Question about Panasonic PT-47WX42 47" Rear Projection Television
Your symptom sounds like a damaged convergence IC.
This is a common failure for this particular television. The blinking lights indicate a short in the power supply
There are two and large IC’s that control the convergence in a big screen set. Some of the newer sets only have one. They are secured to a very large aluminum heat sink. They will have a part number stamped on them that will start with an STKXXX-XXX, like STK392-110, and they are located on the signal board (on the left as you look into the back of the set).
Along with the convergence IC’s there will also be some associated components that will need to be replaced as well. There are some resistors that are part of the convergence circuit that will be open and need to be replaced. Most likely these will appear charred in the center. If you have an Ohm Meter or a DVM, check all the resistors that are close to the IC’s and you should be looking for either ones that have opened or have changed values.
There are also two resistors on the front of the board located in the middle that are fusible link resistors, these should be checked for opens and replaced if they are found so.
I would suggest that you contact a service center in your area for a complete diagnosis and repair, as this type of repair can get a little tricky. But if you want to repair the set yourself, just remember to be careful. The capacitors and CRT’s can hold a charge and may shock you.
If one of the convergence IC’s are found to be bad, I would replace them both, if one has gone bad the other may go soon. I usually order my parts from Andrews Electronics in California, they will have the OEM components that you will need.
Their site is http://www.andrewselectronics.com/welcome.aspx
And their phone number is a 24-Hour Order Desk: (800) 274-4666
I recommend the phone order so you can talk to the person about the different types of IC’s that are available.
I would also advise that the convergence IC’s be OEM or better, just because they are cheap does not mean that they are a good deal. I have seen the cheap IC’s fail after a short time, even though they look exactly like the OEM IC’s. I think that the bottom line is that you will get what you pay for when it comes to the parts.
You can also try http://www.tvrepairkits.com/ , I have not tried them yet, but they do carry OEM or better parts.
I hope this information allows you to resolve this issue.
If you need further assistance please comment to this post and I will try to help you further.
Posted on Oct 02, 2009
Three blinks is short protection---usually in this set it means one of the two STK-392-110 convergence chips is shorted.
If you unplug the set and look inside--you will find 2 metal heat sinks that have the chips attached to them; the chips are black and 2 1/2 inches wide X 1 1/2 inches tall and have the full STK number printed on them in white-----
Look at all the blue resistors around in front of them--most are marked 2.2 ohm----if any are discolored or white in the middle you have found your problem.
Both chips and any bad resistors need to be replaced and the set adjusted---you can buy both chips on Ebay for about 12 dollars plus shipping--If you find the bad resistors= 99% chance that one or both chips are bad.
I can provide you with detailed instructions for this repair if you are able to do it---most TV shops will charge 300-400 for this type of repair. I have done hundreds of these sets and charge 200-250 for this repair.
If you get someone to do it--shop around--if they say it has to "go to the shop" keep looking as any good tech can do this repair in your home in about 1 hour.
Also make sure whoever does it changes BOTH of the chips!
I do not know if you have the ability to do this repair--it is a fairly easy set to fix for this problem--what I do when I see this is gain access to the two chips and unsolder both of them--if the set turns on then--one of them is bad.
I am not permitted here to ASK for your email address or give mine......I am here to help people and contact me here if you need help or advice...
Regards, SD TECH
Posted on Oct 02, 2009
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Posted on Jan 02, 2017
My Panasonic PT has developed the same problem: The repair folk came and replaced the "entire" electronics section! The guy said it was $1500 just for the section. He had no idea what caused the problem---just that Panasonic told him to replace the entire unit. I'm delighted it was still under warranty!
Posted on Sep 11, 2005
SOURCE: Power problem
Three blinks - B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This is also a problem in the power supply circuit, check T603 and R672.
Posted on Jan 31, 2009
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