So now I really don't know what's the problem can you guys help me

⟐ Commented December 29, 2025 at 16:06 MST

⟐ Answered August 12, 2023 at 14:03 MST

⟐ Commented July 25, 2025 at 23:32 MST

⟐ Answer edited February 25, 2022 at 2:37 MST

⟐ Commented May 04, 2026 at 21:52 MST

⟐ Commented February 25, 2022 at 12:52 MST

I have downloaded the HP assistant and done a battery check, the results come back as no battery detected?

I am not sure what the issue is, but we have also notice the date and time is out of sync and the laptop is only running on the AC charger, could this be an issue with the mother board?

⟐ Commented July 27, 2022 at 15:46 MST

The only sign of life is a blinking orange LED beneath the charging port.

I tested original charger with multimeter, so that is fine. Also I checked the USB-C PSU. When I plugin a volt/ampere meter to the USB-C charger I can see the PD communication from laptop to PSU is fine: it get's up to 20V and pulls 0.4A.

I also tried to detach battery and CMOS battery, press power button for 15-30 sec then only attach power supply. Unfortunately that didn't help.

Does one have an idea what that blinking orange charger LED means? Only thing I can find online is according battery things. But that LED also blinks if if detached the battery and only provide power supply.

Are there good points to test voltage on the motherboard? Does the battery voltage pins need to have ~11V if PSU is attached?

Update - 2024-03-10:

For my feelings it's pulling to much current: 420mA with not battery attached. Feels like there is somewhere a short.

I did different measurements, but don't know how to narrow it down from here. Can someone guide me on measurements?

Update - 2024-03-14

Seems like the thunderbolt controller (or some peripheral of that) causes an issue. I tested with my fingers which chip is getting really really hot and it's that JHL7340.

Can one say if it must be that chip causing issues if it's getting hot, or if that might be related to some of its peripheral? I'm wondering if it's really shorted, as PD exchange with USB-C PSU is still working (but maybe it's not that chip doing PD exchange?!)

Update - 2024-04-29

I did a lot of reading and repair video viewing (thanks Sorin) now and decided to order a replacement chip on aliexpress as well as a cheap hot air station on amazon. After some trials on an old broken PC motherboard, I replaced that BGA chip in a fearlessly mood with the new one, with the result of "no short anymore".

Unfortunately that doesn't seem to be the only thing... Measurements on the main power rail look like the second mosfet is also shorted (0 Ohms resistance). So first mosfet gets 20V input, on the output it's gone...

So now, as I have the tools, I ordered that one on aliexpress too and will try to replace it. Will keep you updated, just in case someone stumbles over that topic here.

⟐ Answered February 23, 2026 at 15:06 MST

The one on my bench presently is an Elitebook 850 G8, the one I replaced a system board on was an Elitebook 845 G7. As soon as any type of power is connected, either battery or AC adapter, the charger LED will turn on white, but blink amber simultaneously. I believe it blinks 10 times. I have been unable to find any documentation for this specific error. This persists even if I remove connections from the system board to any other hardware aside from whichever power I am connecting. Even trying to power on with no RAM gives this error, will not beep/blink to indicate the system does not detect RAM. I do not even need to indicate power on for this to occur. As soon as there is enough contact with whichever connector to transmit the necessary power, it starts.

I have even tried running a BIOS recovery to no avail. This 850 G8 on my bench seems as though it will try to power, keyboard backlight will come up, Caps lock LED will light steady, no blink codes. It's under warranty, so ultimately it's probably going to get a new system board, but I want to know what this error is.

⟐ Commented July 30, 2023 at 9:03 MST

Not reacting on any buttons combinations. Turns on only if I connect the power adapter.

Tried to change the battery but not helped.

Please help.

⟐ Answer edited April 09, 2024 at 7:31 MST

⟐ Answered February 02, 2024 at 10:39 MST

⟐ Answered October 11, 2015 at 21:54 MST

⟐ Answered June 27, 2024 at 21:30 MST

⟐ Commented November 16, 2023 at 17:56 MST

⟐ Answered July 09, 2025 at 4:45 MST

⟐ Answered October 16, 2024 at 15:33 MST

Am a student and I need help as soon as you can, exam is around the corner.

Thank you for your time.

⟐ Commented July 25, 2024 at 6:35 MST

⟐ Commented July 14, 2025 at 14:32 MST

⟐ Commented August 12, 2024 at 18:36 MST

⟐ Answered August 09, 2024 at 23:04 MST