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Technika LCD22-218 TV

Discussion in 'Troubleshooting and Repair' started by Paul Mac, Oct 22, 2014.

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  1. Paul Mac

    Paul Mac

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    Oct 22, 2014
    Hi

    My TV comes on from cold and works for about 5-10 mins then the screen goes black, I can still hear audio. My electronics skills is very rusty, I used to fix monitors when you could still desolder and replace a transistor. Would this be a problem with the inverter or the AV board ?

    Any ideas where i can get a replacement ? the full spec is TECHNIKA LCD M22/36B-GB-TCDI-UK REF 22-218

    Thanks in advance for any input.
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Can you tell if the backlight is still on? It should be obvious in a darkened room.

    If it's not on, look closely at the screen, is the image still there (it might help to use a torch at an angle)
     
  3. Paul Mac

    Paul Mac

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    Oct 22, 2014
    No there doesnt appear to be a backlight I checked in a dark room.

    It has stopped coming on for 5 mins before going off now. On switch on it now flashes a Blue screen with TECHNIKA written across in white then the screen goes immediatly dark, no backlight.

    Thanks for your help steve
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    OK, so you *may* have a backlight issue.

    Is this a LED or CCFL unit?

    If it's CCFL then it may be possible to replace the CCFL tubes, and/or fix/replace the inverter.

    The former (replacing CCFL) may be quite fiddly -- I've done it once and I really wouldn't want to do it again. Although in fairness in my case I had to completely disassemble the LCD panel.
     
  5. Paul Mac

    Paul Mac

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    0
    Oct 22, 2014
    Im not quite sure what you mean by a ccfl unit how do I tell ?
     
  6. Paul Mac

    Paul Mac

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    Oct 22, 2014
    bump
     
  7. davenn

    davenn Moderator

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    Sep 5, 2009
    LCD panel TV's use either LEDs or CCFL tubes ( fluoro tubes) to backlight the screen
    Steve is wanting you to establish which one it is
    Usually one lit by fluoro tube(s) will have a EHT voltage supply around 3000V

    I think its about time for some pix of the main board(s) Sharp and Well Lit to see if there is anything obvious

    Dave
     
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