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

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Television shuts down as if thermal problem, but cool

Television powers up, lamp lights, picture and sound. After 30 seconds (give or take), set shuts down. Both the exhaust and intake fans shut down; however, an internal fan blowing on a PCB beneath the lamp area continues to run. The lamp indicator light flashes 4 times every five seconds after this occurs. Unplugging the unit and plugging it back in twelve hours later results in the same problem. In fact, the internal fan I mentioned above comes on as soon as the unit is plugged in. Thank you for any help that you can provide. I was recently laid off and am on a bit of a shoe-string budget.

Posted by Michael Gerst on

  • Chris Lieber Feb 13, 2008

    I am having the same issue. Picture is fine when it is up but shuts off and lamp indicator flashes. Did this fix work?

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Shorted red driver trans shorted red pic tube defective focus/screen block any or all of these stk's on convergence module check the solder joints on convergence module

Posted on Jan 31, 2006

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My WD65736 blub shut down with the lamp fail light lit I replaced the bulb now it comes on have a picture for a few about 30 seconds and then shuts down with the lamp fail light on
Most likely is either ballast has failed etc---if you have not do try the sets self check which will indicate a error code.

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Samsung HLS5087WX/XAA DPL shuts down after 30 - 60 seconds, 3 blinking lights
I beleive from what you have told me that most likely it is just a lamp issue, there are a lot of so called original equipment lamps and counterfit lamps on the market that will barely give you 1000 hours run time. When it comes to Television lamps cheeper is not better. Make certain to buy an original Samsung lamp, you should get about 3500 to 4000 hours from it. If you need further assistance or have questions please reply to continue.

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No picture no sound just replaced the bulb -worked great for 2 weeks then quit - tried resetting the lamp timer but tv wouldnt let me - shuts on and off quickly - but gives good picture and sound for a...
Check Lamp Fan if it is defective set will shut down to protect the Lamp.

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Temp light flashes tried unplugging it for a few minutes turned it on tries to power up but then power , lamp , temp lights flash for a few seconds then it shuts down and temp light stays on
It sounds like you have a thermal issue. The TV is getting too hot or the Thermal Fuse is bad. The thermal fuse detects the temperature in the TV and tells the TV to shut down if it thinks it is too hot. Most likely caused by poor ventilation or clogged fans from household dust. Try moving TV away from wall or cabinet first, if this does not fix the problem, clean ALL the fans in the TV. If problem still persists, replace the thermal fuse.

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2 Answers

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CK FAN on LAMP,or you could have problem with Ballast.

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1 Answer

I have no picture and no sound and the tv shuts itself down after about 15 seconds but the lamp light stays lit solid red.
you need a new lamp part# UX21511 this will cause set to shut down

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2 Answers

SOUND AND PIC GOES OUT FOR 30 SECONDS, THEN PIC COMES BACK THEN SOUND. IS THIS THE LAMP OR THERMAL FUSE OR WHAT.
The lamp is going bad. If it was the thermal fuse it would not be intermittent. It is very common for some Sony sets like yours to do exactly what you describe when the lamp is going bad.

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1 Answer

I replaced the burnt out lamp,not working !!!
This may sound crazy. If you still have the old lamp. Put new lamp in old housing, and try that.

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1 Answer

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Replace the lamp, also the shut down time is correct the unit must allow plenty of time proper lamp cooling. otherwise the lamp life will be greatly shortend. normal lamp life is 3000 hrs.
lamp replacement may require an internal limp timer reset have a qualified tech replace the lamp.

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PT-40LC12 40" Rear Projection HDTV

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My WD65736 blub shut down with the lamp fail light lit I replaced the bulb now it comes on have a picture for a few about 30 seconds and then shuts down with the lamp fail light on

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