PDA

View Full Version : G751JY Battery Jack charging issues



Furmentor
04-13-2017, 04:12 PM
I have a G751JY that is a bit over a year old. 2 months ago I would lose charging while playing games. I initially thought it was the charger and bought a new one. Plugged it in and it started charging again. Last night it stopped charging while plugged in. I disassembled everything and got to the DC charging port out. I looked it over with a electrical engineer coworker who specializes in finding hardware issues. He didn't see any visible issues, but did it may be an internal connection. He also mentioned there have been cases of drivers causing charging issues. Before I buy another DC port, does anyone have other ideas as a cause?

Other notes. When I lose charging, I used to be able to move my cord/plug around and get it to connect. Now without moving it, it will randomly charge or stop charging. This is why I initially thought it was the charger.

cl-Albert
04-13-2017, 05:04 PM
Welcome to the forums!

I'm perplexed by it and not sure what is causing it, so feel free to ignore or disregard anything below if necessary since it may be incorrect.


If somebody hasn't already, make sure the replacement adapter specs matches the label under your notebook which should be something like 19.5V, 11.8A, for 230W. Sounds a little unusual, but if the replacement adapter did solve the problem at first, wish there was an easy way to check it on another system or try another charger just to make sure that one didn't happen to go bad too (what are the chances?).
Assuming the charger is okay, seems unusual to me that there would be any problem with the DC jack if you don't see anything loose or wrong on your end, but I don't work in repair and have much experience with it either.
Not sure if it's worth the trouble or what it would tell us, but I believe the unit should run fine on AC power without the battery (again haven't tried it myself), so you might try removing the battery and maybe booting into the bios so it doesn't cause any problems with Windows or your hard drive if it unexpectedly powers off (might want to remove your hard drive too?) just to see if you can get it to power off by wiggling the jack, etc. and confirm there is really some problem with it or not.
If everything is fine without the battery, it may not be easy to check without a spare battery, but wondering if there could be a battery issue although don't think I've ever run across a battery that just charges intermittently (I don't work in repair either though)
So if it's not the adapter, the DC jack, or the battery, wonder if there could be something with the motherboard battery charging circuitry, but not easy to check without another motherboard, so you may just need to check what you can before getting to this point.
Also, if you didn't already know, the system doesn't always charge the battery when the charge is above 95%, so just want to confirm the battery charging issues are below 95% charge.


Feel free to discuss or request more suggestions from others and good luck!

Furmentor
04-13-2017, 06:05 PM
Welcome to the forums!

I'm perplexed by it and not sure what is causing it, so feel free to ignore or disregard anything below if necessary since it may be incorrect.


If somebody hasn't already, make sure the replacement adapter specs matches the label under your notebook which should be something like 19.5V, 11.8A, for 230W. Sounds a little unusual, but if the replacement adapter did solve the problem at first, wish there was an easy way to check it on another system or try another charger just to make sure that one didn't happen to go bad too (what are the chances?).
Assuming the charger is okay, seems unusual to me that there would be any problem with the DC jack if you don't see anything loose or wrong on your end, but I don't work in repair and have much experience with it either.
Not sure if it's worth the trouble or what it would tell us, but I believe the unit should run fine on AC power without the battery (again haven't tried it myself), so you might try removing the battery and maybe booting into the bios so it doesn't cause any problems with Windows or your hard drive if it unexpectedly powers off (might want to remove your hard drive too?) just to see if you can get it to power off by wiggling the jack, etc. and confirm there is really some problem with it or not.
If everything is fine without the battery, it may not be easy to check without a spare battery, but wondering if there could be a battery issue although don't think I've ever run across a battery that just charges intermittently (I don't work in repair either though)
So if it's not the adapter, the DC jack, or the battery, wonder if there could be something with the motherboard battery charging circuitry, but not easy to check without another motherboard, so you may just need to check what you can before getting to this point.
Also, if you didn't already know, the system doesn't always charge the battery when the charge is above 95%, so just want to confirm the battery charging issues are below 95% charge.


