VOL+} {VOL -} buttons to change settings.
* Some menus might have sub-addresses. Use the numeric buttons {0} to {7} to adjust sub-item data.
* Press the {MENU} button or turn the TV off to exit.

OR

* Unplug the power cable.
* Press and hold the {VOL -} button on the TV
while plugging the power cable back into the outlet.

* Keep pressing the {VOL -} button until
the TV powers on with the Service Menu displayed.

* Use the {CH+} {CH-} buttons to select menus.
* Use the {VOL+} {VOL -} buttons to change settings.

* Some menus might have sub-addresses. Use the
numeric buttons {0} to {7} to adjust sub-item data.

* Press the {MENU} button or turn the TV off to exit.
OK

Try hard reset, Please unplug the tv cables and power cables for 30 min and redo the cable and check its working ....




Good luck...

To disable the operator panel menus so that changes cannot be made to the printer default settings: 1 Turn the printer off. Note: Disabling the operator panel menus does not prevent access to the Job Menu or to Print and Hold functionality. 2 Press and hold Select and Return and turn the printer on. 3 Release the buttons when you see Performing Self Test. Config Menu appears on the first line of the display. 4 Press Menu until you see Panel Menus, and then press Select. Disable appears on the second line of the display. 5 Press Select. Locking Menus appears briefly. 6 Press Menu until you see Exit Config Menus, and then press Select. The menus are disabled. If you press Menu, the message Menus Disabled appears. To enable the menus: 1 Repeat steps 1 through 4. 2 Press Menu until you see Enable. 3 Continue with steps 5 and 6.

1 Make sure the printer is on.
2 Press Menu until you see Utilities Menu, and then press Select.
3 Press Menu until you see Print Menus, and then press Select to
print the page. The message Printing Menus appears on the
display.
4 Verify that the options you installed are correctly listed under
“Installed Features.”
If an option you installed is not listed, turn the printer off, unplug
the power cord, and reinstall the option. See Step 3: “Install
memory and option cards” on page 30 for more information.
5 Verify the amount of memory installed is correctly listed under
“Printer Information.”
6 Verify that the trays are configured for the sizes and types of
print media you loaded.

or

1 Make sure the printer is on.
2 Press Menu until you see Utilities Menu, and then press Select.
3 Press Menu until you see Print Net Setup, and then press
Select to print the page.
4 Check the first section on the network setup page and confirm
that Status is “Connected.”
If Status is “Not Connected,” your LAN drop may not be active
or your network cable may be malfunctioning. Consult your
network administrator for a solution. Afterward, print another
network setup page to verify connection to your network.

or

1 Launch the CD.
2 Click Quick Reference.
3 Print the documents.
The same Quick Reference pages are stored in the printer. To print
them:
1 Make sure the printer is on.
2 Press Menu until you see Help Menu, and then press Select.
3 When you see Quick Reference, press Select.

To remove the LST-4100A commercial control interface from the television you need to follow the commands below.

1. Power on television.
2. Press and hold "MENU" for 10-15 seconds.
3. Quickly press "2-6-6-3" and then press "ENTER"

If you have done everything properly, it will bring up a small menu in the top left hand corner of the television. Kind of a hidden menu.

4. Arrow down to the menu option that says "D Box" and turn the option to "OFF".

Now turn off television and completely disconnect the LST-4100A. In fact, throw it away. In the trash is where it belongs.

Your television will now operate like a normal television purchased from a big box store. You should run an automatic programming setup for grins upon completing.

Enjoy your new NON-commercial lcd television.

first i assume you are trying to watch the unit through AV. If this is the case, turn on unit, press "Display Format" on the front of the unit, keep press it till you have "YPBPR" displaying, press select on front panel, next press "Display Format" again till you come to 576i, press select. Now press menu and it should display. If this problem occurs with HDMI, simply change the display settings to HDMI, and 1080i. Hope it helps, Murder-face.