Question about Samsung Televison & Video
It could be a very common problem with LCD TVs. The image is showing as doubled say a text showing twice, one few mm below other. I believe this is not the problem with the LCD panel. If firmware upgrade would help or this is a hardware issue. Kindly help
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Posted on Jan 02, 2017
SOURCE: double imaging
The Toshiba 55H70 is a standard rear projection set. It does not have a "lamp", it has 3 picture tubes. When the colors suddenly do not line up on the screen, it means that one of your convergence output IC's has burned out and needs to be replaced. This is very common on those sets. If your set is using the STK392-110 IC's, it is probably a good idea to go ahead and replace both IC's with the newer upgraded STK392-150 IC's. The IC's should be replaced and the convergence circuits realigned by a qualified tech familiar with Toshiba projection sets.
Posted on Sep 11, 2007
It could be a loose LCD connection carefully take off the back and lift the LCD very carfully you will see the ribbon cable lift the tab take out the LCD and reinsert it and push the tab back down. If this does not fix it you might have a damaged main board its one or the other.
Posted on Apr 17, 2008
SOURCE: double image shows in red
it is quite fixable and usually in your home; it is called convergence--kp57wv500 uses two STK 392-560 convergence Ic chips; both and any bad fuses or resistors around them need to be replaced and the set adjusted after.
I fix a lot of these sets in my area---if you call a shop you will pay 300-400----a lot of independent people will do it for under 250 in your home--shop around--now is the slow time of the year for tv shops---you could buy both IC chips on ebay for less then 13 dollars plus shipping---this is a normal problem in all projection tv sets--the chips have a white grease on the back of them designed to transfer heat--after several years it drys out and one of them goes bad---repair should take about an hour or so in your home---you should ask yourself if 200-300 dollar repair is worth while, could you replace the set for this? If the chips are replaced and the set adjusted they should be good for 4 or 5 years at the least.
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Posted on Aug 19, 2009
Testimonial: "Thanks for the detailed advice. Will look into it repair, but plasmas look so nice these days!"
Your symptom sounds like a damaged convergence IC.
While it is not a very hard repair, this repair can be a bit tricky. If you have a 45W soldering iron, solder, solder wick, and heat sink compound you can repair it yourself.
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.
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, 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.
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 14, 2009
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