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I have a bit a problem I would love to hear your advice on. I have a 37 LG LCD TV (37LC7D) and have owned it since about last Sept. This has been a great TV and I have had zero problems with it. I came home today, turned it on, and noticed the picture brightness flickering a bit. Then the screen went black but I could still here sound (though the TV speakers). Then the set just powered itself off. Tried to re-start it, and similar thing. Stays on for a bit (less than a minute) then goes black, with sound. Then just powers off. I let the TV sit for a while, and then tried it again. The picture lasted for a while (maybe 2 mins) then brightness abruptly faded and then entire picture started to flash for about 30 secs, then completely went black but still with sound. After about 10-30 secs the set just powers completely off.

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1. Try this - hold the menu button down for 10 seconds. TV should power up; you will have to turn off front panel buttons on menu.

2. You can also try plugging in the TV through the USB on its panel to a computer or USB charger, and it may work. However, this is only a temporary solution.

3. Powering down the set or putting it in standby may have allowed the power supply to cool. Weak capacitors often go out of spec when they cool, thus preventing a section of the power supply from firing up properly again. There is a simple trick...just warm the back of the TV with a hair dryer for 5-7 mins after you have unplugged the TV. Look for the little areas of holes in the back panel of TV. Use these as your guide at where to use the hairdryer, but don't hold the dryer too close (say 5-6inches away). (Make sure the dryer is on High heat). If the TV doesn't turn on after you have heated it up (like it tries to come on but then turns off) you need to unplug the TV again, this resets it. And repeat those steps till it works. Resetting the TV after it fails to turn on is the key. Also, just leave the TV on. Don't turn in off. Since it is LCD, it doesn't take much power...only a few bucks extra a month for your utility bill.

4. A circuit board may crack about some of the larger components mounted on it. You can inspect the PCB's for fractures, and then repair them. It may also be poor soldering that has failed. I would be checking for these things first.


5. If you want to go in for a long term solution, you can easily replace the whole power board or just change the faulty capacitors. You will have to open the back panel and take a look. You can make out which are faulty, because their caps will be swollen on top. Here's a sample pic:
I have a bit a - 5409f03.jpg
Check the specifications of the faulty capacitors, and get the replacements from your local electronics shop. If you are comfortable with this, you can use a pair of needle nose pliers to G-E-N-T-L-Y pull out the defunct capacitors. Once that is done, solder in the new capacitors carefully. If are unsure how to do this, try to get a friend who knows how to do this kinda stuff do it for you, or get a qualified technician. Warning: If you do not have a background in electronics repair, or are inexperienced, get a qualified technician to do it for you.


REMEMBER there are very dangerous voltages inside a TV that can KILL. Be sure to work SAFE when dealing with electricity. DISCONNECT THE POWER BEFORE YOU DO ANYTHING.

Hope that helps...Should you have any further questions, please feel free to post them here.

P.S. - If you find that the solution/answer I provided led you to, or resulted in a fix, please close the ticket with a FixYa! rating. I would be very grateful for your show of appreciation.
If it hasn’t, please do not assign a rating just yet. Please post back as to what steps you took, results, etc, and I will try to assist you further as best I can. I am here at your service.

Thank you for using FIXYA!

Cheers!
IrishDruid

Posted on May 01, 2008

  • Swilin Sampson
    Swilin Sampson May 03, 2008

    Hi,




    Just wanted to inquire if your issue is resolved, or if there is anything
    further I can do to assist you…





    If you find that the solution/answer I provided led you
    to, or resulted in a fix, please take a moment to close the ticket with a FixYa!
    rating under my solution.
    I would be very grateful for your show of appreciation.





    Should you have any further questions, please feel free to
    post them here.





    Thank you for using FIXYA!





    Cheers!


    IrishDruid

  • Swilin Sampson
    Swilin Sampson May 31, 2008

    Hi,




    Just wanted to inquire if your issue is resolved, or if there is anything
    further I can do to assist you…





    P.S. -You can rate this solution with one of
    four votes, if you feel your issue is resolved.






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      - The solution provides great advice on how to solve the problem.
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