Question about LG DU-52SZ61D TV

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LG DU52sz61d - Just changed bulb and the picture is still real dim

Except for a two inch vertical strip on the right hand side.

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5 Suggested Answers

SOURCE: Red Stripe, right side

Follow-up. I found the slip on which the LG tech wrote down the part number for the board to fix the vertical red stripe. I was mistaken in my previous post. It was not the Z-Drive board. The board you want is:

X DRIVE BOARD; Part 6871QRH043A
Type in the part number in a search engine and yuo will find multiple places to purchase. Ebay may be the cheapest. That's where I got another part which got my picture back. I did not buy this part myself because now that I have my picture back, I do not want to screw it up, so I live with the red stripe.

Posted on Jun 06, 2008

Shuttle83
  • 1139 Answers

SOURCE: Very dim picture but bulb is good

Hello onsitecomps/David
With all of this bumping and knocking, still the problem you are having should not be occurring. This is due to the fact that the light engine is basically protected from that kind of activity. Now I feel that I have to explain how the light engine works, because there are a few things I am going to ask you and I want you to know why I am asking you these specific questions.
First of all a light engine works in the following manner:
A digitized video signal is sent into the signal and control bus of a DLP processor the signal is used to activate the transistors that control the mirrors that reflect light from the light source (the bulb) to the screen (more explained in next sentence) of the TV. The light from the mirrors then is reflected into a color wheel which spins at a rate which allows the individual monochromatic lights from the mirrors to be reflected with its proper color sequence (this is what creates the color picture from the monochromatic light from the DLP processor). This is a high level description, yet it is accurate for the questions I am about to ask.
1) Is the color wheel moving? (you can tell because it will make a fan like noise when it is turning)
2) Is the bulb at its proper luminance? (you can tell by using a light meter)
3) Are all the lenses in place? (you can tell by opening the light engine and inspecting the lenses)
4) Is the light from the bulb striking the DLP processor mirrors? (This sounds like what is not happening in your case, this or the processor is bad, being blocked by an obstruction, or out of alignment)
I believe that the last question is what is happening in your case, please correct me if you think that my assessment might be incorrect.
As for doing any of the work yourself, I would advise against this because this is what may have happened in the first place with the first owner. (who knows for sure). I would suggest getting this repaired by a qualified TV repair shop since the placement of these parts and the handling is very critical. If you do plan on doing this yourself you will need the following items:
1) voltmeter (to measure the voltage levels on the DLP processor, and the other points on the circuit board)
2) schematic diagram with service manual (To see where parts are located and to indicate where test points are)
3) light level power meter or you can use a temperature meter and do the conversion formula for watts to lumens (heat energy to light energy)   4) Ohmmeter (to measure resistances of components and circuit devices)
5) Signal generator (to create/generate a reference signal source with which to test against)
Now, if you know what these pieces of test equipment are and how to use them great have at it, if not, my original statement hold true: get a qualified TV repair person to take care of this issue.
I hope this helps,
Thank you,
Shuttle83

Posted on Jul 23, 2008

albertv29
  • 87 Answers

SOURCE: green vertical stripes down right hand side of screen, no picture

Single color vertical stripes are an indication of a defective panel or panel control.

Posted on Jan 23, 2009

  • 1 Answer

SOURCE: the left side of my LG plasma has vertical lines.

It sounds to me like one or more of your buffer boards has gone bad. You will probably have to have it looked at.

Posted on Apr 07, 2009

  • 187 Answers

SOURCE: blue vertical line thru picture

It is called "Thin vertical lines" and change colors depending on the background color.
It is fixable but there are several components that can show this sympton.

You will need a tech to fix it in order to save money (because you do not want to buy a board you dont know if will fix it).
Possible Solutions:
Replace Timer Control Board, if it is not fixed
Replace Sustain Board.

One of those boards needs to be replaced and I wrote the most likely first.

Posted on May 27, 2009

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