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

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Green Light blinks, no picture, bulb new

The bulb has been changed, but the screen remains black with the green light blinking. How to you go about locating, checking and changing the thermal fuse?

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  • DrBob1 Jan 17, 2008

    Essentially I am having the same symptoms. Power the set up, power light blinks green, I can hear the fan and can feel the cool air coming out of the vent, however the light never goes to solid green and the tv never comes on. Power the set off and normally the fan stays on long enough to cool the lamp down, however seeing as the lamp never goes "hot" the fan shuts off almost immediately.

  • Anonymous Mar 08, 2008

    green light blinks, but no picture, then yellow light blink,

  • Kris K Mar 09, 2008

    replaced lamp 2 mo ago, for the third time. then all the sudden I walk back in the room and the green light is flashing and the screen is black. powered down, waited 10 min, powered up flashing green no video? 

  • Edelaf Mar 16, 2009

    Hey there - I now have the same problem. The "change lamp" message has been coming on for several months, so I ordered a replacement bulb and figured I'd wait until the lamp actually burned out. Well it must have last night. When I turned the unit back on I got the blinking green LED and no picture. I replaced the lamp - found that the original's glass housing was cracked. But once assembled still have blinking green situation. Reading the posts here has been very helpful - I've now ordered the manual so that I can find the thermistor. Thanks to everyone that has posted information on this issue. Edelaf



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I know this isn't the right field to enter this information, however I cant recall where that is. So I will state that as it turned out the lamp was the culprit. After buying the manual from, [bad photos within the manual from Panasonic] and having a friend or a friend look over the particular pages referring to the thermistor AND looking at the lamp, we couldn't determine whether or not the bulb had blown or "fizzled out". As it ended up, thru Panasonic, I found a service technician that would come out to my home, and he was able to determine that it was indeed the lamp. Cost me $300 for the replacement lamp, and additional monies for labor. Not to mention my out of pocket for the service manual and the first tech coming out and looking it over.

Posted on Jan 31, 2008

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Found that the thermistor/temp measuring device is suspect, no resistance across legs. There is a label there that says F701 see service manual
I went here for a tech manual for the Panasonic tvGreen Light blinks, no picture, bulb new - 1.gif.
then ordered
Manufacturer: Panasonic
Part Description: FUSE
Part Number: LSJA0411-1
it was mounted to the case that holds the lamp. had to remove the back panel, etc. Also think I had to splice in the fuse or something. was a while ago.

i purchased a NTE8115 from my electronics supplier, closest I could find. Radio shack1.gif also has them.

remove the back cover and measure for continuity across the thermal fuse
above the lamp housing.
if open jump it wth a 5 amp fuse, be sure to close the safety switch with
the small blue lever then try to power on.
If comes on ok you will need to replace the entire ballast assembly to get
that fuse.
Panasonic does not have a part number for just the fuse on the PT40LC
It is possible to cut off the fuse and replace with another but dont solder
must be crimped.

Posted on Jan 28, 2008


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