Question about Dell W3706MC 37 in. LCD HDTV

3 Answers

Dell 37in LCD Power-up Issue

Hi Experts, I certainly am no expert, but would really like to fix my 2 year old, out of warrenty, Dell tv...i.e. buy a replacement part direct..rather than pay the $1000 that I was quoted from the Dell Authorized OOW service provider, without parts, but included shipping. The issue is pretty simple...for the past month my tv screen has not consistently been turning on. When I press power, the blue light turns on, then there is a flicker of the screen and then nothing. If I turn it on and off it does the same thing, and it does not 'warm up' (ie go t the Dell 'warm up' screen and begin functioning). The blue light stays on and there are no other signs of failure except for the screen not turning on or properly powering up. My thought is that it has something to do with the power adaptor or something since everything else works fine when it works....I have been able to sort out some sort of solution by unplugging the tv before I go to bed and then when I need to use the tv, plug it in an it turnes on, (usually after being up-plugged for 12 hours or more). All of the features work fine and it is fully functional, but this power up issue might be related to the power adapter or something that required a 'discharge' or a reset. Can you please advise...Many, many thanks to anyone who can offer any support as other Dell TV customers know, there is not very much support out there at all.

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  • 2 more comments 
  • Chris May 27, 2008

    Is that why it resets and works normally after I leave it unplugged for 12 hours or so? Would this be a power issue or a 'main board' issue?

  • Chris May 27, 2008

    Thank you for the advice. It seems that the capacitors might be the issue. I have a question about your hairdryer explaination. Since 'cooling' down or completely discharging the tv enables the tv to work again the 'pre-heating' method would not work, I think, because when the capacitors are hot and I turn the tv off and then on, the screen does not work, it is only when I unplug the tv for 12 hours that it properly powers up. Another question, IF I decide to open up the tv, how long would I need to leave it completely unplugged to discharge it completely? 24 hours? 48 hours?

  • Chris May 27, 2008

    Thank you for your advice. I can definatly try using a multimeter, but the more that I think about it, the more it sounds like a board issue because the tv works fine for hours when I unplug it and let it 'discharge or 'reset' for 12 hours. However if I turn it on after letting it sit for 12 hours (functioning normally) and then turn it off 5 minutes later, it will not start up properly again until I unplug the tv and let it sit for another 12 hours. So that would not be a function of the power adaptor since the amps and volts should be constant whether the tv is just turning on or whether it has been on for 5 hours. What do you think?

  • Chris May 27, 2008

    Thank you for your advice and help. I think that that would be the best approach to take a look at the board. How long should I let it discharge before opening it up? Many thanks!

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  • Expert
  • 139 Answers

What ill suggest if you r very sure the problem is not from the power adapter that is the one that goes to the wall then i think they should be some open circuits or broken lines. what yu do is lose the case of the lcd carefully then bring out the panel study it carefully for open circuits then resolder these open circuit n join every broken lines possibly use a brish to clean the panel for dust. couple it back carefully power on n see.most times open circuits may result to yr kind of problem
hope this helps
thank u

Posted on May 27, 2008

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  • Master
  • 2,712 Answers

Could be you have a couple of faulty capacitors on the power board. I would check for those first.
However, if you have no prior experience, I would recommend getting a qualified TV guy to handle this, as there are voltages in the TV that can kill..

As for replacement components, you should be able to get them pretty cheaply at your local electronics store and not have to pay the exorbitant sums DELL is charging..

Posted on May 27, 2008

  • 2 more comments 
  • Swilin Sampson
    Swilin Sampson May 27, 2008

    Here are some more tips:


    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 of a bust capacitor (not
    same model):





















    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!





  • Swilin Sampson
    Swilin Sampson May 27, 2008

    It seems to be an issue with the power board and not the main board..I think the capacitors are not discharging properly. However, only a site inspection of the internals of the TV can provide any real clue..

  • Swilin Sampson
    Swilin Sampson May 27, 2008

    Well, the longer it is left unplugged, the better. 10-12 hours would be fine, but to be on the safer side, I'd say 24 hrs.

    The hairdyer trick seems to work for some people, but I just provided all the possible solutions I could think of..no harm in trying, if it can save you $1000..:)


  • Swilin Sampson
    Swilin Sampson May 27, 2008

    Yes..the issue is most likely the power board..

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  • Dell Master
  • 19,396 Answers

The safety switch is coming up, there is an internal fault, may be overvoltage or something has blown

Posted on May 27, 2008

  • Ginko
    Ginko May 27, 2008

    If it is just the power adapter you can get replacement from dell. To test the power adapter you need a Multi-Meter, you need to check the voltage coming out and that power is not being cut off.
    If it is the power adapter you can just replace it. Buy the spare from dell, or type the power adapter part number in google and see what you find.
    It can also be an overheating problem, some board, like audio board and main pcb inside has a termic sensor shutting down the device when overheating. In this case I suggest calling a repairman

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