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Olevia LT-30HV (LCD). The screen is black but there is sound.

I have an Olevia LT-30HV (LCD). The screen is black but there is sound. I have already done the following: Turned tv off for 1 hr....picture still black. Turned tv off for 1 day...picture still black. Plugged tv into a surge protector.....tv came on!!! Picture lasted for the day, about 6 hrs. The next day it didnt, picture was back to black. The following day it worked again for several hours...the next day and every day since than the screen has been black. I saw a posting about troubleshooting but since I have no electronic experience whatsoever I quickly became lost. Any ideas on what part I need to replace in layman's terms would be greatly appreciated! Thank you!

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  • felinefan Jul 21, 2010

    Thank you for your response! I have narrowed down the problem to the backlight inverter. Do you know where I can purchase one and how to install it? I have a Olevia LT 30 HV. Thanks!

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What likely happened is when you did a "hard boot" you reset the microprocessor (computer) inside and then it worked. A "soft boot" by just turning it off and on will not do a full reset. The hard boot was when you completely unplugged AC power from the wall and that is the only way to hard boot a tv. (atleast any modern tv).
So yes, you have an issue with the digital circuitry or micro in the tv set.. this usually resides on a "main" board, or "digital main" board...
there is a possibility that you have other bad parts like bad capacitors (caps) that could be causing it to malfunction, but they usually will just screw up when cold, then work fine when it gets warm. semiconductors - transistors,diodes, MICROs will malfunction when they get hot, this is likely your issue. I would first open it up an look for anything that is bad, bulging caps are easy to find and could cause this issue, although not quite run of the mill. Here is my tutorial on bad caps:

http://www.fixya.com/support/r5000889-repairing_tv_just_clicks_over_over

if you don't find bad caps, suspect the digital main board
or main board -- on shopjimmy.com theyre calling it a system board or main board
http://www.shopjimmy.com/catalogsearch/result/index/q/LT30HV/
i would check the numbers on your board and see what matches up.
There is a rare posibility that it is something else, I would run it until it malfunctions and then try the hard boot again, see if it works for another 6 hours or whatever... if it works and then it goes right out, something is overheating, and still hot. You can use some "freeze spray" found at tech parts distributors online like www.jameco.com to troubleshoot and "freeze" the board that you suspect is overheating.. when you get it to work again for some time, ie it cooled down, then you've found your bad part. the overheating is something that should be normally functionable, but when the parts fail they cannot handle the extreme temps anymore. Anyways, let me know what I can do to help. We can fix this for sure, but if you don't want to dive in, might want to call in a pro. Let me know..

Posted on Jul 12, 2010

  • thielectronick
    thielectronick Jul 22, 2010

    i'd usually use shopjimmy but the part is out of stock:

    http://www.shopjimmy.com/backlight-inver...

    you can check your numbers to see if they match and get more reference part numbers
    hey found one on ebay, its listed as another brand but they use the same part

    http://cgi.ebay.com/Darfon-V144-001-LCD-...

    check it out, see if it matches, if so should be your best bet
    make sure if you are not positive, that you can return the part if needed, or you may be taking a gamble, best of luck!


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