Question about Panasonic PT-40LC12 40" Rear Projection HDTV

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Reset tv after cleaning

New lamp air filter cleaned now how do i reset it?

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Remove silver panel on front marked HDTV and BBE

Open bulb compartment

On the right side of the bulb compartment is the filter compartment

Remove filter and clean

Every 400hours it will prompt to do so.

Comment by Soulvisitor, posted on Jan 03, 2008 Service mode info

Enter Service Mode: With the TV powered off (make sure it's off for a few minutes before trying this, or you'll wait for the customary cooldown period before anything happens if you turn the set off and try this stuff immediately), press and hold both the "VOLUME Down" button on the TV itself and the TV/VIDEO key on the remote control simultaneously for about 7 seconds (they say over 5 seconds in the manual). The TV will be turned on and it will have a screen full of status data atop an active TV channel.

Next, press the SWAP/STOP key on the remote for more than 5 seconds.

You should be taken to a screen that has " LAMP/FILTER/IIC" as a selectable entity. Press the Action key to select it and move to the next screen of info.

You'll see a status screen with the number of Service Mode Resets of the Lamp run time (I inadvertently reset my Lamp to 0 hrs after 95 hours of initial operation, and I'll show you how to avoid that in a minute). You'll also see Total Time, which I assume is total TV run time, Lamp Run Time, and Filter Time, all in hours.

You can backchain to the the prior screens with the Recall button on remote.

To exit this service mode entirely, you must turn off the TV.

You can also enter a different service mode menu to control a number of parameters, as I first learned from Doug McDonald at this link >> when I was trying to learn how to perform service mode color adjustments.

Depress the "Volume Down" button on the set itself while concurrently depressing the "Recall" key on the remote for about seven seconds, and you'll be taken into "Work Mode". At this point, you can press the Action key, and select "Information", where you'll not only see Input mode (as usual) but also Lamp Run Time (but not Filter time or total run time).

You can enter the more advanced service mode menu by pressing and holding the Volume Down button down on the set itself while concurrently depressing the SWAP/STOP key on the remote for more than five seconds. -- This displayed a Factory Adjust menu, with bunch of settings. See Doug's message for more details. (Do not press Vol Down on the set and PIP/PLAY on remote simultaneously, or you'll reset the Lamp time to 0hrs as I did !)

Unfortunately, the service manual does not describe all the tweakable settings in the Factory Adjust menu.......

Nick Stam
PC Mag and ExtremeTech

Posted on Jan 03, 2008


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Posted on Jan 02, 2017

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SOURCE: tv is displaying to clean

Found on the net:

The Panasonic air filter is located BEHIND the removable Front pops off and you should see it located in a "screwed in" panel.

But, it MAY be located on the BACK or side.....LOOK for a Grille with a grey or black foam piece. IF you don't find it behind or beside the TV, then pull off the Front panel.

Now, those foam filters can be removed from the grille-plate to be washed......the best way to wash it is to PUSH the dust out of the filter by turning the Clean-side of the filter TOWARDs your water source (the faucet or the Much-preferred Kitchen Sprayer)....Now get that DUST OUT!
Once finished cleaning just shake all the water out of the foam panel. Snap it just like you're snapping somebody with a towel. Still Moist? Don't worry, the plenum on the TV is pretty long and "moisturized air" won't hurt the bulb......

Reassemble it......

And DO NOT let that filter go that long between Cleanings!! It EXTENDS the life of the bulb when maintained regularly.

Posted on Oct 12, 2010

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Rear Projection Televisions are not like other televisions that can run maintenance-free for 20 years or more. They need to have their lamps changed on occasion, and most have air filters that need to be cleaned every month or two. Lamps typically last about 8,000 hours on most models high end models, some of the cheaper models last only 1,000-2,000 hours. Keep in mind however that some lamps won't make it all the way to their estimated life spans. If you operate your LCD or DLP TV in a warm environment that is not adequately ventilated, or at higher elevations, this can reduce lamp life. Failing to keep the air filter clean may reduce lamp life as well. And some lamps will just fail sooner than others--estimating average lamp life is not an exact science and testing methods vary greatly among manufacturers.
ere is a checklist of what to do to get the most out of your lamp:
  1. Check out the presets and select the setting with the lowest light output.
  2. Once you've done that adjust the brightness down to your liking. The lower the brightness the long the lamp will last.
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Each owner's manual for a rear projection TV comes with instructions on how to replace the lamp. Here are the typical steps for replacing a lamp.
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  3. Usually the lamp has a cover that you will need to unscrew. Most manufactures use a Philips head screw for holding the cover shut. Unscrew the lamp cover.
  4. Unpackage the replacement lamp. Be careful not to tough the glass, as oil from your fingers can damage the lamp's surface.
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  6. After the lamp has cooled, place it into the empty box of the replacement lamp. Never put the used lamp into a plastic bag.
  7. Using the guiding post also called "gutters" by some manufactures slide the lamp replacement lamp in pushing it until you hear a firm click.
  8. Screw the lamp cover back in.

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Red warning light

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  • Secure the lamp cover and the air filter cover of the projector body if the projector does not power on. Ensure that the power cable is firmly connected to the projector and an active power plug. If the projector was turned off and then on quickly--let it sit for 90 seconds before trying to turn it on.

  • 2
    Replace the projection lamp if the projector will not power on or if the lamp indicator is flashing. Turn off the projector and let it sit for at least 30 minutes. Locate the lamp cover and remove or loosen the lamp cover with a screwdriver. Carefully remove the projection lamp from the projector housing using the handle, if available.

  • 3
    Place the new projection lamp into the projector housing and secure it to the projector. Replace the lamp cover and reset the lamp timer. Power on the projector to ensure the new lamp is working correctly.

  • 4
    Remove the projector from the enclosed area to allow air circulation if it constantly overheats. Place the projector into an open area and make sure there is no blockage for the ventilation holes. Unplug the projector for at least 45 minutes to allow it to soft reset.

  • 5
    Clean the air filter to allow the projector better air circulation. Turn off the projector and unplug it from the outlet. Remove the air filter cover and use a vacuum to remove dust from the area. If the filter is unable to be cleaned correctly or is damaged, then replace it. Pull the air filter from the projector and place the new one in the now empty slot. Close and secure the air filter cover.

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Jun 03, 2008 | Panasonic PT-40LC12 40" Rear Projection...

1 Answer

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Hi Here is the info for you :: Caring For The Air Filter The air filter should be cleaned about every 100 hours. If the indicators or a message prompts you to clean the air filter, clean the air filter as soon as possible. If the soiling will not come off the air filter, or it becomes damaged, then it needs to be replaced. Please replace the air filter as soon as possible. memoWhen you replace the lamp, please replace also the air filter. Turn off the projector, and unplug the power cord. Allow the lamp bulb to cool for at least 45 minutes. Apply a vacuum cleaner to the top of the filter cover and the air filter to clean. If the soiling will not come off the air filter, or it becomes damaged, it needs to be replaced. If the air filter needs to be replaced, contact your dealer to prepare a new air filter. Tell the dealer your air filter type. Turn on the projector power, and reset the filter timer. (1) While the projector running, press the MENU button to open the menu. (2) Choose the ?OPTION? on the menu using the / button, then press the button or ENTER button. (3) Choose the ?FILTER TIME? using the / button, then press and hold theRESET button for 3 seconds. (4) Choose the ?RESET? using the button. memo Incorrectly resetting of the filter timer (resetting without replacement, or neglect of resetting after replacement) will result in incorrect message functions. Here is the link to the users manual :: Further Questions ?? Email Me Have a great evening.

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