Question about Panasonic PT-47WX53 47" Rear Projection HDTV
This morning I turned on my tv and after about 2 minutes it shut itself off. The power led on the front is blinking 3 times. I have tried other power outlets, and I have left it unplugged for 3 hours then plugged it back in. Each time, it attempts to come on but returns to the 3 blink with no picture and sound.
Panasonic PT53WX42F with same problem. 3 blinks after power on for a few seconds, no picture or sound. Solution: replaced two convergence ICs (STK392-XXX) located on the large green printed circuit board. ICs are very large and screwed into two large heat sinks and soldered to board. Cost is approximately $6 each. Easy to replace if careful. May be able to access solder joints on bottom of board by removing screen on bottom of cabinet or simply remove 4 screws that anchor plastic holder to cabinet and tilt up. I did not disconnect any inter-board connections. Remove heat sink screws. Desolder using suction bulb or solder sucker. Works great. Finish off with solderwick braid if necessary to clear holes. 40 watt iron is enough do not apply too much heat to damage board lands. Remove IC. Clean heat sink by scraping away white heat sync compound. Apply generous amount of heat sync compound to new IC and coat evenly. Align and insert new IC holes, resolder with thin resin core solder being careful not bridge lands. Refasten to heat sink. Clean board and inspect for good joints and no bridging. Refasten plastic board holder. Carefully clean projection lenses while back is off tv. Power up and it should be fixed. Parts are obtainable on-line. Solder tools and board cleaner are available at Radio Shack or on-line also. I spent $20 on parts and supplies. This is not hard just a bit tedious. You can do it.
Posted on Jan 04, 2008
I also followed Tim Smith's instructions and my TV is now working. The only thing is that as an engineer I realized that the Panasonic TV has a poor way to dissipate the heat which is probably what caused the problem to begin with so I went to Fry's electronics and bought 3 computer cooling fans and adapted them on the back of the TV grid. They are very quiet and they have their own power supply so they do not interfere with the TV operation. In addition next to the same parts that Smith mentioned above I found some resistor that changed from light blue to brownish color this is a sign of overheating. I ordered the resitor directly from Panasonic and replaced them also. So look for some bad resistors.
By the way the service manual cost me $10 and I highly recommend you to get it if you are going to fix it yourself.
Thanks Smith !
Posted on Jun 01, 2008
Check power supply around the small transformers and resolder. Also look for loose connections in powersupply and Check any caps and see if you can see anything out of ordinary.
Posted on Aug 15, 2007
Follow Tim Smith's instructions.... I had the same problem and now I have a working TV. The parts with shipping were about $30 and the repair took me about 1.5 hours. Thanks again!
Posted on Mar 29, 2008
I had same / similar problem with PT47WX42F where if you turn on the tv it would start to give the picture then turn off and the light would blink 3 times. I replaced both convergence IC's and it works again - I paid $20 each at a local electronics store, but you can get them for less than $10 on the net. I replaced the IC's separately, the IC at the back was actually the bad one - root cause they did not use heat sink compound - so spend a little extra and get good heat sink compound when you replace
Posted on Jan 10, 2010
Again, Tim is the Man! His instructions worked. I now have picture, however I have a color convergence problem. I read another article about the service menu. I will try this. BTW. I have never soldered a circuit board in my life. I got the TV free on Craig's list. So, for about $20 and a couple of hours of fun tinkering... I have a working HDTV!!!!!
Thanks Tim and FixYa!!
Posted on Mar 20, 2009
What about the 2 blink code, what is that?
Posted on Nov 07, 2009
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