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Following a loud bang sound I lost picture quality to the point that the blacks seem to cloud the screen. If I adjust the brightness levels up it helps but then the screen washes out and it is also very difficult to even see images with any type of ambiant light in the room. Is this worth repairing this 2 year old 52" LG Plasma?

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  • ronbrown4 Nov 17, 2008

    This is a 52 in LG plasma TV. What is wrong with it? What would it cost to fix it? Can I fix it? Why did it happen? Is it likely to happen again?

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Hi,
It seems that your LG Plasma fly back is damaged or ICs that supplying power to fly back are blowup there for it supply unmanageable waves to picture tube. You will take Hardware repairing for it.

Let me know If I can further help you regards this problem.

Regards
nidostyle

Posted on Nov 17, 2008

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The loud pop sounds like it may have been one of the capacitors in the power supply board. check for a POPPED cap (rare) and if there is one, test the components in the related circuit - as SOMETHING had to happen to make a cap fail like that - maybe a voltage regulator? give it a look..

Posted on Nov 17, 2008

  • futureloginn
    futureloginn Nov 20, 2008

     This could be a high voltage arcing problem. It could also be a main power supply buzzing from ...


  • futureloginn
    futureloginn Nov 20, 2008

    Check the distribution amplifier by disconnecting all speaker wires from the output ...


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Sure it is worth, call LG and buy a warranty extension, this will cover the whole repair cost.

You find LG number listed on the owner manual.

Posted on Nov 17, 2008

  • Ginko
    Ginko Nov 17, 2008

    Contact LG , using the number from user manual or the one listed on the LG website.

    Here is also a private provider selling warranty extension, but I do not know if it covers your area : ProTech 3 Three Year Extended warranty for LG

    Ask detailed information on conditions if you buy from private.

    One year extension from GE will cost $150 or so, and will cover all repairs for one year.


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1 Answer

Screen dim, black has green in it, contrast and brightness = shin


Since you have replaced the Color Wheel, it sounds like you have not adjusted the Index Delay in the service menu. First reset all of the picture settings you have adjusted back to original factory settings. Then on your Samsung TV Remote and with the TV OFF, Press Mute,Power,123. This will turn on the set and put you in the Service menu. Look for the top setting and select or scroll to the OPTION setting and select and look for INDEX DELAY and select that. Once you have the Index Delay selected use the right and left buttons on the remote to adjust for a picture the has no abnormal coloring and while looking at a program adjust for when the blacks look black with no abnormal coloring. Once that is done, turn off the set then turn the set back on. Now the picture should look normal.

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CONTRAST ADJUSTMENT


it is best to shut the color level to the lowest setting then try t balance the screens to achieve the best black and white picture. then turn up your color level. Your brightness level should also be set to 50 % then when you adjust for the best B&W picture. You will have better color and brightness when you reset your color and brightness levels.

I am further looking into ur problem..

Goodluck..

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1 Answer

Dark picture


Hmm my dad's old t.v. just cut out on him it took awile to turn on this my be the end of ur tv so this might be a power problem but older t.v. loose there colour on the screen my uncle had a like 10-15 year old t.v the screen was like green when it was light but when u turned of the light or closed the blind's it's picture was ok so try that.

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I have a sony kdf-46e2000, there is a pinkish stripe on the top and bottom of the screen, what is causing that?


Looks to me as an serious (but not uncommon) PSP board problem with Sony plasmas. Contact a Sony service center.

