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TV techs - what's this?

Discussion in 'Electronic Repair' started by Totoblue, Jun 27, 2007.

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  1. Totoblue

    Totoblue Guest

    Dead Loewe Arcada 8672 ZP (article number 57437 L32). This is a 100Hz 4:3
    CRT TV. I think it is from 1997 judging by the "By 634/97/Ro" on the back.

    No picture or menu displayed.

    Funny black mark on the back of the tube
    http://www.flickr.com/photos/totoblue/sets/72157600492269015/
    Not sure if it is a scorch mark or it's supposed to be there.
    Anyone know?

    When plugged in, the two front panel lights come on and the every 5 seconds
    or so, it sounds like a relay clicks (it doesn't sound like it is arcing)
    and IIRC the front panel green light goes out for a fraction of a second at
    the same time. The red light is on and blinks when the remote is used.
    Nothing displayed on the screen (not even menus).

    Any got any ideas? I'm not wanting to fix it myself but want to know a ball
    park repair cost before I spend any money even to get a quote.
     
  2. line output transformer and / or line output transistor. vertical
    output chip is known to go sc. And ( sorry ) all this could have
    cooked the "jungle chip ".
     
  3. Frank

    Frank Guest

    I think you are a funny guy





    Dead Loewe Arcada 8672 ZP (article number 57437 L32). This is a 100Hz 4:3
    CRT TV. I think it is from 1997 judging by the "By 634/97/Ro" on the back.

    No picture or menu displayed.

    Funny black mark on the back of the tube
    http://www.flickr.com/photos/totoblue/sets/72157600492269015/
    Not sure if it is a scorch mark or it's supposed to be there.
    Anyone know?

    When plugged in, the two front panel lights come on and the every 5 seconds
    or so, it sounds like a relay clicks (it doesn't sound like it is arcing)
    and IIRC the front panel green light goes out for a fraction of a second at
    the same time. The red light is on and blinks when the remote is used.
    Nothing displayed on the screen (not even menus).

    Any got any ideas? I'm not wanting to fix it myself but want to know a ball
    park repair cost before I spend any money even to get a quote.
     
  4. "Totoblue" wrote...
    I don't see any "funny black mark"?
    Are you refering to the center ~1/3 of the tube envelope
    above the neck/yoke that appears to be a darker color?
    That is a very normal appearance. The gray portion on
    either side (and presumably below the neck) is a conductive
    paint called "Aquadag" The tube appears to be "darker"
    perhaps in that center section where you are looking
    through the clear glass envelope at the metalization on
    the inside. http://en.wikipedia.org/wiki/Aquadag

    The Aquadag on the outside is grounded (via those "wire
    braids" wrapped around it) and the outside and the inside
    of the tube form a giant capacitor which filters the high
    voltage. Note that "capacitor" can hold a very nasty jolt
    if you don't properly discharge it (as you remove the big
    red high-voltage wire).
    Sounds like a basic power supply problem. Those things are
    very tricky to work on even with the proper equipment and
    information. Definitely NOT a DIY repair job. It is almost
    certainly not worth as much as it would cost to repair. It may
    not even be worth as much as it costs to get an estimate.
    Welcome to disposable consumer goods.
     
  5. Rudolf

    Rudolf Guest

    FBT.

    I do not suggest you fix it yourself. Too dangerous and not a trvial fix.

    Where are you?

    If in Melbourne e-mail me at rudolflATrumatech.com

    Rudolf
     
  6. Meat Plow

    Meat Plow Guest

    You haven't seen the back of a crt before? I know you'd like to fix it
    yourself but do you think you have the skills and do you have basic test
    equipment?
     
  7. JANA

    JANA Guest

    The back of the CRT looks normal.

    You will not be able to fix the set yourself without the proper service
    manual, test equipment, and training.

    The flashing lights means that there is a failure in either the power
    supply, or the one of the scan amplifiers, or in the high voltage section.
    Proper troubleshooting procedures will be required to service your set. Then
    you will require a source for the proper parts.

    I would suggest you give the set out for an estimate. I can tell you in
    advance, that the service for your set may be on the expensive side,
    considering the age of the set.

    Note, there are very serious safety issues when trying to service a TV set,
    and you are not properly trained and equipped.

    --

    JANA
    _____


    Dead Loewe Arcada 8672 ZP (article number 57437 L32). This is a 100Hz 4:3
    CRT TV. I think it is from 1997 judging by the "By 634/97/Ro" on the back.

    No picture or menu displayed.

    Funny black mark on the back of the tube
    http://www.flickr.com/photos/totoblue/sets/72157600492269015/
    Not sure if it is a scorch mark or it's supposed to be there.
    Anyone know?

    When plugged in, the two front panel lights come on and the every 5 seconds
    or so, it sounds like a relay clicks (it doesn't sound like it is arcing)
    and IIRC the front panel green light goes out for a fraction of a second at
    the same time. The red light is on and blinks when the remote is used.
    Nothing displayed on the screen (not even menus).

    Any got any ideas? I'm not wanting to fix it myself but want to know a ball
    park repair cost before I spend any money even to get a quote.
     
  8. Totoblue

    Totoblue Guest

    Yes that's what I was referring to. Thanks.
     
  9. Totoblue

    Totoblue Guest

    I have and had no intention of fixing it myself. That's why I wrote "I'm
    not wanting to fix it myself but want to know a ball park repair cost
    before I spend any money even to get a quote."

    Thanks for your concern.

    I only opened it up to see if there was anything obviously fried. If half
    of the components were fried, it'd obviously be not worth getting repaired.
     
  10. Meat Plow

    Meat Plow Guest

    Sorry I didn't see that.
    Like JANA mentioned it could be costly considering the age. With the
    symptoms you described I doubt you would see anything "fried". If you have
    the money, get yourself a new set I think you would be happier. :)
     
  11. Frank

    Frank Guest

    Yeah but I wish I could of earnt money fixing TV'S by assessing "what was
    wrong" just by "LOOKING" at it

    It never worked and it never will, as they say "how long is a piece of
    string" most of the time you don't know how much the cost is until you are
    finished.






    Sorry I didn't see that.
    repaired.

    Like JANA mentioned it could be costly considering the age. With the
    symptoms you described I doubt you would see anything "fried". If you have
    the money, get yourself a new set I think you would be happier. :)
     
  12. Rudolf

    Rudolf Guest

    Depends on where you are going to take it.

    I can probably do it for about $250.

    Rudolf
     
  13. person

    person Guest

    You know there is a recall on some Loewe televisions ?
     
  14. Tom N

    Tom N Guest

    Yes, thanks. I plugged in the serial number etc to the web page and this
    one is not affected.
     
  15. LOOKING AT IT involves several things , usually u say to a tech , "
    can u look at this , its not working and its making a buzzing sound ..."

    i`m sure every tech has a LOOK to see if there are any signs of obvious
    , burnt components , dry solder joints , burnt tracks , corroded connectors
    , any liquids etc... spilled inside ,

    mark k
     
  16. Rudolf

    Rudolf Guest

    LCD ones, I beleive.

    Rudolf
     
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