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ViewSonic P815 VCDTS21492

Hi!
I have intermitent off/on video the screen was black and restart.
I found this problem is origined by spark gaps s671 and s371.
Wich is the function of theys? Is for prevent an over voltage?
And wich is the origin of the problem if i think is an over voltage?
If it is can i go down it? perhaps at some regulator on flyback?
or adding a resistor in order to low the exitation perhaps at base on tr driving the HT ?
Thankfully for your answers in advance
Sifliginius
PD: I found a lot of ViewSsonic different models with the same problem.

Posted by on

  • SIFLIGINIUS Oct 03, 2008

    Hi!
    Thanks for your answer.
    Do you have the gentless to send me the schematic for this specific
    model? Monitor ViewSonic P815 VCDTS21492-4M HV12S
    In order to take out the components that you has mentioned.
    And if its possible some theorical explication for this action,
    only for to learn, i'm only a ham electronic.

    email sifliginius@hotmail.com

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  • 65 Answers

1.Remove all spark gapecapacitors at RGB cathodes and G2, G1 cathodes.
2. Remove G2 pf (G2 cathode to Ground).
3.check video section any dry points.
4. Replace boosting FET (power supply output to LOT supply)

Posted on Oct 03, 2008

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