Question about Televison & Video
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Posted on Jan 02, 2017
I believe they are the voltage supplies for the TWO convergence IC's that this set uses(either STK-392-110 OR STK 392-150---THEY are interchangeable--but the 150 is a better device)
The easiest way to prove if this is your problem is to locate the two chips (black--2 1/2 inch wide X 1 1/2 inch tall with the STK number printed on them IN WHITE)
If someone unsolders all 18 pins on each chip--see if the set will turn on with them out of the circuit (you do not have to remove them--just unsolder both---If the set comes on the convergence will be very bad but you will know one of the chips is bad.
Also if you look at all the resistors around them (most will have location number RK46 etc) see if any of them are discolored or burnt. You find a burnt resistor and it is a sure bet onE of the chips is bad.
BOTH CHIPS NEED TO BE REPLACED!
A pretty easy repair if you have good soldering skills and I can tell you what you will need to do the repair.
If replacement of the chips fixes the set it just needs to be adjusted with the Hitachi remote and should not have this problem again for 5-8 years.
IF YOU HAVE QUESTIONS, do not hesitate to ask me---I am here to help people.
Posted on Oct 09, 2009
Testimonial: "Thanks for your help, I'll have to pull the board and take it into the shop tonight to try it."
If your Panasonic Television is blinking 3 times then you have a short on your power supply and the most likely suspect is your convergence IC’s.
I have repaired hundreds of these sets, so if you have any questions after reading the following, please reply to this post and I will help you in any way that I can.
With that aside I have some support suggestions that I have put together that may help you make an informed decision.
You should be able to get a local service center to repair this at your house for between $350.00 - $450.00, If you want to repair this set yourself, I have some instructions below that will be a help to you.
While it is not a very hard repair, this repair can be a bit tricky
How do I tell if the IC’s are damaged?
When looking at the area around the convergence IC’s you see some resistors that have changed colors, or you test a resistor and it no longer reads the marked value. You will have to replace the IC’s and the supporting components.
When you remove the old IC's, please be sure to remove all of the old heat sink compound, as it can act as an insulation for the new IC's and cause them to overheat. I usually clean the heat sinks with alcohol and a small rag.
Where are the IC’s located and how do I find them?
There are two and large IC’s that control the convergence in a big screen set. Some of the newer sets only have one. If you only have one, it is right in the middle of the set on the center circuit board. 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.
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.
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/ , they do carry OEM or better parts, and your will get a repair kit instead of just the IC's.
I hope this information allows you to resolve this issue.
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Posted on Jan 31, 2010
To remove the protection screen and lens from my Hitachi model 53SDX89BA:
1) Remove the speaker cover from the bottom. It is attached by velcro.
2) Remove the 4 screws on 4 plastic tabs on the bottom of the screen frame.
3) Remove the 4 screws on the 4 metal tabs on the bottom beneath the screen frame.
4) Pry the bottom corners loose with a wide blade screw driver and work both sides of the screen frame away from the case from the bottom up. CAUTION: The top does not snap away as the sides do. When the sides are loose let the screen frame hang down vertical and lift the screen frame straight up.
5) The protection screen and the lens will come off together.
When reinstalling the screen frame perform the steps in reverse. Be careful when resnapping the frame back onto the case - there are two small wooden support blocks on the bottom. Don't try to force the frame back on until you are sure the bottom of the frame clears these block. You may find it easier just to remove them temporarily until the frame is reattached.
Posted on Jun 09, 2010
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