Question about LG RU-52SZ30 52" Rear Projection Television

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Have a lg 54 rear projection tv .curving on the top and bottom of the screen and convergence cross is not in the centre of the screen

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Hi, I used to work in Best Buy and one of the key things about rear projection TVs and the reason they push those service plans on you is that the tubes/colors need to be calibrated each year. You can do this yourself by checking out the following website:  

http://lgknowledgebase.com/kb/index.php?View=entry&EntryID=3229 

If you are not able to adjust the convergence using the remote you will need to replace the convergence chips. 

Typical Symptoms

1) Convergence menu does not work for one or more colors.  
Such as: Red moves up,down, but left or right fails. 

2) Screen is bowed looking.

If you have one or more of the problems above you need to replace the convergence chips. You can get a kit and instructions from www.TvRepairKits.com  

Hope this helps :) 

Posted on Sep 17, 2009

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Posted on Jan 02, 2017

  • 317 Answers

SOURCE: Green Convergence on a JVC 56" rear projection t.v.

find a reputable tv guy in your area and they will be able to repair for you by replacing the convergence amps john

Posted on Sep 11, 2007

  • 3 Answers

SOURCE: Samsung PCN5425R 54 in. Rear Projection

Ksherer,

The adjustments that your are trying to make, I do from standard menu. I did not have to enter service mode with mute 1-8-2 to make them. I have same model PCN5425R

Posted on Jan 31, 2008

  • 22 Answers

SOURCE: 50hx70 blue projection light is concaced at top and bottom of tv

When the convergence amplifier ICs go bad (STK392-xxx), they RARELY cause more than one color to go out. The fact that the top and bottom of the picture are effected indicates the vertical convergence IC. Replace both, and while you're in there check the bias resistors... it is likely one of these is open. Once the ICs have been replaced (as well as any open resistors), customer convergence followed up with the auto convergence should do the trick.

Posted on Mar 10, 2009

  • 476 Answers

SOURCE: i have a sony rear projection tv, it has red lines

color convergence is acting up on your sony, usually the convergence power ic's are to blame. replacing both is recommended(mounted on heavy looking metal dissipators)

Posted on Jul 31, 2009

  • 8457 Answers

SOURCE: Philips 55PP8620/79 rear projection picture ok but not centred

NO need a new IC.

Posted on Aug 17, 2009

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I have a Phillips 60" rear projection TV. recently


Tv have a problems known as a convergence problems,it is dead.The tv convergence board it is dead,that why ur tv picture are R,G,B colors lines mis alignments,have colors shadows picture or 3D picture lood alike?The tv convergence board require changes 2 STK convergence ICS and some or all of it resistors too.To fixed the tv convergence board to solved the tv convergence picture problems.The shop will cost u like $300-350 for parts and labors.

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Akai (PTH5498) 54" rear projection TV with red and green ghosting and large curve in the picture at the top and bottom of the screen. Unable to fix using manual convergence. Thinking it must be the...


Hello:

Yes is is your convergence IC's. One has gone bad, but consider replacing both of them because if one has gone bad then the other is not far behind. They are located on the middle board of your set. They are mounted on a large heatsink, the part # should be STK-392-040. Replace these and your set will work fine again.

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Curved picture at top and bottom


if it is bowing from top and bottom your looking at a convergance problem if you keep using your tv soon there will be no picture at all when the board crashes... convergance board needs to be replaced... hope this helps..

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Curved red lines on the screen and the picture is distorted


This is a convergence problem that can be either poor solder connections on the convergence ICs or defective ICs. If you can solder you can fix this yourself. Update this if you wish to attempt the repair and I'll supply additional details and instructions.

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Mar 23, 2009 | Samsung PCL545R 54" Rear Projection...

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50hx70 blue projection light is concaced at top and bottom of tv


When the convergence amplifier ICs go bad (STK392-xxx), they RARELY cause more than one color to go out. The fact that the top and bottom of the picture are effected indicates the vertical convergence IC. Replace both, and while you're in there check the bias resistors... it is likely one of these is open. Once the ICs have been replaced (as well as any open resistors), customer convergence followed up with the auto convergence should do the trick.

Nov 19, 2008 | Toshiba 50HX70 50" Rear Projection...

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Red and green wavy lines


If the distortion that you see can be described as somewhat of a 3-D picture, the problem is teh convergence circuit and this can be fixed easily. Also, if you can solder, you can fix this yourself. If you wish to do this, please update this and I'll provide you with some instructions.

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Sep 12, 2008 | Akai PT5492S 54" Rear Projection...

1 Answer

Screen appears curved on top and bottom


One or more colors can't be adjusted when when using the convergence menu. Screen is bowed in but stationary.

Solution: 

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kit for your exact model. The kit inlcludes a photo instruction guide, original Sanyo STK chips, convergence resistors, etc. Everything you need to fix it yourself. Its an easy fix. 

Jul 22, 2008 | Philips 55PW9363 55" Rear Projection...

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Red & green lines


Sounds like you have hardware failure in the convergence circuit. Some combination of the IC's, fuses, and/or resistors has failed. Repair cost is $250-$400 parts & labor

Dec 02, 2007 | Akai PTH5498 54" Rear Projection...

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