Question about Westinghouse LTV-27w7 7 in. LCD HDTV

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Backlighting issues on tv set (I think). Screen goes extremely dark after about 30 min. of viewing. Does not return to orginial brightness unless unit is left off for a long period of time

TV works fine for first 30 min or so, then goes extremely dark (still slightly visible). Audio fine, no burnt smell, etc. If you turn the set off for a while, picture will return to normal. After a moment or so, backlight seems like its failing and then screen gets abnormally dark again. I've changed the "brightness" settings and the case remains the same. Any ideas as to what I should do. The unit is about 2 years old (problem started 6 months after initial purchase).

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Lcd tv sets are lit by small glass florescent tubes called cold cathodes and, are powered by: ballasts called inverters... these go out just like your office florescent lighting the parts can be purchased online from electronic parts houses and, are easily replaced

Posted on May 22, 2009

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Posted on Jan 02, 2017

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I have a 75" Samsung LED TV, and the top position of the screen is going dark, is that a power supply issue?


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When i turn on my samsung tv picture come 1 second and then goes completly black can you please tell me what is problem.


Hi, I'm afraid i think I know what the culprit is. It sounds like you have a weakened power supply for the backlight section. This will be the case especially if you have voices from t.v. with no picture ( actually can see shadows on screen-just is dark from lack of backlighting ) Your only resort besides having it put in the shop is to try and let the set rest long enough to come on for perhaps a few minutes. If you can acheive this it is possible to turn down the brightness in the sets " MENU " under settings. If you have ever adjusted the sharpness,color,contrast this is where you will need to be. Just turn down the brightness by abought half, and that should stop tv from going dark,if not it needs to be repaired. I hope this has been of some use-good luck, Prodzilla

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Tv goes black and can still hear sound, then it will shut off, then turn back on. will repeat after 5 mins


Hey iterry,

I have the same TV with what seems to be the same problem (screen off, audio remains until turning off->on); posted in several places (including here) but yet to receive a conclusive advice.

Please check the following:

- Does the screen turn off exactly 5 min. later - or when high brightness frames come up (could be 1...2...15 min. into the run;you can check that by pausing on a dark frame for a while)?

- Try altering the set to 4:3, low definition (did mine through my UVerse menus) as well as manually reducing the brightness settings; see if this gives you longer screen activity (I often manage for several hours, until some stupid commercial has a few seconds of a bright-white screen).

If we are indeed both in the same boat, my findings thus far are:
This is not a lamp issue (changed, no difference); not a color wheel issue (changed a couple of months before this ****); probably not a temperature issue - though I'm still checking that.

I'm hoping it's the ballast; will soon check and LYK. Good luck.

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2 Answers

Raymarine E120, after 4h on display went dark in


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Nov 16, 2009 | Raymarine M1500 15 in. Flat Panel LCD...

1 Answer

No backlight


A couple things to try:

1st check the backlight settings

Turn on Backlighting and Control Brightness To use your device in dark environments, enable the automatic backlighting feature:
  1. From the Jump screen, press MENU t02003-15.gif then select Settings > Battery & Display.

  2. In the second group box, select the Turn on backlight when using device check box.

  3. Highlight, then select the Brightness slider to open it for editing. Roll the TRACKBALL right to increase brightness; roll the TRACKBALL left to decrease brightness. After you've made the adjustment, press the TRACKBALL to exit edit mode. t02007-55.jpg

  4. Select the length of time you want backlighting to stay on from the Turn off after pop-up menu.

  5. To use the device's light meter while the backlight is on, select the Use ambient light sensor check box.

  6. Press JUMP t02003-14.gif to return to the Jump screen and save your setting.
Now, when you press any button or key, or flip open the screen, backlighting will turn on for the set amount of time. Note that as long as you press a key or button before the set time elapses, the backlight will stay on.
Tips:
  • Even if you have not selected automatic backlighting, you can turn on backlighting at any time by pressing MENU t02003-15.gif + JUMP t02003-14.gif . The backlight will remain on for the time specified in the Backlight Turn off after pop-up menu.

  • When in key guard mode, you can turn on the backlight by pressing the RIGHT SHOULDER t02003-66.gif button.
If it still does not work, then you can try resetting the flex cable to the lcd.

Reseat the SidekickFlex cable

If that doesn't fix it then a new lcd assy will take care of the issue. they run about 45 dollars on ebay.

Sidekick LCD screens

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2 Answers

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Hi MG86,

Most PS2 games are dark and auto brightness controls will casue your LCD tv to brighten up automatically in response the dark video coming from PS2 games. I suggest you get into the menu settings of your TV and find a setting that will shut off the auto picture controls.

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1 Answer

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1. A Cold solder in the Video Output stage power supply.

2. A bad Electrolytic Capacitor in the above Video Output stage.

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Dunno how much they will cost in your country. Try to look for a 100mfd, 160V Capacitor. Close your eyes and replace. generally does the trick.

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1 Answer

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1 Answer

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