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capacitor markings ?

Discussion in 'Electronic Repair' started by runcorn_rat, Dec 23, 2006.

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  1. runcorn_rat

    runcorn_rat Guest

    Hi there
    I have a Phillips 28pw6006 /05, with a L01.1E board in .
    and its got a psu fault i was informed it may be a faulty cap,
    it just keeps switching its self off every couple of seconds
    sometimes after firing up the audio comes on but the screen dosent.

    so having took the back off i found a green ceramic disc capacitor
    board marked 9505, and the barkings of 9R0 on it , its about the size of a
    new 5p piece and a little thicker .

    does anyone know what value this is , and what voltage t may be?

    i susepect it as 9pf , but dont have a clue of the voltage
    lots of the electrolytics in the tv set range from 16v to 250v
    but like i said this is a ceramic cap ..

    any thought would be great

    de paul
     
  2. Arfa Daily

    Arfa Daily Guest

    9505 is the component designation, and is typical of the way Philips do it.
    Their board ID's tell you nothing about what the component actually is,
    unlike other manufacturers who call their components " C " and " R " and " Q
    " . 9R0 is not a marking that I have ever seen on any disc ceramic cap. Are
    you sure that the device is not a thermistor or VDR ? What makes you suspect
    that this component is faulty ?

    Arfa
     
  3. Jim Land

    Jim Land Guest

    Replace all the electrolytic capacitors before you bother with the
    ceramics. (Unless you have tested the ceramic and found it bad.)
     
  4. runcorn_rat

    runcorn_rat Guest

    hi there Chaps
    thanks for the quick reply

    more information , on furhter inspections, the silk screen printing
    always shows a symbol for a capacitor where a cap goes , but
    where this component goes it just shows 5 tiny squares
    although it looks like a ceramic cap .. it now seems it may not be .

    and the reason i suspect its gone, it there was a large crack
    across the width of it , and when touched half of it fell off.

    the faulty component is located near the front right hand side of the board
    ,
    looking from the back and is very close to the on-board fuse.and very close
    to a red connector and one leg of this faulty component appears to connect
    to the deguasuing coil around the tube,

    hope this explained a bit more ..

    Oh yes ps i have changed a majority of the electrolytics on the PSU..

    de Paul
     
  5. runcorn_rat

    runcorn_rat Guest

    hi there Chaps
    thanks for the quick reply

    more information , on furhter inspections, the silk screen printing
    always shows a symbol for a capacitor where a cap goes , but
    where this component goes it just shows 5 tiny squares
    although it looks like a ceramic cap .. it now seems it may not be .
    a picture of the faulty component can be seen on the following link

    http://www.freewebs.com/ukhamman/faulty1.jpg

    and the reason i suspect its gone, it there was a large crack
    across the width of it , and when touched half of it fell off.

    the faulty component is located near the front right hand side of the board
    looking from the back and is very close to the on-board fuse.and very close
    to a red connector and one leg of this faulty component appears to connect
    to the deguasuing coil around the tube,

    hope this explained a bit more ..
    Oh yes ps i have changed a majority of the electrolytics on the PSU..

    de Paul
     
  6. runcorn_rat

    runcorn_rat Guest

    hi there Chaps
    thanks for the quick reply

    more information , on furhter inspections, the silk screen printing
    always shows a symbol for a capacitor where a cap goes , but
    where this component goes it just shows 5 tiny squares
    although it looks like a ceramic cap .. it now seems it may not be .
    a picture of the faulty component can be seen on the following link

    http://www.freewebs.com/ukhamman/faulty1.jpg

    and the reason i suspect its gone, it there was a large crack
    across the width of it , and when touched half of it fell off.

    the faulty component is located near the front right hand side of the board
    looking from the back and is very close to the on-board fuse.and very close
    to a red connector and one leg of this faulty component appears to connect
    to the deguasuing coil around the tube,

    hope this explained a bit more ..
    Oh yes ps i have changed a majority of the electrolytics on the PSU..

    de Paul
     
  7. Guest

    its probably a thermistor. 9R0 means 9 ohms. But if its part of the
    degauss cct it will usually have no noticeable effect on operation.


    NT
     
  8. James Sweet

    James Sweet Guest


    Could be to reduce the inrush current, in which case the set will be
    dead if it fails.
     
  9. Ross Herbert

    Ross Herbert Guest

    Since the location of the device is in the front end of the mains
    input supply portion of the circuit this component is a NTC inrush
    current limiter, probably a nominal 9 ohms resistance at 25C.

    Typical info here http://www.ametherm.com/Inrush_Current/welcome.html
     
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