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

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Green light blinking - Panasonic PT-40LC12

The TV stoped funtioning (black screen) - I checked the bulb and found to be all right. I saw few answers for the same question to check the fuse and check the voltage at the ballast. Please help me how to do those checks. Thanks and appreciate your help in advance.

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  • chrisstv Dec 17, 2007

    i have the panasonic pt 45lc12 tv and getting the green light blinking you know how to change the thermal fuse? I haven't done anything to resolve the problem yet.I don't think it could be the lamp as i just changed it about a month ago.I also have never had a green blinking light before.

  • lakeman Jan 22, 2008

    I'm not sure if my problem is related or not. I have the PT-50LC14 set which is about 2-1/2 years old. On start-up the green power light blinks normally about 7 times as if warming up and I can hear the fan running. At that point the set turns itself off and the green power light turns red (no blinking) iindicating the set is off. Repeated attempts yield the same result. We had this same problem when the set was less than a year old but it was so intermittent then that we did not call service. At that time we could try starting it a few times and it would eventually turn on normally. The problem went away until now. Have already tried cleaning the filter.

  • jalli Apr 28, 2008

    I got this resolved as per the recomendation by "ctf1800". Thanks a lot ctf1800. Thanks! Thanks! Thanks!!!!!. and Thanks FixYa

    I appreciate your help. It worked for me.

    Best Solution
    posted on Jan 28, 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
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 shack 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

Posted on Jan 28, 2008

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After 6 days of inability to start my set, it miraculously started up last evening after I pressed and held the power button. Again the power LED flashed green 7 times, then red once then green again while I held the button in but this time the green flashing turned to green solid and the set powered up normally. (I had tried holding this button in several times earlier to no avail.) My problem is apparently not the bulb nor the ballast but rather some intermittency such as a bad solder joint or a connector that is intermittent. Anyone else experienced this sequence of symptoms?

Posted on Jan 28, 2008

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

my e-mail is <>

Posted on May 22, 2008

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