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CRT - Charge

Discussion in 'The Lounge - Off Topic' started by UCHEEKYMONKEY, Jun 12, 2006.

  1. UCHEEKYMONKEY
    Honorary Member

    UCHEEKYMONKEY R.I.P - gone but never forgotten. Gold Member

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    Does anybody know how much charge a VDU monitor contains after it is disconnected from the mains?

    My neighbour wants me to have a look at it, to find out why it's always flickering. I'm not sure about poking around the back of CRT's?

    I was told they hold a certain amount of charge like TV's do?

    Any idea's?

    Monkey 8)
     
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  2. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    They are exactly like TVs. The EHT is around 25kV, and a substantial amount of this remains a surprising time after switch-off. As an ex-TV engineer I would *strongly* suggest that if you don't know in detail about such things *DON'T TAKE THE BACK OFF ONE*! :biggrin

    Sorry to shout at you Monkey, but I like your style and wouldn't want to see you disappear in such tragic fashion.

    Harry.
     
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  3. AJ

    AJ Administrator Administrator

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    I've just asked my boss who used to work on this type of stuff and he said that if it is a colour CRT then the 28000 volts should discharge within a matter of mins but if it a mono screen it can take a couple of hours. Saying that, he also said that even after the discharge time, there may be a few capacitors that will "make your hair stand on end".

    Always better to get the monitor down to a specialist or if it's not under guarantee, buy a new CRT, they are really cheap now.

    Edit: Harry beat me to it again !!!
     
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  4. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    Incidentaly - most cases of flickering I've seen were due to a dodgy VGA lead - this gets lots of flexing and faults develop there usualy.

    Harry.
     
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  5. UCHEEKYMONKEY
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    UCHEEKYMONKEY R.I.P - gone but never forgotten. Gold Member

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    Thanks Harry and AJ

    I didn't feel like getting a new spikey hair style just yet!

    The monitor is an old 17" CRT by Time computers. I'm not sure if this company still exist? I have just changed the leads over and yes as Harry states it's a dodgy lead.

    But...the screen still turns pink after about 10 minutes?

    Hmmm I wonder if it's worth sending to a specialist to repair or buy a revamped VGA?

    Monkey 8)
     
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  6. Mr.Cheeks

    Mr.Cheeks 1st ever Gold Member! Gold Member

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    wouldn't it be better just getting a new monitor?
     
  7. UCHEEKYMONKEY
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    UCHEEKYMONKEY R.I.P - gone but never forgotten. Gold Member

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    It would be, however some people can't afford it Cheek.
    They rather go the cheap and chearful way than spend some dosh on quality gear :rolleyes:

    Beats me?? :(
    I've had my Technics Hifi for almost 9 years now. I've never had any problems yet my neighbour has gone through loads of cheap Hifi's such as Alba or saisho. He just doesn't learn. If it's got flashing LED's on it and cost £50 he will buy it!

    Monkey :rolleyes:
     
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  8. Mr.Cheeks

    Mr.Cheeks 1st ever Gold Member! Gold Member

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    he's one of them dudes... have you told him the pros of having a newer one?

    edit: hhere
     
  9. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    The repair charge will be higher than buying a refurb screen. At the fairs these are going for about £20 these days.

    Harry.
     
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  10. UCHEEKYMONKEY
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    UCHEEKYMONKEY R.I.P - gone but never forgotten. Gold Member

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    Cheers Mate :thumbleft
     
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  11. UCHEEKYMONKEY
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    UCHEEKYMONKEY R.I.P - gone but never forgotten. Gold Member

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    What would be the point? He doesn't even wear proper trousers :ohmy
     
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  12. UCHEEKYMONKEY
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    UCHEEKYMONKEY R.I.P - gone but never forgotten. Gold Member

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    What about apple macs?

    Aren't they CRT?

    Also don't they have the MB and bits inside the VDU casing?

    What if I was to wear some rubber gloves?
    I mean besides getting a little excited wouldn't this stop the charge going through my body?

    Then again it's an old Monitor :hhhmmm
     
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  13. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    I wouldn't risk it. There are other voltages inside a CRT - but the components don't go round waving screwdrivers and hands about, so their placing keeps them safe. :biggrin

    Harry.
     
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  14. UCHEEKYMONKEY
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    UCHEEKYMONKEY R.I.P - gone but never forgotten. Gold Member

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    Ok Harry enough said I will my neighbour to buy another and if he argues I will tell him to shove it!

    Monkey
     
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