Question about Toshiba TZ50V51 50" Rear Projection Television

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Multiple images my projection tv shows three images at the same time

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  • tigery58 Nov 24, 2008

    I have the red image not in convergence with the others and the red line seems to bend too.  Could you please tell me which IC chip I need to change?or how can I locate the problems?

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Your TV is having convergence problems, there are 2 integrated circuits on the convergence section to be replaced, possibly there are some resistors blown also.
After the integrated circuit are replaced your technicican will have to clean the mirror and lens and realign the picture I am in Los Angeles

Saludes a todos los de centro America y sur America ; oops tambien los de North America. - Tv.repair at yahoo.com

Jose

Posted on Nov 21, 2008

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CONVERGENCE PROBLEM. FIND A HONEST TV TECH. MAYBE A $300 REPAIR

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You need to replace Both STK ICs . They are Big Black ICs and will have PN# on them
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Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.
This is a very common failure on these projection sets and a fairly simple DIY fix. All projection sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.
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1 Answer

Converging problem


This is a rear projection TV that uses three color "guns" in a cathode ray tube . They are no longer converging at the screen. The convergence problem is usually a sign of something else gone wrong with the high voltage.
Do NOT attempt to open this set yourself. This type of TV can have LETHAL voltages inside for WEEKS after it is unplugged. The repair and convergence calibration will require a qualified service technician.

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I have Sony KP-46WT500 Projection TV. For some time it appears convergence went bad. I see multiple images, especially at edges and corners. As many as 3 images Red, Blue and Green. I am an Electronics...


Hi,
It would be great to assist you in Sony convergence issue.
As you said, for some time TV shows bad convergence in picture that shows its matter of lose/ dry solder joints in D board, specially on convergence out ICs pins that need to be re-solder.
There are 2 big black ICs mounted on aluminum heat sink on D Board of TV, below image shows D Board location in TV.
Resolder pins of these 2 ICs and also check any other dry/ cold solder joints in circuit board. I do not think of IC replacement as problem occurs some time.
Let me know if you have additional question.
Thanks.

bc7880f.jpg

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Try this with TV off Press and Hold at same time ch- and vol - until TV comes on It should either let you into service mode or start convergence Automatically

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Three separate images about 4-5 inch apart on my TV


Symptoms shows TV has problem of faliure of convergence out ICs. (2 ICs in TV) and need to be replaced.Let me know do you want to repair it at your own? ...
... if yes, it is necessary to have experience of TV repair and basic electronics knowledge.

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Check the regulator and convergences ICs....accordianman

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1 Answer

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Its two maybe three issues that your having trouble with. First thing is the convergence. That problem could be a cold solder connection on the convergence IC's or the Ic's have a thermal problem, as after they heat up they go bad. The second is the popping. This could be an issue with the rear channel Audio output Ic intermittanly shorting and shutting down the set, or it could be a bad ground around the picture tubes, or a leaky hi voltage block, or a second anode lead going to the picture tubes could be split. The other common problem with this set is the STR#### regulator IC in the power supply. Now unless your a tech you shouldnt attempt any of these repairs as there is very high voltage in this set and could cause great harm to you. seek the help of an authorized repair shop for Toshiba. Try this # if you cant find one in your area 800-457-7777 Good Luck

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