Question about Toshiba 50HX81 50" Rear Projection Television

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Convergance/coaxial cables I just replaced the two IC convergance chips. In doing so I had to cut two coaxial cables. I believe that I repaired them properly, by soldering together the inside, insulating it with electical tape, than trying y best to surround it in the copper housing, and taping that. when all was said and done, I turn on the TV and get a blinking red light, and a blank screen. Is it the coaxial cables I didn't fix properly? Did I not install the IC convergance chips correctly? The TV has been off and unpluggged for about 8 months, Could this have anything to do with it... any ideas?

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  • Vinceman Mar 15, 2008

    I used the same exact Chips as the ones that were in already... they were about $10 each. Where exactly are F851 and F852? Thanks for your help, I check the IC chips connection as well.

  • Vinceman Mar 15, 2008

    The chips were the same type that the TV came with. They were mid-range in price ~$10 each. Thanks for the help, I'll check the resoldered joints. What do F851 and F852 look like?

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Check any / all soldered in micro fuses...F851,F852,etc.
Note:read my Powered Products>View all>Toshiba>convergence issues .........? What quality IC's did you use and what price did
you pay ?............................T.

Posted on Mar 15, 2008

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Your convergence has failed and needs to be repaired. Once quick test is to goto your convergence menu and see if you can adjust red and blue. If not its has failed and needs to be fixed. You can call in a repair shop or you can get the parts and instructions from www.TvRepairKits.com and do the repair yourself. Its a fairly easy DIY fix.

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U have tools like philip screw drivers,long noise plier and a soldering iron,soldering wick or desoldering pump and solders?U Know how to do basic soldering?Tries websites like Tvrepairworld.com,Tvrepairkits.com to buy a convergence kit to repair it ur self.U can go to You Tube type in convergence problems,will see a video by someone tutoring doing convergence board repair.

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My 9 years old Mitsubishi WS-55857 had the same problem (distorted pictures) for couple of months and I was about to buy a new plasma TV. But, I found TvRepairKits.com and I decided to give a try before buying a new TV. I received a convergence repair kit in two days with web site info for detailed instructions with many picutres to explain the process. When I had questions and Ed was very prompt to answer my questions thru the e-mail. I never done solding before, but I am moderate handy person. I spent less than $100 and three hours and my TV picutre looks stunning. I went thru advanced convergence process after I repalced the convergence chips and replaced RCA video cable with better quality and my TV picture looks as good as brand new. Thansk ED for your help! From Portland Oregon

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Tv has double pictue and yellow and green color


Double picture is due to convergence out chips failure in tv, replace convergence out chips (quantity 02) to fix the problem.
Let me know if you want to replace these chips by yourself, please note that it requires soldering work in circuit board of tv with proper tools.
Thanks.

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How do i get the convergance to work??? The up an down side to side buttons don't work


If you try to adjust convergence with the flash focus, perfect focus, (depending on the make of your set) or by manual convergence and the lines will not line up or even move. What you might be experiencing based on this symptom sounds like a convergence IC problem. But if the set fixes itself you will need to have it repaired as soon as possible if you wait too long there are several components that will fail in due time. If you want to repair it yourself or know someone that can solder components on the circuit board, you will need to re-solder the convergence IC’s. All you will need is some solder wick, a good 45W soldering iron, Acid free solder and some solder wick (this is for the clean-up of solder joints and cleaning up solder bridges.
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 any Projection Television that has a damaged or interment convergence problem, you do not want to continue the use of the set. If the IC’s continue to fail they will cause a short in the power supply and cause your television to not power up, and possibly damage the CRT’s in the set.

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/ , 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.

Thanks for using FixYa
asnowman


I have attached some photos of really bad convergence problems; your picture may not be exactly as bad as these.

848e9c1.jpg

8de3acd.jpg

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Sony kp-57ws510 SD Tech, soldering is no


I've used them before for replacement STK IC convergence chips. Works great! Good luck!

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1 Answer

Convergence of color with Mitsubishi Model #VS-60707


Your symptoms sounds like at least one damaged convergence IC.


You are correct you can sometimes rework the solder connections on each of these IC’s, although, if the convergence does not fix itself from time to time, you most likely do not have a bad solder connection. You will have a faulty IC. I recommend to replace them both at the same time because the chips legs can fall off due to the heat of the IC.

Please be sure to remove all of the white heat sink compound on the heat sink and apply a even coating over the back of the new IC’s. You should also bolt them down before you solder them in so that you have them at the correct height.

There are two and sometimes three very large IC’s that control the convergence in a big screen set. I believe that your set has two. They are secured to a very large aluminum heat sink. I think that the IC numbers will be IC8001, 80002.


The IC’s are large and black, you cannot miss them. They will usually have an STK-XXX number on them.


There are several schools of thought on the replacement of parts and I firmly believe that you get what you pay for, so don’t buy the cheapest IC’s that you can find. One company I worked for tried this and it only caused more work for the technicians, as we had to replace them with the more expensive ones in the end. I would think that you should be able to find these for around $60.00 each. If you can find the exact Mitsubishi part, even though the numbers on the front are the same, and they look exactly like the $10,00 ones, they are better and more reliable.

I hope this information allows you to resolve this issue.
If I have helped you, please help me, and rate this suggestion the highest FixYa rating. (Two Thumbs Up)
Please Note: If you can not rate this post with the highest rating, then please do not leave any rating. I am doing this for free and I do not think that any rating other that the best is needed.
If you need further assistance please comment to this post and I will try to help you further.

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1 Answer

Mitsubishi 1080 hd ws-65809 wont power up


This issue is almost always caused by a faulty Convergence IC inside your TV. These chips heat up and can become damaged over time. The most common cause I have seen for the picture distortion is the heat of the Convergence IC weakening the solder connection to the TV circuit board. If you look on various messages board you will see people rigging wooden dowels and other items to apply pressure to the chips in order to correct their picture issue. This works because when the solder joint is weakened the chip becomes loose and vibrations or pressure will cause it to work or not work correctly. Aside from all that information the correct fix is to have the IC chips replaces on your TV.

The solutions for this issue are as follows:

1. located a tv repair shop that will replace the parts for you. I had the same issue with my 65" Tv and the quote was $350 for the labor and parts.


2. You can ordered the IC replacements yourself online by going to google and looking up a reseller of the STK392-110 Convergence IC that is inside your model TV. You will need 2 of them and they cost around $6 each. If you have the soldering skills to remove the old chips and install the new ones this is by far the most cost effective route. It is a fairly simple process and guides can be found online.

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It requires some pretty good solder skills and there may be a couple of resistors that need to go also. Take that CG board out it probably doesn't need it and you will likely have to completly re-align the set after repairing it with the new CG in there, just the IC's and resistors usually require minimal alinment

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