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Why does Lenovo G505S does not power up on AC supply


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#1 Rocmail520

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Posted 03 July 2016 - 06:13 AM

Why does Lenovo G505S does not power up on AC supply?
why it is dependent on battery ?
or how do I confirm that AC adapter is faulty or charging point is faulty if I do not have any other Lenovo product ?

Edited by Queen-Evie, 03 July 2016 - 08:22 AM.
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#2 FreeBooter

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Posted 05 July 2016 - 07:56 AM

Only true way to found out if the AC power adapter is supplying the Voltage that is needed by your laptop is to use a Multimeter.


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#3 Chris Cosgrove

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Posted 05 July 2016 - 07:49 PM

Most laptop chargers ouptut 18.5 to 19.5V and usually with a current rating of 4 - 5A, sometimes a little less depending on the model. If you merely connect a meter across the end of the lead that plugs into the laptop you are testing it 'off-load'  and it really needs to be tested under at least some load. I have known faulty power supplies show apparently normal outputs into the relatively high impedance of a, paricularly digital, meter and drop to virtually nothing under load.

 

I have some very old wire wound resistors, they came out of totally obsolete TVs, which I use for this but a couple of car light bulbs connected in series would provide at least some load. It would be more informative to put at least some load on the charger unit.

 

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#4 FreeBooter

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Posted 05 July 2016 - 09:07 PM

Laptop AC power adapter voltage can be tested with multimeter.

 

 

Test Laptop AC Power Adapter with Multimeter by Britec

https://youtu.be/LnTxs0o5CJA


Edited by FreeBooter, 05 July 2016 - 09:08 PM.

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#5 DavisMcCarn

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Posted 06 July 2016 - 07:25 AM

AC adapters are pretty cheap, these days; but, be sure to include "genuine Lenovo" in your search:
($15.44) http://www.ebay.com/itm/Original-IBM-Lenovo-AC-Adapter-42T4416-20V-3-25A-65W-42T4417/152070161184?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20131003132420%26meid%3Da805abf5e34e4372b7a35fd7e7d63e8f%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D151997345655
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#6 Rocmail520

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Posted 07 July 2016 - 08:35 AM


The charger and charging port are fine and working.

my concern is why does it need battery to power up ? Why can't it just power up on direct supply ?

i did ordered a new battery but what is it that stops it from booting up on direct supply?

#7 DavisMcCarn

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Posted 07 July 2016 - 09:44 AM

I ran into a few threads with very similar problems and it turned out it was the system board (most people call them motherboards; but, they're not).  It is definitely a power management problem (period).

If you don't have BIOS 3.0 (2014), you might try that; but, if it doesn't fix it, its the system board.

http://support.lenovo.com/us/en/products/laptops-and-netbooks/lenovo-g-series-laptops/lenovo-g505s-notebook/downloads/DS038577


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#8 Rocmail520

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Posted 09 July 2016 - 08:00 AM

Thanks for your support.

Now the situation has become more worse.

New battery worked for a while but now when plugged in charging it does not charge nor the system boots up.

the only thing I see is orange flashing light on the battery indicator when I press Power up right after plugging the charger or if I wait for a minute or two then if I Power up then it shows orange flashing light on the battery indicator along with white flashing light on direct suppy indicator and they keeps flashing till only orange light continues .

Does this signifies that power supply has an issue ? I feel so
You already right fully said its power management issue. I ll have it checked then.
If you have any more suggestion then I look forward to it.
Thanks

#9 DavisMcCarn

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Posted 09 July 2016 - 01:12 PM

Usually, a blinking orange means it thinks the battery has failed. Put the old battery back in and try that.
Is the new one a genuine Lenovo or somebody elses knockoff?
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