What problems have people had with quality control on these displays? Are they covered under warranty?
  1. Certain displays emitted an extremely loud buzz. This was covered by warranty repair.
  2. Certain displays had a problem with the Y/C delay on their S-video input. This was also correctable.
  3. One person reported red vertical lines on his display. Was this covered by warranty? Was it an input problem or a pixel problem?
  4. Afew bad pixels here and there are not covered under warranty. Largeclusters are generally covered. It's up to Sonys discretion. On the plus side, however, bad pixels are becoming increasingly rare. Mostpeople are reporting no bad pixels at all!
CALIBRATINGWhat needs to be calibrated on a plasma?
You needto calibrate most of the same things that need to be calibrated onother displays. About the only things that don't need to be done areconvergence and geometry. You can usually tinker with picture size andposition, but there's no need to deal with keystone or pincushionadjustments, etc.What is white level? What is black level? How are they adjusted?
Theadjustment for white level is usually labeled "Picture" (as onPanasonics) or "Contrast". "Brightness", on the other hand, refers tothe black level. Yes, this is apallingly counter intuitive. This FAQuses the terms "white level" and "black level", since they betterdescribe what you're actually adjusting, and they're the terms used byAvia and Video Essentials.
How do I adjust hue and saturation?
In another mysterious choice of terms, hue is controlled by the "Tint" setting,and saturation is controlled by the "Color" setting. This FAQ uses theterms "hue" and "saturation", since they're the terms used by Avia andVideo Essentials.
How do I set the white level on a plasma?
Youset the white level by adjusting the "Picture" setting. You will needto use a different test pattern than you would for a CRT. For both plasma displays and LCD displays, you should use the 10 IRE grayscalestep pattern. There are two criteria you want to match on your plasma.
First,you need to make sure the white level is low enough that your displayisn't thresholding (or clamping) bright levels. You should set thewhite level low enough that you can see each of the 10 IRE stepsdistinctly. The Sony seem not to exhibit clamping (in my limitedexperience), even at factory defaults, so this criterion may not beterribly useful.
Second, for the health of your display (e.g.to avoid burn-in), you should turn down the white level. Just becauseyour display can display blindingly bright pictures doesn't mean that it should. Plasma displays should be set between 21 fl and 25 fl light output; the Sony comeout of the factory at about 30 fl. On one ISF-calibrated Sony, 23fl was roughly equivalent to a Picture setting of -20 (in the usermenu, not the service menu). To set this precisely you'll need to bringin a calibration specialist, but you can do a lot of good by justdialing down the white level a lot. After seeing the display at 30 fl,23 fl will see very dim. But after a while, you'll find that 23 fl isplenty bright.
How do I set the black level on a plasma?
Youset the black level by adjusting the "Brightness" setting. You can usethe same test pattern you would use for any other display.
How do I calibrate grayscale (calibrate the color temperature)?
Unfortunately,this is one you can't do yourself. You need special equipment tomeasure the color. In fact, most ISF technicians lack the equipmentspecific to plasma calibration (a $15K gadget known as aspectroradiometer). But even the standard color measurement equipment(which calibrationists do have) will do a great job.
Thatsaid, one person who had his Sony display calibrated by an ISF specialist said that the Cinema / Warm setting was reasonably close to6500K out of the box. Using that setting is probably the best you'll doon your own.
If you're really determined to screw up yourdisplay, the RGB drive and cutoff settings in the service menu are used to adjust the color temperature.
How do I adjust the color decoder?
There are several issues here. Generally speaking, the Panasonic decoder seems topush blue a bit. The R-Y Axis Angle and B-Y Axis Gain in the servicemenu are used to correct this behavior.
There used to be aproblem on some Panasonics with the Y/C delay on the S-video input. Seethe Quality Control section for more information.
How do I adjust the gamma?
On the industrial model, there is a set of Advanced picture settings. Go to the Picture menu, turn Advanced on, and then hit the down-arrow. In the subsequentmenu you can adjust quite a few parameters, including select from a fewgamma settings.
This advanced menu appears to be missing from the consumer model.
How do I calibrate my consumer model given these missing menus?
Thereis apparently a way to activate these menus. Perhaps you can find acalibrationist or Panasonic technician would can turn them on longenough to do the calibration.
What's the overall calibration procedure?
In general, the order Avia sets out is the correct one. A more complete list is:
  1. White level (picture)
  2. Black level (brightness)
  3. Repeat (1) and (2) until you have a good balance.
  4. Grayscale (requires special hardware and mucking about in the service menu)
  5. Sharpness
  6. Hue and Saturation (tint and color)
  7. Color decoder (requires use of the service menu)
  8. Repeat (6) and (7) for red and green until you have a good balance.
SERVICE MENUHow do I access the service menu?
In a word, don't. See the service menu warningabove. If you're bound and determined to make use of the service menu,buy the service manual. It contains more than enough information foryou to ruin your display and/or kill yourself.

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