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Laptop turn off when battery is inserted while using AC

475 Views 9 Replies 6 Participants Last post by Couriant, Mar 6, 2022

vLadJerome

Discussion Starter · Mar 5, 2022

Hi ,

My laptop(Dell G7 7790) turns off when windows logo when battery inserted. (battery not charging) Battery ligt white flashing every 2-3 seconds. If I use without battery, laptop performance is very low. I already tried 130w ,180w, and 240w chargers.(Same problem). I tried brand new battery and pc port. This doesn't work for me. What should i do ???

Thanks

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Digerati

· #2 · Mar 5, 2022

vLadJerome said:
I tried brand new battery and pc port.

What do you mean by "pc port"?

Assuming that new battery was a good, genuine, compatible replacement battery, and assuming those other chargers output the correct voltage and the connectors were wired the same, it sounds like your notebook's power circuits are faulty.

Running on the charger alone should allow the laptop to run at full performance. The fact it doesn't even do that - with multiple chargers - further indicates the power circuits are at fault. This assumes the notebook is not infected with malware.

If it is still under warranty, you need to contact Dell. Otherwise, I think you need to take it to a reputable shop - it may need a new motherboard.

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vLadJerome

Discussion Starter · #3 · Mar 5, 2022

Digerati said:
What do you mean by "pc port"?

Assuming that new battery was a good, genuine, compatible replacement battery, and assuming those other chargers output the correct voltage and the connectors were wired the same, it sounds like your notebook's power circuits are faulty.

Running on the charger alone should allow the laptop to run at full performance. The fact it doesn't even do that - with multiple chargers - further indicates the power circuits are at fault. This assumes the notebook is not infected with malware.

If it is still under warranty, you need to contact Dell. Otherwise, I think you need to take it to a reputable shop - it may need a new motherboard.

Thank you for answer. I mean Dc port.

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flavallee

· #4 · Mar 5, 2022

Dell G7 17 7790 (support site)

It has driver support only for Windows 10 64-bit and Windows 11 64-bit, so it can't be very old.

What's the exact 7-character "service tag" number on yours?

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Digerati

· #5 · Mar 5, 2022

vLadJerome said:
I mean Dc port.

Thanks for clarifying but now I'm more confused.

You said,

vLadJerome said:
I tried brand new battery and pc port.

You meant to say DC port. There is only one DC port on your laptop.

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plodr

· #6 · Mar 5, 2022

I was surprised to see that two different power adapters can be used. Here are the specs.
https://www.dell.com/support/manual...a2477f-e41b-482d-9cf7-e5d81bbd5a52&lang=en-us

Were they Dell parts or 3rd party chargers? Check the amps on the power adapters you tried.

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flavallee

· #7 · Mar 5, 2022

My 2009 Dell Precision M6400 17.3" laptop can use either a 210W or a 240W power adapter.
If a power adapter with too little wattage is used, a warning in the BIOS appears during start up.

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phillpower2

· #8 · Mar 5, 2022

Make sure that Hybrid Power is not enabled.

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Digerati

· #9 · Mar 5, 2022

plodr said:
I was surprised to see that two different power adapters can be used.

The higher power one, I suspect, is marketed as being a "fast" or "rapid" charger. Toshiba used to offer a "rapid charger" for my old Toshiba as an optional accessory.

They key is the voltage must be equal, and the configuration and polarity of the connectors must be the same.

You can always go with more power (higher wattage/current), but not less. All chargers must provide enough power to run the laptop, and provide at least a little charging power for the battery too. With some, the smaller charger may not be enough for the laptop to run at "full throttle" speeds and/or allow the monitor to run at full brightness and provide enough extra to charge a discharged battery at the same time.

I would not be surprised if flavalee's BIOS warning didn't say or suggest something to that effect.

If using a lower capacity charger and the battery is completely discharged, the device may not even turn on until the battery charges up to some certain point. We see this more often on fully discharged cell phones and tablets. I remember the first time my Samsung tablet refused to turn on. When I pressed the power button, it simply showed a discharged battery icon for a couple seconds. But after about 15 minutes it powered on. That's when I decided I better RTFM.

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Couriant

· #10 · Mar 6, 2022

I would agree that the motherboard would be the likely cause of this issue if you have tried a new battery and AC Adapter and/or DC Port

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