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Screen totally black

Tesco Technika tv/DVD. Sound is perfect, but just a totally black screen. If I press the display button on remote, picture comes back on for a second then back to black screen again.

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  • Contributor
  • 56 Answers

Try to play around with the cables as you might have not inserted all the cable properly .

Posted on Feb 13, 2014

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Posted on Jan 02, 2017

SOURCE: DIBOSS tv shows no picture

Me too! Apparently Diboss are no longer trading, so no help there. I am aware that these panels have a common power supply issue, the faulty chip is only available from China and the last one I fitted only lastest a couple of days. However the fault described above is not the same. I've checked the psu outputs; all are fine and nothing changes when the picture disappears, therefore I can assume that I'm not looking at a PSU fault. As Iain says above, it appears to be a signal link, however I have no picture on ANY input and without circuit diagrams I cannot find any component that's common to all the various inputs. This leads me to think that either the backlight, or the screen itself is faulty. I'll keep trying and if I get it sorted I will report back.

Jon

Posted on Sep 24, 2008

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SOURCE: 37LC7D, screen blank, cannot power off manually or w/remote

Hi, I would buy your TV

Posted on Dec 14, 2008

skotkolr
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SOURCE: Sharp LCD TV, Screen goes black sound stays on

Capacitors on the power pack are going bad they need to be replaced that should fix the problem.

Posted on Apr 07, 2009

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SOURCE: 19'' Dynex TV does not come up as a Computer Monitor.

Follow these steps on the remote :
Press Input,
scroll down and select VGA.

Posted on Jan 03, 2010

  • 4234 Answers

SOURCE: Sound stays on, but no picture- goes black and stays that way.

This unit should still be under warranty and should be taken in for warranty service. Any attempt to access the interior will void the warranty. It is important that a complete description of the problem like you entered here be taken along when you bring the set in for service. This will insure that the servicer be able to reproduce the problem and resolve it.

From your description (and as a servicer), I would be looking for a component that is heat sensitive. These types of problems are fairly easy to locate and resolve.

Please take this in for warranty service and update this when you find out the details.

Thanks,
Dan

Posted on May 04, 2010

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2 Answers

Monitor goes black - green light stays on


My screen is black, why do I not have a picture?
Answer Antenna is not hooked up to television.
  • Make sure that the antenna cable is correctly connected to the television. If it doesn't work there appears to be no signal.
Problem is caused by television broadcast
  1. Push 'INFO' button.
  2. If the screen shows channel number (1, 2, 3, etc) try another channel. Not all channels broadcast at all times.
  3. You may have a signal problem. Contact cable provider or local broadcaster regarding the specific channel.
Television is in EXT or SIDE mode, and there is no external source provided, so screen mute (black screen) is activated.
  1. Push NEXT SOURCE button on the remote.
  2. On the screen appears all sorces.
  3. Press the UP button to switch to the TV mode.
If you are using an accessory device (DVD, DVR, or VCR), be sure the device is on and running.
Blank screen when connecting to the accessory (DVD, STB, PC) device via HDMI to HDMI.

Answer
  • Make sure the cable is well connected .
  • To check which connection is selected, Press the i+ button on the remote control.
  1. When you see Blue mute / blank screen and the i+ display does not indicate any video resolution indication then there is no valid signal detected.
    • Make sure the HDMI output of the accessory is valid by changing the video output resolution to a resolution which the TV can handle.
  2. When you see a blank screen and the i+ display shows a video resolution indication then the connection is correct.
    • The blank screen is caused by the accessory device and not by the TV.
    • To detect and remedy the problem caused by the accessory device, check the instruction manual of this device.
  3. If the problem remains : reselect the HDMI external source input by changing to the other HDMI input and back to the connected HDMI :
    1. Press AV on the remote
    2. Press up and then ok
    3. Press AV again
    4. Press down and ok
    5. The compatibility check process between TV and accessory device will start over again.
  4. Reset (switch off and back on) the TV and also reset the accessory device.

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Chris, the problem could be almost any where. As a TV servicer, my course of action would be to test the voltage in the power supply. I would look for a bad capacitor in the power suppy. This capacitor may be bulged or skinned. You will need an ESR meter to locate a bad capacitor. A bad capacitor may look fine, when it is not. I have not worked on this model, I would certainly start with the power supply. Hope this clues you into a fix.

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1 Answer

I have a 32''lcd technika tv bought from tesco under 2 years ago.it has sound but no picture


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Pick the remote control press the menu button if the menu comes up then adjust the contrast till you see the picture clearly.
If this does not work take then the picture IC is blown i would advice to refer this to an expert to take a closer look so as to avoid total condemnation of the unit.
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If you can get the tv to display the blue blackground(usually happens when there is no antenna or cable feed to tv) check to see if the whole screen is a solid blue, if it shows discolored areas around the screen then you might have to "demag" the screen. See if you can rent a demad coil from a tv shop and with tv on turn the coil in circular movements all over the front of screen till blue is solid.good luck!

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