LCD Build quality

Discussion in 'NZ Computing' started by PeeCee, Oct 7, 2009.

  1. PeeCee

    PeeCee Guest

    CMV 948A 19" LCD

    18 - 24 months old, no backlight.

    Dismantled it to check things over.

    Well I never, the signal and power boards are held on the back of the LCD
    with 'sticky tape'

    All the other ones I ever pulled apart have had some sort of bracket &
    screws, but this one was just taped there.

    Ah well they do say you get's what you pay for.

    (was worth the effort though, the LCD was a cast off and all that was wrong
    was two blown electrolytic caps, yer gotta win the occasional one)

    P.
     
    PeeCee, Oct 7, 2009
    #1
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  2. PeeCee

    Mary Hanna Guest

    On Thu, 8 Oct 2009 00:22:19 +1300, "PeeCee" <> wrote:

    >CMV 948A 19" LCD
    >
    >18 - 24 months old, no backlight.
    >
    >Dismantled it to check things over.
    >
    >Well I never, the signal and power boards are held on the back of the LCD
    >with 'sticky tape'
    >
    >All the other ones I ever pulled apart have had some sort of bracket &
    >screws, but this one was just taped there.
    >
    >Ah well they do say you get's what you pay for.
    >
    >(was worth the effort though, the LCD was a cast off and all that was wrong
    >was two blown electrolytic caps, yer gotta win the occasional one)
    >
    >P.



    Its well known that CMV is a crap brand..
     
    Mary Hanna, Oct 7, 2009
    #2
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  3. PeeCee

    ~misfit~ Guest

    Somewhere on teh intarwebs PeeCee wrote:
    > CMV 948A 19" LCD
    >
    > 18 - 24 months old, no backlight.
    >
    > Dismantled it to check things over.
    >
    > Well I never, the signal and power boards are held on the back of the
    > LCD with 'sticky tape'
    >
    > All the other ones I ever pulled apart have had some sort of bracket &
    > screws, but this one was just taped there.
    >
    > Ah well they do say you get's what you pay for.
    >
    > (was worth the effort though, the LCD was a cast off and all that was
    > wrong was two blown electrolytic caps, yer gotta win the occasional
    > one)


    Well done. :)


    I read somewhere that fully 50% of 'failed' LCDs, especially the cheaper
    ones, can be fixed by replacing capacitors.

    I have a couple 15" XGA HP 1502s for spares/testing and when I Googled them
    I found repeated mention of which capacitors to replace when they go wrong,
    and that often the caps look fine but still, replaceing them usually brings
    it back to life.

    Cheers,
    --
    Shaun.

    "Give a man a fire and he's warm for the day. But set fire to him and he's
    warm for the rest of his life." Terry Pratchet, 'Jingo'.
     
    ~misfit~, Oct 7, 2009
    #3
  4. PeeCee

    PeeCee Guest

    "~misfit~" <> wrote in message
    news:haj6d8$do5$-september.org...
    > Somewhere on teh intarwebs PeeCee wrote:
    >> CMV 948A 19" LCD
    >>
    >> 18 - 24 months old, no backlight.
    >>
    >> Dismantled it to check things over.
    >>
    >> Well I never, the signal and power boards are held on the back of the
    >> LCD with 'sticky tape'
    >>
    >> All the other ones I ever pulled apart have had some sort of bracket &
    >> screws, but this one was just taped there.
    >>
    >> Ah well they do say you get's what you pay for.
    >>
    >> (was worth the effort though, the LCD was a cast off and all that was
    >> wrong was two blown electrolytic caps, yer gotta win the occasional
    >> one)

    >
    > Well done. :)
    >
    >
    > I read somewhere that fully 50% of 'failed' LCDs, especially the cheaper
    > ones, can be fixed by replacing capacitors.
    >
    > I have a couple 15" XGA HP 1502s for spares/testing and when I Googled
    > them I found repeated mention of which capacitors to replace when they go
    > wrong, and that often the caps look fine but still, replaceing them
    > usually brings it back to life.
    >
    > Cheers,
    > --
    > Shaun.
    >
    > "Give a man a fire and he's warm for the day. But set fire to him and he's
    > warm for the rest of his life." Terry Pratchet, 'Jingo'.
    >



    Hi Shaun

    Actually it was the second CMV (17") I've fixed in the last couple of days
    with exactly the same capacitor problem.
    Both cases they were in the power supply & were obviously blown.
    As for the 19" the 17" was also a cast off, so double win.

