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27" Hitachi tv model:TN-77000,chassis:G9LXU

Discussion in 'Electronic Repair' started by Sidney, Sep 28, 2003.

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  1. Sidney

    Sidney Guest

    27" Hitachi stereo tv model:TN-77000,chassis:G9LXU,year:Aug 1990
    wooden cabinet (table top model,not a floor model)assembled in Point
    Claire,Quebe,Canada.
    The tv has HV,sound but no raster at all not even OSD after about few
    minutes the picture comes in very dark,I increased the brightness on
    the flyback but the retrace lines are barely visible,I replaced the
    4.7 Uf,250v heater cap on the crt board which was fine but still dark
    screen.The 3 guns are lit bright,I can download the free service
    manual from:

    http://www.hitachiserviceusa.com
    http://823312-000:/Service/Manuals/

    but I would rather have a "quick answer" than to spend hours
    troubleshooting,here are other models that share the same chassis:

    GT-7881K
    CT-7881
    TE-67002

    To familiarize you with this chassis here are some common parts:

    CRT Panasonic # M68JUA98X (made in USA)
    Flyback # 2435376 (location:T702)
    Yoke # 2444251
    IC401=LA4270 (sound o/p ic)
    Q702=2SD1959
    IC601=UPC1498H (vert o/p ic)

    I looked at 5 or so repair tips sites but found no common repair tips
    for such a chassis with such a problem,any have any tips for
    me?.Thanks in advance.

    Sidney
    Dartmouth,Nova Scotia
    Canada
    http://www.herald.ns.ca/cgi-bin/home/displayphoto?2002/12/22+126.raw+1019+Business
    http://www.herald.ns.ca/stories/2002/12/22/fBusiness126.raw.html
     
  2. Jerry G.

    Jerry G. Guest

    Check to see if the biases to the CRT guns are correct. Check the high
    voltage, and the main power supply outputs. By your description, this
    sounds like a weak CRT. Doing the proper checks will verify this.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    =========================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    Instruments http://www.zoom-one.com/glgtech.htm
    =========================================


    27" Hitachi stereo tv model:TN-77000,chassis:G9LXU,year:Aug 1990
    wooden cabinet (table top model,not a floor model)assembled in Point
    Claire,Quebe,Canada.
    The tv has HV,sound but no raster at all not even OSD after about few
    minutes the picture comes in very dark,I increased the brightness on
    the flyback but the retrace lines are barely visible,I replaced the
    4.7 Uf,250v heater cap on the crt board which was fine but still dark
    screen.The 3 guns are lit bright,I can download the free service
    manual from:

    http://www.hitachiserviceusa.com
    http://823312-000:/Service/Manuals/

    but I would rather have a "quick answer" than to spend hours
    troubleshooting,here are other models that share the same chassis:

    GT-7881K
    CT-7881
    TE-67002

    To familiarize you with this chassis here are some common parts:

    CRT Panasonic # M68JUA98X (made in USA)
    Flyback # 2435376 (location:T702)
    Yoke # 2444251
    IC401=LA4270 (sound o/p ic)
    Q702=2SD1959
    IC601=UPC1498H (vert o/p ic)

    I looked at 5 or so repair tips sites but found no common repair tips
    for such a chassis with such a problem,any have any tips for
    me?.Thanks in advance.

    Sidney
    Dartmouth,Nova Scotia
    Canada
    http://www.herald.ns.ca/cgi-bin/home/displayphoto?2002/12/22+126.raw+1019+Business
    http://www.herald.ns.ca/stories/2002/12/22/fBusiness126.raw.html
     
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