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Auto convergence not working 142cm LG rptv

Top left hand corner about 1 square foot is fuzzy with ghost images. tried auto convergence with no success. the rest of the screen is perfect problem free. problem started after watching dvd

Posted by mr w on

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Mike Longo

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If the colors will not line up in one corner of a standard projection set, it usually means that one of the convergence output IC's has burned out and needs to be replaced. This is very common. If you do not have experience replacing parts and soldering PC boards, then the defective IC should be replaced and the convergence circuits realigned by a qualified tech familiar with convergence circuits in projection sets.

Posted on Aug 28, 2007

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Anonymous

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I have replaced the convergence I/Cs with no luck, I did notice that the I/Cs do not get warm at all, So do I have a power problem? When I select auto convergence it goes through its paces but all the colour blocks are distorted and not aligned at all, Can anyone tell me the maunual convergence alignment proceedure or have a circuit and/or manual.

I am not a TV tecnician however I am a communications tech and have no problem with soldering etc.

Thanks in Advance

Posted on Sep 20, 2008

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2 Answers

Our tv just started having a fuzzy image and the auto focus function aborts during the red color alignment. is there a manual alignment I can do to fix it.


What does this fuzzy image look like? Does it have ghosting shadows. Of course it is possible to align red manually from the convergence menu. But first lets confirm that it is indeed a convergence related problem.

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Tv have a convergence problems,it dead.Tv convergence board is dead.Require changing the 2 STK convergence ICS and some or all it resistors.To solved the tv convergence problems.Tries Websites like Tvrepairworld.com,Tvrepairkits.com to buy a convergencce kit.To replaced those convergence parts on the board.

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These procedures are from the owners manual, go into menu and then picture quality and then: Convergence The Convergence feature lets you adjust the TV’s three tubes. When the TV tubes’ images are precisely aligned, they create the color images you see on the screen. Over time, the picture can drift out of alignment (this is normal). If your picture seems fuzzy or has a yellow tint, using Convergence could correct this misalignment. Only one convergence is needed for all inputs, regardless of the signal format. Note: Make sure the TV has been on for at least 30 minutes (TV needs to warm up for best results) before starting Auto Converge or Red/Blue Centering. When you select the Convergence feature, a submenu appears with three options: Auto Converge Automatically aligns the projection lenses to self-correct color images. You’ll see flashing squares of color dance across the screen (this is normal). Note: After performing auto convergence, use the Blue Centering and Red Centering menus to fine tune convergence in the center of the screen, if necessary. Blue Centering Aligns the blue and green images to fine-tune the picture. Red Centering Aligns the red and green images to fine-tune the picture. Note: The ability to change channels is disabled when adjusting the convergence options. The TV must be tuned to a usable signal to converge the picture.

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you will need to replace 2 stk ic [ parts ] after that the technician will have to realign the picture, sometime also some resistors get bad along with one or 2 fuses

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The second common problem with Projection TV sets is dull video, halos around objects, white looking video, or red overpowers the screen. This is commonly caused by the fluid in the lens being clouded over.


You can find more details and solutions here on Fixya at the following link below. Or click HERE

3d884ac.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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http://www.techlore.com/blog/entry/19694/Sony-Convergence-Repair-My-Sony-TV-has-a-distorted-picture-/

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AKAI PT5598HD


Your set has what is know as "convergence problem" because of the bowed lines and ghost in different colors,is really not an easy solution,the set should have 3 amplifiers(one for each color)and they need to be replaced with an exact replacement,sometimes just by replacing them the aligment should be close but soemtimes you nned to get into the service menu to do some adjustments,the amps(IC's) are mounted on heat sinks and all 3 have the same part number on its face,they normally read STK--- ---,every set uses different amps,If you are familiar with tv service you have now a place to start working but if you are not too familiar be safe and call for help from a servicer.Let Us know if you need more information.

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