TV slow coming on

Discussion in 'General Electronics Chat' started by logicrules, Mar 5, 2013.

  1. logicrules

    Thread Starter Member

    May 3, 2009
    16
    0
    Howdy,
    I have a weird situation with my Envision LCD TV; it’s acting like an old CRT tube set, taking its time coming on. It seems to be taking more time lately, right now maybe 2 minutes to turn on the video and sound. It flickers at first and then pops on and no apparent problems. I know something is amiss, but what?
    Does anyone know what the problem is and how I might fix it?

    Any help will be appreciated.
     
  2. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    At a guess, bad caps (High ESR, bulged, etc) in the power supply.
     
  3. logicrules

    Thread Starter Member

    May 3, 2009
    16
    0
    Hi,
    Thanks for your reply. I can cope with the caps explanation but you lost me with the “high ESR”. It’s been a long time since I was involved in electronic repair. Then I was fresh out of high school. Now I’m asking 73 to move over. Maybe I need a dictionary on electronics. All I managed to secure in a search referred to blood pressure or something in that area.
    Anyhoo, what is high ESR? And how will it affect my attempts to repair?
     
  4. alim

    Senior Member

    Dec 27, 2005
    113
    1
    Hi logic, high ESR refers to the state of an electrolytic capacitor. It means equivalent series resistance. A capacitor with high ESR renders the cap. incapable to carry out its function. You will use an ESR meter to check them , they can be read in circuit, the meter would have a chart to compare your readings , the ESR depends on capacitance and voltage rating.
     
  5. speekergeek

    New Member

    Mar 6, 2013
    2
    0
    could also be your LCD backlight (generally fluorescent tube)

    The TV could be trying over and over to strike, or light the tube. and it takes many attempts.

    Try checking your power supply caps FIRST as suggested.

    Usually they are visibly bulging

    http://en.wikipedia.org/wiki/Capacitor_plague
     
  6. logicrules

    Thread Starter Member

    May 3, 2009
    16
    0
    Thank you for your input(s), now I have a point to start. I hope the TV survives my tinkering. I will let you know the results when it comes out of surgery.
     
  7. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    It must have caught it from my old Sony. I have the exact same problem. It now takes about four minutes to show the picture, used to be about ten seconds.

    I assume it's a power supply problem. The vast majority of problems are power supply related, this one has all the earmarks. Probably bad caps (at least).
     
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