Question about LG RU-52SZ51D 52" Rear Projection HDTV-Ready Television

2 Answers

Diagonal Shadow from the top left corner

Hi
My LG RU052SZ51D TV has a diagonal pyramid shaped shadow extending from the top left corner of the screen.The first ten inches are dark (but picture still visible through it, and the for the next ten inches it is a lighter shadow but extends all the way across to the top right (diagonally)
What could be the problem, and am I looking at a major repair here?

Thanks,

Dee

Posted by on

  • deeomolina Dec 24, 2008

    What does "a problem with the IC on the main board mean, and how does it cause the problem I am having?

×

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

  • Expert
  • 327 Answers

The following is when a single CRT or tube in a projection TV set starts to get weak. It is the same for a CRT when any one of its electron-guns starts to go weaker than the others. 

On any CRT based set either with a single CRT or with seperate projection CRT's, as the tube(s) (CRT's) get weak their emission goes down. One of the symptoms is that the beam focus gets softer. 

When a CRT goes weak the beam current will decrease. This lowers the mass or intensity of the electron beam. This makes the beam width wider, and thus the image focus is softer. Having a wider beam in a single CRT or single colour section of a CRT's electron gun also means that there will be more beam width overlap in comparison to the other CRT's or the other electron-guns in the case of a single CRT. This will give the appearance of an overlap or edging especialy with sharp or thin lines. 

There is also a symptom where the convergence can get less accurate as the convergence control circuits age. This means that the scan tracking between each of the CRT's or the electron-guns in a single CRT start to not be able to accurately keep converged to each other. This will produce a border effect between the beam position accross the scanning of the screen. 

Sometimes with a projection CRT set if there are separate focus controls in the high voltage (HV) section for each of the colours the beam focus may be able to be cheated if the CRT is not too weak. In most CRT sets the focus voltage is shared between all the colour channels, and thus there is no possiblity to control each channel individualy. 

With weak CRT's there are other factors that come in to effect. One big one is that the colour tracking gets impossible to be accurate. This is because the gain liniarity of the tube becomes out of spec. As each of the CRT's or the electron-guns in a single tube become weak they will lose their tracking accuracy in relation to each other. In the design of the drive circuits of the better TV sets there are some auto circuits to try to make sure that the tracking is stable. But, when the electron-guns become too weak the circuits run out of range.

Posted on Dec 24, 2008

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Expert
  • 100 Answers

Its the problem with the ic on the main board.it requires minor repair.

Posted on Dec 24, 2008

  • mayiassistu Dec 24, 2008

    You need to replace the two convergence Ics and most likelt 4 of the 6.8 Ohm 1 watt resistors. You can get replacement ICs and resistors at the following link and they provide free instalation instructions with pictures so you can do the repair yourself. Here is the link.
    http://servicemanuals.vstore.ca/



×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Diagonal lines at 45 degree angle from left top to right bottom of screen


db:: 4.31::Diagonal lines on tm2 screen? fz - Hivmr

www.hivmr.com/db/fzap9jk8dp87mcjk3cc9jsp7fzxk7pz1
There are faint 45 degree diagonal lines covering my brand new tm2 LCD ... with some static looking diagonal lines going from bottom left to top right. .... DB:3.01:Dv6113 Us - Computer Freezes Showing Diagonal Lines On Screen aj ... Also there arediagonal lines that run across the screen at about a 30 degree angle.

3M Privacy Filter for Laptop diagonal-14.1" viewing screen ...

www.amazon.com/3M...diagonal-14.../B00006B8A9

Amazon.com, Inc.
Rating: 3.8 - ‎1,617 reviews
Amazon.com: 3M Privacy Filter for Laptop diagonal-14.1" viewing screen ... Premium 14.0 Inch Privacy Screen for Widescreen Laptop or Computer Monitor .... 3M™ Privacy Filters create a 30-degree cone of vision so on-screen data is .... You'll also notice a large "3M PF14.1W" printed in the top right hand corner of the filter.

FZ190: Faint Diagonal lines on screen? ' NotebookReview

forum.notebookreview.com > ... > VAIO / Sony

Jan 27, 2016 | Computers & Internet

1 Answer

Top edge of my photo is a black diagonal shadow


Sounds like it could be vignetting from either a lens hood or an accessory. Are you seeing this in all photos or flash only? If flash, sometimes a wide shot with a lens hood on will block the flash output and cause the described shadow line.

Feb 08, 2014 | Canon Eos Cameras

1 Answer

A dark shadow is diagonal across the top of the screen. Can it be fixed?


hi,
Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} The most common problem for this complaint is contaminated coolant for the picture tubes. If you look directly into the three picture tubes you will probably see a haze in the blue one. This is fairly common but requires a knowledgeable service man to take care of.


May 25, 2010 | Toshiba 50HM66 52" Television

1 Answer

Prints light shadow down right side with diagonal white stripes


One of 2 things is defective. The toner or the fuser. Take off the rear door and look at the 2 large rollers. (One is orange on those models I believe.) See if the defect can be seen on the fuser.

Oct 26, 2009 | HP LaserJet 4050n Printer

1 Answer

Corner tints and white lines


it can be a picture tube problem. moreover, check if your tv is dusty inside it . clear it with blower and try again.


regards,

Jul 31, 2008 | JVC AV-32120 32" TV

1 Answer

CS 35607 Mitsubishi TV No Video


Hi,

Please CLICK HERE and once you are at the site enter your model no.

Apr 18, 2008 | Mitsubishi CS-35607 TV

1 Answer

Screen lines on MacBook.


Sounds like dropped pixels.  My first guess is the computer has been dropped on its corner, with the pixel dropout radiating diagonally from the corner.
My saint bernard sat on my g3 lombard, and I have vertical pixel dropout because of it, from the top of the screen to the bottom.
And no, it is not normal for a macbook to have lines across the screen.
Linda h.

Mar 19, 2008 | Apple MacBook PC Notebook

2 Answers

Diagonal Shadow


Often a piece of foam, debris or such can get in between the lamp and color wheel which can cause the symptom your describeing.

Mar 17, 2008 | Samsung HLN617W 61" Rear Projection HDTV

1 Answer

Row of pixels out


If the shadow is coming from the top straight down to the bottom of the screen then that means the panel display unit is bad. I hope you have the extended warranty coverage. If not, then buy a new TV.


C-Dog

Feb 09, 2008 | Televison & Video

Not finding what you are looking for?
LG RU-52SZ51D 52" Rear Projection HDTV-Ready Television Logo

Related Topics:

30 people viewed this question

Ask a Question

Usually answered in minutes!

Top LG Televison & Video Experts

The Knight
The Knight

Level 3 Expert

72640 Answers

Les Dickinson
Les Dickinson

Level 3 Expert

18381 Answers

Henry  Thomas
Henry Thomas

Level 3 Expert

1074 Answers

Are you a LG Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...