Question about Compaq tc4400 Tablet PC (RL875AW#ABA)

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Compaq tc 4400 battery does not charge

I request your help, not burden indicates that the battery charging but not charging anything and when you connect the AC adapter becomes slow thanks for your attention.

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  • garciasoscar Dec 15, 2008

    Greetings, and installed a new battery, and loading on another
    computer, and the problem continues, the battery indicator tells me
    that this is not carrying the burden but, I suspect that the problem is
    the mother board, if you can send me your comments, thanks for your
    attention.

  • garciasoscar Jan 06, 2009

    Sincerely thank you for answering the problem is not in the operating
    system installed Vista Business and try and install Vista Home Basic
    and the problem continues, I suspect that the problem is the bios, I
    hope your comments, thank you for your attention.

  • maxchu Jan 08, 2009

    battery of my tc-4400 is not working. the pc seems to indicate the unit is charging but the indicator on the battery itself is off.

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  • 4 Answers

You may need a new battery... Somehow the way to test this is to try charging it on another laptop of the same model.

Posted on Dec 15, 2008

  • sakao Jan 01, 2009

    it could be a problem with your OS (operating system)... i would try that before going for a new motherboard! And you are welcome!

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How do you know the battery is good? does the multimeter really read more than the battery should give, according to what is printed on it?
A 3,7 volt battery, should give at least 3,8, wham not connected. A 7,2 at least 7,4. Because the printed voltage should be on the connector, when you are discharging the battery.

When your charger is blinking, it could indicate the battery is not well. The Ri can be to high or something else, is wrong, and that is ht the charger won't or can't charge.

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Laptop hp compaq tc 4400 is not charging , during adapter connected to laptop and turning power/standby led ... it doesnt switches on, instead battery charging led blinks 4 times, and doesnt turns on, so...


Whenyou connect the power adapter into the laptop, does the power LED lightup? If not then - The battery adapter or the adapter's power lead or the laptop's powersocket could be faulty. Check power adapter's DCplug that connects into the laptop power socket with a multi-meter, the voltageshould be slightly higher than the voltage that is printed on the label on thebottom of the adapter. If the voltage is zero or way below the voltage that isprinted on the label then the power adapter is faulty and needs to be replaced. If the adapter is OK thenconnect it to the laptop and power it up, then look at the power/batterycharging LED light and wriggle the power plug in the laptop's powersocket. If the power/battery LED light flashes and in a certain position thisLED light stays firm, then the power socket is either faulty or it has a drysolder joint where it is connected to the motherboard. This can be repaired but itrequires the laptop to be completely dismantled to get at this power socket andrepair. If you cannot DIY then I suggest you get a quote first.

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You can actually short out the on/off circuit with a flat head screw driver. I have to do this until I can find somewhere to purchase a replacement sliding switch to attach to the new motherboard which I have waiting to be installed. Alternatively purchase a cheap docking station off ebay

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The THERMAL PASTE which bonds your laptop's heatsink and cpu together is not good. It will not obsorb the heat good enough, which causes your laptop to OVERHEAT from time to time... Have someone re-apply a new thermal paste on it then it will be fine...

- I've worked on laptops and desktops for 10+ years. Take my words for it.

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When the Batt is inserted and you are on AC power do you have a lit charge light? It's the one in the center of the three at the lower right when you are in landscape mode.
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I could recommend a new batt (e-bay) if thats your only trouble. Nothing lasts forever. I'm in Missouri and will calibrate your batt if you want to mark it and ship it. Let me know.
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