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Discussion in 'Electronic Repair' started by Peter Kolbe, Dec 31, 2007.

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  1. Peter Kolbe

    Peter Kolbe Guest

    74CM Colour Television
    Chassis EC2975
    or TCB00892
    or 40-2916-MT-MA

    Tube had a green gun that had died. (Heating up the Filaments, and then
    firing 240v through a 50w bulb between G1 and GK, managed to give me about
    10 minutes before the green died again).

    Replaced with another tube of same size (Using the same Yolk that is on the
    replacement tube [I did read the faq])

    My Picture is focused at the center, but at the edges it starts to get
    blurry, and I can see that it is overrunning the screen border by at least
    10cm on each side.
    My guess is that this is beacuse of the different yolk impedance.
    Anybody know how to correct this (resistors in parralel / series with the
    Yolk maybe),

    I would also like (for interest sake) to know how to access this sets
    service menu [if somebody could please help].

    BTW I am doing this one as a hobby, as I would like to get a TV going for my
    lounge [and i was given this tv with a bad tube]

  2. Peter Kolbe

    Peter Kolbe Guest

    Just an update.
    Got the Service Manual from Local dealer.

    Easily managed to adjust settings (in service menu) to get picture working
    fine with the other tube.

    Was actually surprised that the set gave me such a wide range to bring the
    Vertical and Horizontal Amplitudes down.

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