    Didn't fare so well with a Philips 150B 15", the 2SK2645 power supply
    switching FET was shorted.
    I don't know if it's worth the $25 for a new FET in case there are other
    latent faults that blow the replacement.
    For example Trademe shows one for $55 in working order!

    ....

    Found this schematic: http://pdf.dzsc.net.cn/88888/2008118105925756.pdf
    The power supply section looks suspiciously like the Philips, maybe I could
    cut out the 230V bit and just drive it with an external 12v brick, mmmm.

    Best
    Paul.
     
    PeeCee, Oct 8, 2009
    #4
  5. PeeCee

    Carnations Guest

    On Thu, 08 Oct 2009 10:28:11 +1300, Mary Hanna wrote:

    > Its well known that CMV is a crap brand..


    Woger, it is a sticky-tape brand. ;o)


    --
    "Filtering the Internet is like trying to boil the ocean"
     
    Carnations, Oct 8, 2009
    #5
  6. PeeCee

    ~misfit~ Guest

    Somewhere on teh intarwebs PeeCee wrote:
    > "~misfit~" <> wrote in message
    > news:haj6d8$do5$-september.org...
    >> Somewhere on teh intarwebs PeeCee wrote:
    >>> CMV 948A 19" LCD
    >>>
    >>> 18 - 24 months old, no backlight.
    >>>
    >>> Dismantled it to check things over.
    >>>
    >>> Well I never, the signal and power boards are held on the back of
    >>> the LCD with 'sticky tape'
    >>>
    >>> All the other ones I ever pulled apart have had some sort of
    >>> bracket & screws, but this one was just taped there.
    >>>
    >>> Ah well they do say you get's what you pay for.
    >>>
    >>> (was worth the effort though, the LCD was a cast off and all that
    >>> was wrong was two blown electrolytic caps, yer gotta win the
    >>> occasional one)

    >>
    >> Well done. :)
    >>
    >>
    >> I read somewhere that fully 50% of 'failed' LCDs, especially the
    >> cheaper ones, can be fixed by replacing capacitors.
    >>
    >> I have a couple 15" XGA HP 1502s for spares/testing and when I
    >> Googled them I found repeated mention of which capacitors to replace
    >> when they go wrong, and that often the caps look fine but still,
    >> replaceing them usually brings it back to life.
    >>

    > Hi Shaun
    >
    > Actually it was the second CMV (17") I've fixed in the last couple of
    > days with exactly the same capacitor problem.
    > Both cases they were in the power supply & were obviously blown.
    > As for the 19" the 17" was also a cast off, so double win.


    Yes, I should have mentioned that. It's invariably the LCDs with an integral
    PS that have capacitor problems IME.

    > Didn't fare so well with a Philips 150B 15", the 2SK2645 power supply
    > switching FET was shorted.
    > I don't know if it's worth the $25 for a new FET in case there are
    > other latent faults that blow the replacement.
    > For example Trademe shows one for $55 in working order!


    Yeah, comes a time when it's just not economical to fix a unit unless you
    have one to canabilise. Then again, as you say, something else may have
    caused the FET to blow.

    > Found this schematic:
    > http://pdf.dzsc.net.cn/88888/2008118105925756.pdf The power supply
    > section looks suspiciously like the Philips, maybe I could cut out
    > the 230V bit and just drive it with an external 12v brick, mmmm.


    Hehee! Sounds like something I would do. ;-)

    Cheers,

    Shaun.
     
    ~misfit~, Oct 9, 2009
    #6
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