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Toshiba CRT TV Fuzzy image

Discussion in 'Troubleshooting and Repair' started by Bobi, May 2, 2016.

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  1. Bobi

    Bobi

    2
    1
    May 2, 2016
    So I recently bought an old CRT Toshiba TV to play retro games on it, and all was working well for about a week. Now when i turn it on, the image is fuzzy the tv makes high pitched noise and about 25s later the image gradually stabilizes and the noise also stops like it needs to heat up. Also day by day this problem only gets worse.

    [​IMG]
    ^^^^TV image on start
    --------------------------------------------

    [​IMG]
    ^^^^TV image about 20sec after start
    ---------------------------------------------------

    Also if the TV is working for an hour and then i turn it off, then turn it on again it works fine no fuzzy image or high pitched noises.

    I have some beginner's experience in electronics. Please help me.
     
  2. 73's de Edd

    73's de Edd

    2,805
    1,176
    Aug 21, 2015
    Sir Bobi . . . . .

    Give us the brand and the model number of that Television.
    Sound like you have some electrolytic capacitors that have just drifted down in capacitive value / effectiveness and increased their ESR to just barely working at an unstable threshold.
    With the real info being in the statement "improves after warmup"
    Get Mama Cass's blow drier at the ready and be prepared to also provide some close up photo s of the units . . .because . . .would you believe . . .we are currently as blind as bats here.


    73's de Edd
     
    Last edited by a moderator: May 2, 2016
    Bobi likes this.
  3. Heliman

    Heliman

    65
    13
    Feb 4, 2016
    Is the high pitch noise coming from the speaker or is it coming from inside the TV?
     
    Bobi likes this.
  4. Bobi

    Bobi

    2
    1
    May 2, 2016
    Thanx you were right, i took the multimeter, checked every single capacitor and found out that 4 of them all near the flyback transformer were with wrong capacitance and one of them was shorted out, so i replaced them with new ones and the TV works perfectly. This fix costed me less than 2$. Thanx again :) Woohoo
     
    davenn likes this.
  5. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    The high pitch noise is a classical fly-back problem.
    Glad to hear you fixed it.
     
    Bobi likes this.
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