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View Full Version : How to Replace G751JY AC Power Jack Port ?



ufotheswe
10-25-2017, 01:31 AM
So. After too many hours troubleshooting, a new battery and some tears I believe I have found the culprit of my problems. The AC IN Jack. Today my G751JY-T7373H didnt recognize the AC charger anymore, so I have no choice but to fix it. I took the laptop appart to see if I could see any clear damage to the ac jack, but it looked brand new, but it still doesnt work.

So I was wondering if anybody here have any experience with replacing the ac jack themselves. I wonder about:

1. Do I need to buy the mini-board? Like this. (https://www.ebay.com/itm/NEW-DC-IN-Power-Jack-Board-Asus-G750JW-BBI7N05-G751J-G751JT-DH72-G751JL-G751JM/252315953362?rt=nc&_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%2 6asc%3D49009%26meid%3Dfd4a6b439e5f4a48898817b20249 d737%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D3024 48823556&_trksid=p2047675.c100005.m1851). Or is it enough to buy just the actual port? Like this. (https://www.ebay.com/itm/AC-DC-Power-Jack-Socket-Port-FOR-Asus-G751JY-G751JY-DH71-G751JT-DH72-G751JT-CH71/282005588133?hash=item41a8d7c8a5:g:EAYAAOxyNo9Ss8L t)
2. How do I know what of the models I need? There are so many and I dont wanna waste more time getting the wrong model.

Regards a sad ROG owner.

Clintlgm
10-25-2017, 02:47 AM
I think I would get the card, the price is right and the port is already connected and secured, looks like a drop in part? I'm not sure that the card will have the actual charging modular built into it or it that is another part on the Motherboard.
It looks to me that the socket only would take some work to get is totally stabilized on the card unless its a solder on?

ufotheswe
10-25-2017, 01:24 PM
I think I would get the card, the price is right and the port is already connected and secured, looks like a drop in part? I'm not sure that the card will have the actual charging modular built into it or it that is another part on the Motherboard.
It looks to me that the socket only would take some work to get is totally stabilized on the card unless its a solder on?]\\

Thanks for your reply. Yeah its easy to insert the card, its a drop in part, if I understand the terminology correctly. I really dont know if its a solder on or not.

I tested the AC charger, and its working perfectly. So it has to be the AC jac in. I just got to find out what model to buy.

Thanks again.

Korth
10-25-2017, 02:17 PM
You can use a DMM to test electrical properties of the jack itself, the charging PCB, the AC adapter, the battery, the wires in between them all. The jack is the last thing you want to replace unless you really like doing solder rework, while the other pieces/modules each cost money to replace.

I wouldn't order any replacement parts (or do any soldering) until I knew exactly which part has failed.

ufotheswe
10-25-2017, 02:25 PM
You can use a DMM to test electrical properties of the jack itself, the charging PCB, the AC adapter, the battery, the wires in between them all. The jack is the last thing you want to replace unless you really like doing solder rework, while the other pieces/modules each cost money to replace.

I wouldn't order any replacement parts (or do any soldering) until I knew exactly which part has failed.


Thanks alot Korth, i really appreciate your answer. How would I test the jack in with a DMM? How can I see if its working or not?

I think if I buy the miniboard with the jack in it doesnt require any soldering?

Regards

Edit: Here is the part that is broken: https://imgur.com/a/3Nuf3

Clintlgm
10-25-2017, 05:54 PM
Your link looked good to me, there is asus part dealer in EU Goggle them up they might be helpful.
your probably correct that its the AC socket there have been many failures here in the ROG forums. Still there is a Charging circuit on the motherboard that could be the problem also. Just something to think of.

Korth
10-25-2017, 10:18 PM
How would I test the jack in with a DMM? How can I see if its working or not?

I think if I buy the miniboard with the jack in it doesnt require any soldering?

Edit: Here is the part that is broken: https://imgur.com/a/3Nuf3
That's an easy part (board) to test, especially if you have it out of circuit (removed from the laptop).

Just put the DMM in resistance/continuity test mode and see if the electrical circuit actually works between the input side (where you plug the jack in) and the output side (where it's soldered to PCB), for both power and ground pins. If the part isn't conducting then it's a dead part.

Put the DMM in DCV test mode and measure if your AC adapter is outputting DC voltage (at the jack). If no DC power then the adapter (or wires or wall receptacle) is dead.
If the adapter/etc works then measure if the output side on the PCB part is receiving voltage when plugged into the AC adapter. If no DC power then the PCB part is dead.

The whole point of using a test instrument is to figure out where an electrical source you know is good (at the AC wall receptacle) is interrupted before it can power the laptop. So you know which part has failed and needs repair/replacement.

Darnassus
10-26-2017, 04:50 AM
I'd get the whole module.. saves you the soldering job.

Just make sure its sex is correct.. back with the G750's you could get models that have internal male. (Ones with a pin inside of the laptop) And internal female. (Pin inside the charging cord)

Cheetah
10-27-2017, 11:09 PM
I'd get the whole module.. saves you the soldering job.

Just make sure its sex is correct.. back with the G750's you could get models that have internal male. (Ones with a pin inside of the laptop) And internal female. (Pin inside the charging cord)

I saw that too.

The power cord of the G751JT have a centre pin inside. Those EBay jacks are all wrong!

agmvc5
11-20-2018, 02:51 PM
Hello, I have the same problem. Finally, how did you fix it? Ive been looking but i dont find the on board model for the G750JY.

agmvc5
11-28-2018, 03:11 PM
Hello again.

Finally I was able to fix it, looking and asking i found this replacement in Ebay "NEW DC POWER JACK BOARD FOR ASUS G750 G750JZ-XS72 G750JZ-17FA G750JZ-QB71" the seller is named EXCELI INFORMATIQUE.

I could install it by myself. My laptop model is G750JY, but when I disassembled it, the DC IN board was labeled G750JZ, so the new one is 100% compatible. Thanks also to youtube https://www.youtube.com/watch?v=UBoqntue4Kk full tutorial for disassembling. Ebay seller is based in France so it only took 5 five days to deliver to Spain by normal post.

I hope this helps to other with the same problem.

Thanks,

Darnassus
11-29-2018, 05:00 AM
Well done. ;x