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Most times upon powering on the TV I will get sound, but no picture. If you turn it off, and back on, most times you will get both.

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  • bearcat77777 May 11, 2010

    This is a DYNEX flatscreen. Model DX-LCD37. I have repair tools, and have fixed many things, although more line voltage items than electronics though. I would like to fix this myself. Look forward to hearing from you.

  • bearcat77777 May 11, 2010

    I checked the backlight, and it apears that is the problem with the no picture.(I see images with a flashlight shined at an angle to TV). But why would you think that the backlight or power supply is bad, since this is an intermitent problem? Do you have some more particular advice of what to look for in the set? areas to look, or inspect?



    Thanks

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  • Master
  • 10,515 Answers

Hi,

Kindly Tell me the Make and Model of the TV?

This is an Internal Fault. Would you Like to Repair it yourself?

If Yes, do you have Tools like Multimeter, Screw Driver, Soldering Iron and other Electrical Equipments.

By Turning it OFF, you are resetting the TV that would Temporary Resolve the problem.

Let me know,if you want to Fix this Yourself.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on May 10, 2010

  • 1 more comment 
  • taran_2005
    taran_2005 May 11, 2010

    Thanks for your response!!

    First make sure to hit the menu button on the TV's remote and if nothing is there then friend while the set is on turn a bright flashlight on and shine at angle into the set push the TV menu button if you can see a image then your backlight is not working. You can also check the transformers they are close to were the wires plug into the panel, make sure all transformers read the same amount of resistance if not you have found a bad one. Now you will have to check to see if the power supply is sending 24v to the backlight, if not the power supply is bad. Cost backlights around 150.00 and power supplies around 100.00.

    Let me know,once done.

    Hope i helped you.

    Thanks for using ' Fixya ' and have a nice day!!


  • taran_2005
    taran_2005 May 11, 2010

    Thanks for your response!!

    I have seen this Problem many times with Different sets, though i never worked on this. However, most of the Flat Panel TV worked on the same Principle's. Even though it is Intermittent, a Bad Inverter or Bad Caps / Faulty Caps on Power Supply Board or Faulty Circuitry might Cause the same.Bad Inverter could Cause Flashing On and Off as well as Intermittent issue's. The reason that it worked for few seconds / minutes / hours is that by Turning it OFF, you are actually Resetting the TV.

    The main Problem is that Flashlight Test is the ONLY way to Diagnose probability of Inverter Board being bad. For Further Diagnosis, you need to have Special Test Equipments.

    At this time, i would say, You shine the flashlight directly into the darkscreen - in a dim or darkened room. If you see faint images of the picture with the flashlight shining in the screen, then the inverter has failed.

    Let em know,if needed further assistance.

    Hope i helped you.

    Thanks for using ' Fixya ' and have a nice day!!


  • taran_2005
    taran_2005 May 11, 2010

    Thanks for your response!!

    Do let me know the Update.

    Thanks!!


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