Feel free to discuss or request more suggestions from others and good luck!

Thanks for the reply.

Yes, the new power supply matches the original.

Removing the battery on this thing is quite the chore (need to remove MB), but since it is currently disassembled, I could reassemble it without the battery and see what happens.

If the motherboard circuitry is going bad...well that is a problem. Is that something I would need to send to Asus? I don't think a general computer repair shop could handle that.

In response to the 95% charge issue, charging is intermittent. It's drained the battery and would not charge. come back the next day. plug it in and it charges again. That being said, I only really use this computer when it is plugged in since it is really only for gaming. When it is unplugged I only get about half the performance.

cl-Albert
04-13-2017, 08:44 PM
Removing the battery on this thing is quite the chore (need to remove MB), but since it is currently disassembled, I could reassemble it without the battery and see
what happens.

Yes, up to you and just make sure you're comfortable doing this and don't get into more trouble disassembling the unit trying to remove the battery. If the unit does work without the battery and helps you to confirm if there is a problem with the DC jack though, may be worth the trouble or risk.



If the motherboard circuitry is going bad...well that is a problem. Is that something I would need to send to Asus? I don't think a general computer repair shop could handle that.

You want to check around and discuss with more people since I work for ASUS and will be a bit biased, but you can always send it back to ASUS for repair to figure out and solve if you want. ASUS support can also confirm your warranty status if you're not sure (1 year or 2 year?) and provide a guesstimate for the cost of a motherboard replacement when you're ready just to give you an idea. Out of warranty repairs include a only a limited warranty if you want to ask about that as well.
Depending on where you are located, we have very few authorized service centers in the U.S., but something else to check with ASUS support about or check on the website (if the information is available?).
Not sure what other repair shops out there can do, so you will need to check that out on your own, but hopefully you can solve it before getting to this point since it is probably too early to conclude it is a motherboard problem although something to keep in mind.



In response to the 95% charge issue, charging is intermittent. It's drained the battery and would not charge. come back the next day. plug it in and it charges again. That being said, I only really use this computer when it is plugged in since it is really only for gaming. When it is unplugged I only get about half the performance.

It's possible the problem might still be with the AC adapter if replacing it solved the problem last time and there is any doubt or questions about the quality or function of the AC adapter you have currently.

If an AC adapter with smaller wattage is used by mistake, I've seen where the AC adapter will just 'quit' and stop charging eventually, but unplugging the AC adapter from both the notebook and wall and letting it 'rest' for a short period will get it working again until it is plugged back in and stops working again.

If your adapter is the correct wattage, but just defective (or something in your notebook is drawing more power than normal?), it may be doing something like this as well, so another idea is to just unplug your adapter from the notebook and wall everytime it stops charging to let it 'rest' and plug it back later to see if it could be this issue.
Without an extra adapter available to test though it is possible the problem is on the motherboard side and not the adapter side though, but if replacing the AC adapter last time solve the issue, it just might be a problem again with this new AC adapter (especially if there are any questions about the quality)?
If you happen to have any warranty left for the new AC adapter, consider looking into getting a replacement.

If you don't have any good options and the problem isn't too serious yet, wondering if you may just want to live with it and save up for a new system if you have any plans in the near future to upgrade your system. Just be careful not to make the problem worse and that you're okay with the risks whatever you try.

Keeping the battery charged at 100% and the AC adapter plugged in whenever you turn on the notebook should minimize the stress on your AC adapter (and motherboard charging circuits?) if you want to try to work around it. If the unit appears to run fine or better without the battery, that may be another idea assuming you don't care about using the battery.

tule193
04-14-2017, 02:28 AM
Hi,

It seems your problem is very similar to mine @ https://rog.asus.com/forum/showthread.php?92529-Run-G751-completely-without-battery.

Are you able to run it without the battery?