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

1 Answer

Reset tv after cleaning

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

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Panasonic Master
  • 1,113 Answers
Re: reset tv after cleaning

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

1 Suggested Answer

  • 143 Answers

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

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Sharp projection tv lamp replacement

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.
  3. Check and clean the air filters on a monthly basis. Having a clean air filters means that your lamp has better airflow. Air is what is used to cool the lamp and the cooler your lamp runs the longer it will last.
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.
  1. Turn your TV off. Let it sit there for about 5 minutes to let the cooling fan help cool the lamp.
  2. Unplug your TV from the power let it sit about another 30 minutes. Even with the TV turned off power is still going to the lamp and the lamp receptacle can still be hot enough to burn you. Even if you think that the lamp is cool I recommend that you do not touch the receptacle.
  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.
  5. Pull the lamp out. Most lamps have a plastic tab or hoop on the handle that you can use to pull it out. Follow the owners manual for specific instructions on how to pull the lamp out. Make sure you do not touch the surrounding lamp housing if you just turned off the TV. It can burn you if it is hot.
  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.

Dec 23, 2007 | Projection Televisions

1 Answer

Red lamp light is blinking. Replaced lamp and light is still blinking.

The lamp still does not light up after the new lamp installed? Or the lamp is working but the Red lamp still blinking? Reset the lamp timer after the lamp is installed?
Description of product:
Replacement RPTV projector lamp HITACHI 50C10

Supplied equipment: gloves, filter
Lamplife (hours): 5000
Performance (W): 100
Lamp type: UHP

Changing the lamp:
1. Turn off the projector and unplug it. Let the projector cool for at least 45 minutes. The hot lamp can burn you!
2. Find the lamp cover on the projector and remove it by loosening the screws on it.
3. Use a proper screwdriver to loosen the screws which secure the lamp inside the projector.
4. Grasp the lamp by its wire handrail or handle plate and carefully remove it.
5. At this point, always clean the projector and replace the air filter which provides air to the lamp.
6. Install the new lamp according to the aforementioned instructions in the reverse order.
7. Turn on the projector and turn the lamp operation counter to zero.

Changing a bare lamp without module:
1. Turn off the projector and unplug it. Let the projector cool for at least 45 minutes. The hot lamp can burn you!
2. Find the lamp cover on the projector and remove it by loosening the screws on it.
3. Use a proper screwdriver to loosen the screws which secure the lamp inside the projector.
4. Grasp the lamp by its wire handrail and carefully remove it.
5. At this point, always clean the projector and replace the air filter which provides air to the lamp.
6. Remove all impurities from the lamp module. If it is damaged, or if the connectors are oxidized, order a new complete module - you will thereby prevent and potential damage to the lamp or to the projector!
7. Examine and remeber in detail the method by which the lamp is fastened in the module, and the method of clamping the connectors - or mark the original connection.
8. If one of the connector parts is firmly fastened to the lamp, it will be necessary to disconnect it. Plug the cable eye to the end of the connector. The cable eye is included with the lamp.
9. Carefully remove the old lamp from the module. Wear a glove when installing the new lamp. The glove is included with the lamp. Never touch the lamp with your bare hand!
10. Insert the new lamp into the module and tighten the connectors.
11. Install the new lamp according to the aforementioned instructions in Numbers 1 to 5 in the reverse order.
12. Turn on the projector and turn the lamp operation counter to zero.

Reset the lamp counter hours of operation for the projector HITACHI 50C10
1. Turn on the projector
2. Press the "RESET" button on the remote controller for at least 3 seconds and the dialogue window will appear
3. Select the "RESET" function
4. The counter is at zero

Product websites:

Dec 03, 2010 | Hitachi 50C10 LCD TV

2 Answers

An OSD advising "AIR FILTER CLEANING" is displayed

You must remove the light engine then locate the filter by removing a black cowel looking device at top of engine held by 4 screws,then you will see the rectagular filter held with 4 screws you must pry out the filter it does not come out easy. Clean it with clear water and blow out with compressed air look at it through light to make sure it is clean. reassemble The sevice manual will show you how to remove the light engine.

