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wrong ac adapter for asus g73jh?

Discussion in 'General Hardware' started by speedy11131, Jun 17, 2011.

  1. speedy11131 New Member

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    Recently I bought a replacement AC adapter on ebay, but it seems to be having an issue. If I plug it in with the battery, computer keeps switching between AC mode and battery mode every 10 - 15 seconds. If the battery is taken out and just the charger is plugged in, the machine turns on for a second, then shuts off.

    The rating for the G73 is 19.5V and 7.7A
    The rating for the AC adapter is 19V and 6.3A.

    So why is it not working when plugged in? I have it plugged in but the computer off, and the indicator light for charging the battery is lit. Not flashing or anything, just as if I was using the factory AC adapter.
    I'm going away on a trip and even though the charger that came with the laptop works, the adapter connector part was frayed and then mended. No issues with it, just that its bent.

    So I may be either stuck getting a universal charger or if any local stores have them.

    Edit: don't have time to order another one as I'm leaving the country tomorrow. :(
  2. micropage7

    micropage7

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    6,3 ampere for 7,7 ampere?
    of course your battery would hard to charge
    so thats why it aint work. it gives power lower than it needs
  3. Bo$$

    Bo$$ Lab Extraordinaire

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    not enough ampere mate...
  4. whitrzac New Member

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    don't buy cheap power bricks from fleebay...
  5. newtekie1

    newtekie1 Semi-Retired Folder

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    As others have said, a 6.3A charger won't work properly with a laptop that draws more than that.

    What is likely happening is that the power brick's OCP is kicking in and cutting power to the laptop when the laptop is running. That is why it is switching back and forth from AC to battery power. When the OCP kicks in, the power brick turns off, and the laptop switches to battery power. Then the OCP resets, turns the brick back on, and the laptop switches to AC power again. Rince, repeat. You can't turn it on without the battery because the OCP kicks in right away and the power brick turns off.

    Of course, when it is just sitting there charging it isn't using as much power as when the laptop is actually turned on and in use, so charging with the power brick doesn't trigger the OCP.

    The voltage different isn't likely going to cause an issue, 0.5v DC into the laptop difference isn't going to really matter.

    But basically the original power brick was rated for 150w, the new one is only 120w. It is just like putting a power supply in a dekstop computer that is too small, the OCP will kick in and shut down the PSU, turning off the computer. But in your case, with a laptop, when the PSU shuts down the battery kicks in and the laptop stays running.
    Crunching for Team TPU 50 Million points folded for TPU
  6. xBruce88x

    xBruce88x

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    yea not enough power to keep the laptop running and charging the battery at the same time. you may get away with charging the battery while the unit is off but that's it.
  7. user21

    user21 New Member

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    the charger aint right for your hardware specified
  8. Jetster

    Jetster

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    Check your A/C plug is it loose? They do break you know if you drop them with the plug in. I have bought many cheep chargers and never had a problem

    Why did you buy a new one.
  9. xBruce88x

    xBruce88x

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    its not that the plug is loose, the adapter just can't power the laptop. the laptop calls for about 150watts (7.7A x 19.5v) but the adapter can only provide about 120w (6.3A x 19v). 30watts in a laptop makes a big difference.
  10. werez

    werez New Member

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    not enough amps to run ur laptop and charge the bat. at the same time . But in theory it should have enough power to keep your laptop running ( without the bat. in ) , because that value is the absolute maximum power consumption , and you basically don`t get near that . That would be having all the usb`s drawing power , burning a dvd or whatever , stressing the cpu / vpu to the max , full brightness @ LCD , using the cardreader(s) , bluetooth on , wireless on , and charging that battery , all at the same time . There might be something wrong with the adapter if you ask me . I don`t think the adapter is stable @ high power consumption , and tbh you should stop using it . You might damage ur lappy ( charging chip / i`ve seen it happen ) and prolly u don`t want that ...

    I`m using an Acer that req. 7.1A / 19.1V , on a 6A adapter . It works just fine , and also the bat gets juice . It`s a DELTA adapter ( pretty good stuff ) . The same adapter works on a DELL that also req. 7.1A . Yours might be rated for 120 or so , but i doubt it can provide ...
    Last edited: Jun 18, 2011

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