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There's sound but no pic on my 27" lcd tv - Projection Televisions

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  • jstjarre Sep 19, 2008

    My ilo lcd tv has sound but no picture. Model # v27dmbx

  • jstjarre Sep 19, 2008

    My ilo lcd tv has sound but no picture. Model # v27dmbx

  • jstjarre Sep 20, 2008

    My ilo lcd tv has sound but no picture. Model # v27dmbx

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Like others have said, this is most likely an Inverter that has gone bad. If you have experience with high-voltage electronics, then by all means test it and check that it is good otherwise find someone that is qualified to do it for you. If it turns out to not be it (slim chance) let me know and I will tell you what else you can check

Posted on Sep 20, 2008

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LCD TV TroubleshootingThe defective LCD TV may have the following common symptoms:

Symptom: No picture on screen but LCD TV still has sound.
Solutions: The problem is cause by defective inverter. Replacing ivnerter will solve hte problem. Symptom: Screen flash on and off between 1/2 to a few seconds, but power indicate light stays on and TV still has sound.
Solutions: The problem is cause by defective inverter. Symptom: Blue Screen but no picture
Solutions: The problem is cause by defective Main Board(AD Board). In some cases, this problem may cause by the defective Screen Controller board. Thsi board is mounting on teh back of LCD TV Scree. Symptom: Power light stays on but no display and sound
Solutions: The problem is cause by defective Main Board(AD Board) or Power supply board. Symptom: No Power or Power indicate light does not lits
Solutions: The problem could cause either by defective Power supply board or defective Main Board(AD Board). Symptom: Screen is half dim and half bright
Solutions: The problem is cause by defective LCD Panel.It needs to be replace.


If the PSU is running ok and there are no any leds glowing on the front check to see it the fluorescent tubes or CCFL (on each side) are glowing they usually have their own supply generators powered or inverter by 12v from PSU. The inverter is the one to power up the LCD-TV CCFL (cold cathode fluorescent lights). An inverter control circuit with a resonant frequency modulation function provides a control circuit module that can modulate different resonant frequencies externally to fit loads of different modes without changing the inverter components such as a voltage transformer or redesigning the circuit layout. The RC oscillation circuit of a resonant frequency controller of the invention includes several separate resistors, and the separate resistors of the RC oscillation circuit are coupled to at least one switcher to form an open circuit or a closed circuit to determine the total resistance of the RC oscillation circuit for modulating different resonant frequencies. Inverter have a life span or life time hours,its better you replaced with a new one,so it works better again.Click this links for more information about inverter , http://www.byfort.com/ccfllamps.htm

Hope it may helps you;

Regards,
VOTIT

Posted on Sep 20, 2008

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Hi,

Your concern was pointed to by another expert bunnydawg. Being an LCD TV, no protection circuitry kicking in, no blinking lights and everything seems OK albeit the display, pls try turning it on, shine a flashlight diagonally across the screen where the volume level normally is shown, using the remote, increase or decrease the volume. If you can see semblance of the volume level, then it could possibly be:

  • CCF lamps (cold cathode florescent lamps) that provide the backlight; and/or
  • the inverter that provides the high frequency high voltage power to the lamps.
It is quite rare for all the CCF lamps to burn out at the same time. Having said this then it is very possible that it is the inverter. In some units, the inverter could be triggered off in the absence of an intelligent video signal, power saving mode, sleep timer.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Sep 20, 2008

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It would be nice if you post here model and brand of your lcd tv.

Posted on Sep 19, 2008

  • Shahid Electronics
    Shahid Electronics Sep 19, 2008

    Please click ILO TV problem link and get a little bit details of problem.

    In my opinion you need local tv tech person to fix this issue. If repair cost is greater, buy a new tv.

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  • Projection T... Master
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The high voltage circuit has failed, I know from past expeariance that the board is around $500 and then the labor and set up after repair, the fact is that sadly a new TV is going to be your best choice, I think LCD's are the best.

Posted on Sep 19, 2008

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