Question about Panasonic PT-50LC13 50" Rear Projection HDTV

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Pt-50lc13 will go on and work fine for about one minute then go out. power button flashes red. why?

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  • gberlin Sep 24, 2008

    It comes on and works fine for a minute or so. Then turns off, and the red LED flashes continuously. Fan stays on forever. Could it think that it is overheeating?

  • Mike Gla Mar 28, 2009

    I have the same problem with mine. I replaced the lamp only. Still did not work. Then I purchased a ballast repair kit. Then it worked. But only worked for a minute. So, this tells me not only having a compatible lamp that will work, but when lamp goes out, it can short out the ballast from not working.

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I fixed my TV. As I said, the TV would come on and work normally for about 1 minute. Then, it would turn off and the red power LED would blink continuously with the fan running, indefinitely. One more thing I did not mention previously is that the LAMP led on the front panel would blink once every 4 to 5 seconds.

After reading many different blogs, I went for the cheap fix first. I purchased the Ballast repair kit, Panasonic P/N LSUC0022. $21. It required opening up the ballast unit and replacing some components on the PCB. I noticed that some of the values of the components were different than the original ones. Unfortunately, the symptoms after this repair were the same. Oh well - no harm done. Perhaps improved it for the long run.

Next thing to try was the bulb. A costly thing to try, but an extra buld won't go to waste if I get the TV working.

Much to my surprise, this did the trick. Works fine now. The bulb had 1600 hours on it.

By the way, I went the less expensive route for the bulb. I purchased the bulb only - not the bulb with the enclosure. It was very easy to do, and much less expensive. I also purchased a Philips brand bulb, which is supposed to be much better than the original. If you decide to go the "bulb only" route, I highly recommed getting it here http://www.discount-merchant.com/Panasonic-TY-LA1500-Replacement-Lamp-bare-bulb-p/panasonic_ty-la1500_lamp_1.htm&Click=1683. This buld includes the wires and connectors, and requires only a screwdriver. This company also offers a Philips bulb with the entire enclosure. Don't get a bulb only that requires cutting wires and soldering!

I did eventually get a service manual. The troubleshooting chart for the LED blink pattern I had indicated the following:

"Wait until the lamp has cooled off. Confirm that the Thermal Fuse Unit is not open. Still NG, replace the Lamp. Still NG, replace the Ballast C.B.A. Still NG, replace the Main C.B.A."

Thanks to the person who responded! Your kindness inspired me to respond back with my results....

Posted on Oct 11, 2008

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I purchased pt60lc13 manual and all my indicator lights suggest it's ballast cba.( I already replace bulb) I've got ballast board out of tv and don't see anything that looks wrong. Do I need to replace whole board or does repair kit work? Does repair kit tell you what to look for to repair?

Posted on Oct 04, 2009

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I had the same problem. The symptoms described by others were exactly the same. I read the solution posted by josh_z and the results by gberlin.

I bought a new bulb and that fixed the problem. Thanks to both of you for posting a response to this problem.

I side note to this problem was I recently replaced the problem bulb only. It was one of those you buy on ebay were you have to cut the wires of the old bulb. That bulb was on $69, I guess I got my moneys worth. This time I replaced the whole thing with a original equipment bulb and housing $118. I got a one year warranty from the seller on ebay. The whole thing was cheaper that buying just the philips bulb $149. I hope I don't regret not paying the extra money for the 'higher quality bulb'.

Posted on Mar 15, 2009

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Problem: the TV would come on and work normally for 2 - 15 minutes. Then, it would turn off and the red power LED would blink continuously with the fan running, indefinitely. the LAMP led on the front panel would blink once every 5 seconds.

Fixed: replaced lamp. bought lamp from eBay for $90.00.

the HID lamp will tend to increase the lamp voltage at its end-of-life. if the ballast detects the high than normal voltage, it will shutdown. if the ballast voltage detecting circuit desighed marginally, even the lamp is not too old, once the circuit trigs, it shuts down. if some componets in the feed back circuit failed, it will also trig the circuit to cause shut down. that's why some people replaced lamp but still not fixed the problem. but replacing lamp would be the first thing to try, I would say, because it is the easiest thing to do.

Posted on Nov 04, 2008

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Check whether the Temp LED or Lamp LED is flashing. Then check how often.

If it works for about a minute then it means the Thermal sensor (or Thermistor) close to the Projector fan is telling the TV to shut off. There are two possible reasons.

#1 if the TEMP LED flashes once every 5 seconds then the sensor is telling the TV that the sensor is not working. Solution? Replace the sensor.

You will need part # LSEP3099A1, It will run you about $40 with shipping.

Unplug the TV first. Then take off the front panel of the TV as if you want to access the bulb. But instead of opening the bulb compartment open the middle compartment to expose the projector. You will notice a wire plugged into a board. That is the board you need to replace. Unscrew the board and carefully disconnect the wire, replace with new one then plug in and turn on.

#2 if the TEMP LED flashes twice every 5 seconds, then it is too hot and not enough ventilation OR the sensor is broken and telling the TV that it is too hot even though it is not. Solution? Clean the air filters OR replace the sensor by following solution for #1

Unplug the TV. Then take off the front panel and try to access the projector compartment. You will notice that you are looking at some sort of box. Touch the top left corner of this box and you will notice it as foam, you will also find that there is foam underneath. These are the air filters. Try to get the dust off them if they are filled with dust.

Posted on Oct 09, 2008

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