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sliver
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Last Activity: 10-05-2011, 12:55 AM
Joined: 09-12-2010
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  • sliver
    started a topic 12v DC - 240v AC Inverter / Battery charger failure
    in Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals

    12v DC - 240v AC Inverter / Battery charger failure

    [B]12v DC - 240v AC Inverter / Battery charger failure[/B]

    The device currently works only as a battery charger, taking in 240v AC and outputting enough to charge a 12v DC battery. 3000 watt capacity.

    Reading the AC output in inverter mode with no load attached showed very small voltage fluctuating below 1 volt.

    I am thinking it might be capacitor related.
    [LIST][*]- The device makes a pulsing beep when in inverter mode[*]- Fuses look fine[*]- Fans (all 12v) functioning fine[*]- Some white gooo on one of the coil things[/LIST]

    ...
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  • sliver
    replied to ViewSonic VA903b
    in Troubleshooting Computer Displays
    Re: ViewSonic VA903b

    Thanks for all your help people. My caps arrived today and I attacked the board with a soldering iron and now my monitor works like a charm.
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  • sliver
    replied to ViewSonic VA903b
    in Troubleshooting Computer Displays
    Re: ViewSonic VA903b

    Thanks all for help. I have worked out what I need:

    2 x 470uf @ 25v
    1 x 470uf @ 10v
    2 x 1000uf @ 10v

    I have been using the site [url]http://nz.farnell.com[/url] to locate panasonic type as recommended above. My question now is if I should be getting ones where voltages is rated as DC or AC. This is for use in the back of the LCD monitor....

    Thanks again.Re: ViewSonic VA903b<br /> <br /> ...> 2 x 1000uf @
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  • sliver
    replied to ViewSonic VA903b
    in Troubleshooting Computer Displays
    Re: ViewSonic VA903b

    This company has shops locally. Does this catalogue list the appropriate types:

    [url]http://jaycar.co.nz/productResults.asp?CATID=51&SUBCATID=860&keyform=CAT[/url]

    cheers!Re: ViewSonic VA903b<br /> <br /> ...<br /> cheers!Re: ViewSonic VA903b

    This company has shops locally. Does this catalogue list the appropriate types:
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  • sliver
    replied to ViewSonic VA903b
    in Troubleshooting Computer Displays
    Re: ViewSonic VA903b

    Thanks for all your advice.

    How do I know what size / type of capacitors to get as replacements?

    I will try and find a local (NZ based) outlet / website to get replacements. Is there anything I can do to try and prevent this from happening again?

    Thanks again.
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  • sliver
    replied to ViewSonic VA903b
    in Troubleshooting Computer Displays
    Re: ViewSonic VA903b

    I have opened up my Viewsonic VA903b and am looking at the capacitors

    You say they can 'bulge'... what does this mean exactly?... bulged on the sides or end?

    When I turn on the monitor it makes a whining sound,shows the picture while whining then clicks off/goes to standby. If I turn it on and off several times eventually it stays on... Does this sound like a capacitor issue?

    I have attached a photo showing the extent of the end bulging on my capacitors. Any advice appreciated....
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