Feb 10, 2010 | Panasonic PT-52LCX66 Projection Television

1 Answer

Newlamp went out in 20 days. lamp light blinks. is lamp dead now?

Biggest problem with DLP tv's is they get dirty (the usually have two or more in the back w/filter and one under the lamp). If air-flow is restricted the life of the lamp is in jeopardy. Verify air flow & clean filter(s). Replace lamp with exact P/N..not those that say they "are equivalent"...they are not. Also, be sure the lamp lens is very clean.

Apr 02, 2009 | Mitsubishi WD-62525 62" Rear Projection...

1 Answer

Panasonic dlp new bulb clean filter error message reset info not

For the Air Filter message, the filters are located inside the unit, if already cleaned, perform a reset of the unit, Press Hold, VOL - on set and TV/Video on remote for about 5 sec. If a Lamp timer reset message, try VOL - on the set and Mute, Move or PIP on the remote (try all three)

Mar 29, 2009 | Panasonic PT-50LC13 50" Rear Projection...

2 Answers

Mitsubishi WD-62527 replacement lamp install and brightness low

as i previously posted, my picture was dim, muddy looking after replacing lamp with osram lamp. i fixed mine by taking the screen off and cleaning the small mirror. it had a thick layer of dust on it, cleaned with a microfiber cloth. no water, no glass cleaners. i also used a very fine new small paint brush and dusted the projector lens which also had a dust film. brightness, contrast and clarity returned!

Dec 23, 2008 | Mitsubishi WD-62725 62" Rear Projection...

2 Answers

Reset lamp meter on Panasonic PT-43LC14 television

While TV is on, simultaneously press and hold both the TV's Volume Down button and the remote's PP/Play button for 7 seconds.

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

4 Answers

Air filter cleaning

Air Filter Cleaning for Panasonic PT-43LCX64 PT-50LCX64 PT-60LCX64

OK, I purchased the service manual which explains it pretty good. However it is pretty complex with about 45 screws to be removed so if your going to attempt it buy the manual (mine cost $14.99). There are 3 filters, one at the back and two at the front. Once the procedure is completed there is nothing else to do other than switch it on. There are no timers to reset in the software like some other models. So there must either be an airflow sensor or a temperature sensor. I'll look at the service manual in more depth when I have a chance.

I do have a request for someone. The filter at the rear was pretty clean as was the one on the top part of the projector assembly. The one at the bottom of the assembly was dirty. I think that it might be possible to clean the front filters far more easily. So if anyome wants to try it here is a possible solution.

Remove the front panel (silver). Undo the 2 screws on the cover of the projector housing (not the one that gives you access to the lamp. Remove the cover. Carefully vacuum the top dark grey foam filter on the left side of the pojector unit. Next vacuum the bottom of the unit. That's were the main and dirty filter was. You can't really get to it but I'm hoping you might just get enough off to get it working. The TV senses if its clean enough so there's nothing to loose by seeing if this shortcut works. Once the error comes back I will try it myself.

Good luck

Jan 03, 2008 | Panasonic PT-50LC13 50" Rear Projection...

2 Answers


replace with a new aire filter or clean the air filter

Nov 23, 2007 | Panasonic PT-40LC12 40" Rear Projection...

Not finding what you are looking for?
Panasonic PT-40LC12 40" Rear Projection HDTV Logo

282 people viewed this question

Ask a Question

Usually answered in minutes!

Top Panasonic Projection Televisions Experts

Jaime Hernandez

Level 3 Expert

2267 Answers

Josh Whitehead
Josh Whitehead

Level 3 Expert

1142 Answers

The Knight
The Knight

Level 3 Expert

66413 Answers

Are you a Panasonic Projection Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides