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

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PT 40LC12 Panasonic

In response to your question about my set, picture lasts for 30 sec and goes off. The red light blinks 4 times stops and then repeats. Thermistor checks out and the bulb appears to be good for at least 30 sec. All fans are turning. Please be specific. Thanks Ken

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  • Anonymous Oct 05, 2008

    picture lasts for 30 sec and goes off. The red light blinks 4 times stops and then repeats. Does anyone know the service code or how to repair?

  • golfinangelo Oct 09, 2008

    same problem in our television set!!!

  • kv22star Apr 20, 2009

    Same problem with the set turning off and the 4 blinking lights. I replaced the bulb in November of 2008 and we've been gone for three months (TV not used).

  • Anonymous May 12, 2009

    I recently replaced the bulb for the 4th time. Tv turns on for 30 seconds and then turns off. the red lamp indicator flashes red 4 times every 5 seconds. I have been told that most likely the ballast needs to be replaced. I am tired of spending money on an obsolete set. my solution is to buy a new lcd flat panel with a one year warranty for the price of 2 bulbs from panasonic that only come with a 90 day warranty each. I contacted panasonic technical support and they claim they don't even know what 4 flashing red dots means, but they will be happy to sent a technician out. I find this an insult to my intelligence. They manufactured the set, and programmed the lights to activate in sequence depending on the malfunction. Last panasonic item i ever purchase.

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Problem is the bulb.
I had this exact same problem.  Even though the bulb appears to be good, it is drawing too much current to run properly, and the ballast is shutting it down.

Posted on Aug 18, 2008

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My set had the exact same problem. Read mikeygstl and changed the bulb and sure enough the set works perfectly again. Even though the old bulb did come on, it had a 'foggy' appearance in the lens once I took it out - so something was wrong with it.

Posted on Jun 25, 2009

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It is one of three things...the bulb, the ballist, or the fan filter is clogged.

Posted on Apr 14, 2009

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1 Answer

PT-40LC12


Power Supply!!! to all with this kind of problem, if you have a brand name get the supply rebuilt by tri state modules or pts corp. easy to remove and install yourself.

Jul 23, 2009 | Panasonic PT-40LC12 40 in. LCD Television

3 Answers

The Power Light is Red


yeah, should stay red when unit is turned off, indicating there's power but it's doing nothing.

Per user manual:
Solid red - power off (standby mode)
blinking red - power off (now cooling)
blinking green - power on (preparing to light lamp)
solid green - power on

Mar 08, 2009 | Panasonic PT-40LC12 40" Rear Projection...

1 Answer

Lamp indicator flashes red 3 times every 5 secs.


Three blinks - B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This is also a problem in the power supply circuit, check T603 and R672.

Jan 31, 2009 | Panasonic PT-44LCX65 Television

1 Answer

The tv wont turn on


hello 2 blinks on this tv means you have this issue below
PT-44LCX65
2 blinks 5 secs you have your lamp cover open

check for this

hope this helps

Dec 14, 2008 | Panasonic PT-44LCX65 Television

2 Answers

Shut down


Sent me the serial number, and I can check for any re-call ...

my e-mail is <ultraman_s@yahoo.com>

May 15, 2008 | Panasonic PT-40LC12 40" Rear Projection...

3 Answers

Ballast problem on PT-40LC12


Sent me the serial number, and I can check for any re-call ...

my e-mail is <ultraman_s@yahoo.com>

Feb 01, 2008 | Panasonic PT-40LC12 40" Rear Projection...

1 Answer

Hard time turning tv on and once on, will turn off after a period of time


Sounds like it may have been jarred or theres a larger tall capacitor in the power supply that goes bad in these sets alot. Its not something a layman should attemt. As a matter of fact the only thing in this set that is user replaceable, is the lamp. Sorry but your going to need the service manual and soecialized tools tom trouble shoot this set. you really should seek out a pro for this repair.

Sep 12, 2006 | Panasonic PT-40LC12 40 in. LCD Television

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