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When i turn on my lg 42ld690 tv, the screen is v bright. like a negative image. i swith the tv on off a few times then its fine?

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You may have failing T-CON board. You need to do some voltage checking and visual inspection inside the TV.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx

Please post back what you find.

Posted on Aug 03, 2010

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Posted on Jan 02, 2017

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My lg TV of three and half years has a black screen with images flashin Intermittently. The sound is fine


What is the model number? If it is only 3 years old, I suspect you have a LCD TV with LED backlight. You quite possibly have a failed LED backlight.

Many LG TVs of this age are starting to fail due to over-worked LEDs in the backlight which create the white light that illuminates the LCD image.

The symptom is TV turns on and off ok, gets sound on the connected video inputs, but has an otherwise black screen with no video on display. You can try to operate the TV near a bright window with lots of sunlight and see if you can perceive a faint image on the screen. A flashlight is often not bright enough to be helpful.

Most of the time, an LED will fail as a short circuit and still allow power to flow through it to other LEDs that will still light up. If one of these LEDs fails as an "open circuit", or if several LEDs have failed in the same circuit, then the power supply detects a fault and shuts the TV down. If the LED is intermittent, you may have flickering. Think of having one light bulb burn out in a string of Christmas lights and having all the lights go out until the bad bulb is replaced... kind of the same thing.

Your TV circuits boards should be fine. In my opinion your TV requires a backlight repair which requires complete disassembly of the entire TV including disassembly of the panel which is a difficult process.

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I will check what toshiba says about this problem, but in the meantime, make sure your tv is not overheating, make sure all airvents are open, you said you took it apart so I supose you cleaned all the dust and so on.

Il get back to you.

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T con board is responsible for the final image that appears on set. If there are anomalies or issues with it they can be traced to that board.

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The color static, if we are talking about the same thing, is usually a digital signal interference. Check cables, and digital converter if used.

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Looks like the Video card, or Video chip has bought the farm
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good luck

caypianan@yahoo.com

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