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hp elitebook 840 g6 not charging and turning on

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TheFerretRanch

TheFerretRanch

PCHF Member
Jun 14, 2023
49
1
23
#1
Hi, I have a problem with my laptop not charging or turning on. I’ve tried many things to get it started but nothing works. I’ve removed the batter, took it all apart and put it back together, held down the power button many many times, and so on. I’ve done a lot of research and can’t find anything in how to fix my specific model. The warranty on it is also expired. If anyone is able to help find a way to fix it without it costing a whole motherboard, I would be grateful.
 
#2
Did this first happen right out of the blue or did you have problems before this.

Is there any sign of life at all, any LEDs blinking etc, this includes on the AC adaptor/charger.

Does the AC adaptor/charger feel warm to the touch if you leave it connected to the notebook and power outlet.
 
#3
phillpower2 said:
Did this first happen right out of the blue or did you have problems before this.

Is there any sign of life at all, any LEDs blinking etc, this includes on the AC adaptor/charger.

Does the AC adaptor/charger feel warm to the touch if you leave it connected to the notebook and power outlet.
Click to expand...
It happened right out of the blue. The chargers do work, and the laptop went form charging without turning on to not charging or turning on at all.
 
#4
You have not answered all that was asked, trying to help you here but am not prepared to torture you for any requested information :(

phillpower2 said:
Is there any sign of life at all, any LEDs blinking etc, this includes on the AC adaptor/charger.
Click to expand...
phillpower2 said:
Does the AC adaptor/charger feel warm to the touch if you leave it connected to the notebook and power outlet.
Click to expand...
 
#6
No signs of life from the notebook as in no LEDs blinking but the charger being warm suggests that the MB has failed, the power circuit that includes the battery charging function is most likely and caused by a loose or shorted out DC jack port.
 
#7
phillpower2 said:
No signs of life from the notebook as in no LEDs blinking but the charger being warm suggests that the MB has failed, the power circuit that includes the battery charging function is most likely and caused by a loose or shorted out DC jack port.
Click to expand...
I thought that was the case too, but I had no way to confirm. I did use a thermal camera to detect that some chips are getting warm on the board though, only when plugged in. The CPU isn’t warm at all.
 
#13
Your heat test as good as confirms that the issue is terminal and the only test left would be to try a known good CPU.

I suspect that you may find that it will not be a cost effective repair if it is the board and with labour costs included even for them to replace the CPU.
 
#14
The cpu cannot be removed without a heat gun since it directly soldered on there. But I do get your point, it maybe the CPU and to replace it might cost the entire motherboard. I don’t have any experience in heat gun soldering, only regular old pencil soldering.
Click to expand...
phillpower2 said:
Your heat test as good as confirms that the issue is terminal and the only test left would be to try a known good CPU.

I suspect that you may find that it will not be a cost effective repair if it is the board and with labour costs included even for them to replace the CPU.
Click to expand...
 
#15
You seem to know your way around the notebook so why not swap out the MB yourself if it is confirmed to be bad.

Just a thought, any change in the behaviour if you remove the RAM from the slot/s and then press the power on button while hooked up to the AC adapter.
 
#16
#1 I don’t have a MB to swap and to get one I have to buy it off of places that sell the MB but just as broken as mine.

#2 I’ll see if I remove the ram if I get a different result, but I believe I tried that already.
 
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#17
You can get fully working MBs for your notebook and from ebay, suggest that you get some prices from the likes before you head to the PC repair shop, they will only be able to obtain a board from a similar source but will add a bit on top of the cost + the fitting charges.

Only suggested as it was not mentioned within the thread and just trying to make sure that we exhaust all checks.
 
#18
I might buy on on eBay but the minimum price for a “working” one is around 100$. Another thing I would have to check is if it has the same CPU installed, which would make this hunt harder. Also I tried pulling the ram out again and still no signs of life

I also have to mention that I did do a full tear down and fully reassembled it, still no life.
 
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#20
Alright, I’ll look into it and see if I can get it fixed. Thank you. Although I don’t know why it would just drop dead, it was working perfectly fine.
 
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