Question about Compaq iPAQ H3870 Pocket PC

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Ipaq will not Charge

Ipaq 3870 is getting power to cradle, yet, will not charge, no sign of life. Should it charge independently from battery, or do I need to check and/or replace the battery? Any ideas as to how I can get my device up and running?

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Get a new battery......

Posted on May 23, 2008

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The connector in the base of the Sync board has probably separated from the sync board due to bad soldering of the pins during manufacture. I have the same problem with mine. resoldering is rather tricky though not imposible.

Posted on Apr 01, 2007

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Those batteries only last about 2 years. It's probably time for a replacement.

Posted on Feb 18, 2007

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1 Answer

I have an iPAQ hx2790b - battery does not hold power


try going in to power settings while in the cradle, tap backlight and set it so it doesnt go off. Worked for me!

Aug 21, 2009 | HP iPAQ hx2790 Pocket PC

2 Answers

Ipaq 1940 losing programmes during main battery changeover


  1. Plug the charger adapter into the charging port on the bottom of the HP iPAQ Pocket PC.
    Figure : Charging the battery
  2. When the power indicator on the top of the HP iPAQ Pocket PC turns solid amber, the unit is fully charged and can be disconnected from the AC adapter (approximate time to fully charge a unit is four hours).
NOTE: The amber charge light blinks while the battery is recharging and turns solid (nonblinking) when the battery is fully charged.In the event of a low backup battery warning, charge the unit immediately before removing the main battery to avoid data loss. To view the amount of charge left in the backup battery, tap Start, Settings, the System tab, and Power.
Charging with the universal desktop cradle and AC adapter Use the universal desktop cradle to charge the HP iPAQ Pocket PC, or synchronize the HP iPAQ Pocket PC with a computer.
Follow these steps to charge the HP iPAQ Pocket PC using the universal desktop cradle:
  1. Plug the AC adapter into an electrical outlet and connect the other end of the AC adapter to the AC connector on the universal desktop cradle.
  2. Connect the serial or USB cradle cable into the appropriate port on the desktop PC.Figure : Connecting with the cradle
  3. Slide the bottom of the HP iPAQ Pocket PC into the cradle and push firmly to seat it.
CAUTION: To avoid damaging the HP iPAQ Pocket PC or the cradle, make sure the pins are aligned before pushing the HP Pocket PC into the cradle.
    Figure : Charging with the universal desktop cradle
  1. AC adapter into electrical outlet
  2. AC adapter into universal desktop cradle
  3. HP iPAQ Pocket PC into cradle
NOTE: The amber charge light blinks while the battery is recharging and turns solid (nonblinking) when the battery is fully charged.There are stabilizers located in the universal desktop cradle that assist in aligning the unit when there is no expansion pack attached. When placing the HP iPAQ Pocket PC with an expansion pack attached into the universal desktop cradle, the stabilizers will be pushed down by the expansion pack. To release the stabilizers for use without an expansion pack, press the button on the back of the cradle.
Charging with the optional USB Autosync cable Charge the HP iPAQ Pocket PC using the optional USB Autosync cable by connecting the Autosync cable to the HP Pocket PC and the personal computer. The HP Pocket PC will be charged using power from the personal computer.
For more information on charging the HP Pocket PC using the optional USB autosync cable, from the Today screen, tap Start, Settings, the Systemtab, Power, the USB Charging tab, Settings, and Help.
Charging a low battery The HP iPAQ Pocket PC will not turn on if the battery has a low charge (less than 3.2 Volts). Fully charge the battery prior to using the HP Pocket PC.
If the charge on the battery goes below the 3.2 Volts as a result of not being connected to the universal desktop cradle or the AC adapter, no damage will occur to the battery. However, the HP iPAQ Pocket PC charge indicator light will not flash until the battery reaches the minimum charge of 3.2 Volts and a normal reset is performed.
Follow these steps to charge and reset the HP iPAQ Pocket PC:
  1. Connect the HP iPAQ Pocket PC to an A/C power supply.
  2. Charge the battery to the minimum level of 3.2 Volts (this will take 5 to 30 minutes depending on the current charge level).
  3. Perform a normal reset by using the stylus to lightly press the Reset button on the bottom of the HP iPAQ Pocket PC.
  4. Turn on the HP iPAQ Pocket PC.
Keep the HP iPAQ Pocket PC connected to the universal desktop cradle or AC adapter when it is not in use.

Aug 25, 2017 | HP iPAQ H1945 Pocket PC

1 Answer

Hp ipaq seems dead


Without know exactly what already you tried to powered it on, I can only especulate on all the possible reasons, so let go one by one throuh them and their possible solutions:

1. The RX3000 Ipaq family has a known mechanical issue on the switch that senses when the back cover lid is properly closed.

When the switch is nor properly depressed, the PDA won't charge the battery if plugged on the cradle or to the USB sync cable, or won't turn on.

Remove the back cover lid and the battery, put them back again. Check the cover lid is placed flush and that there is not any gap between the cover and the PDA body.

Try again in power it on and/or charge the battery, confirming the orange LED light is turning on.

2. Either the cradle/USB sync cable or the AC wall adapter are defective.

The PDA won't power on if the battery is not charged to the minimum voltage for it. If the AC wall adapter or the cable/Cradle are defective, won't power on.

Put to charge the battery and confirm the orange LED light is turning on. If so, the you can discard that the cradle/USB cable or AC wall adapter are defective.

It the orange LED light won't turn on, it may be either one of these three parts that are defective, or that the back cover lid is not properly closed.

3. The battery dried out. If the battery is defective or won't accept charge, the pda won't power on.

To discard a defective battery, put the PDA to charge it, and it will power on when plugged to the USB cable or to the charger, and check in the settings screen, on the power icon, if the battery is charging.

If the back cover lid is properly placed, and the PDA won't power on when plugged to the USB cable or AC wall adapter, then the battery is not the problem.

4. Discarding that the battery or the USB cable or cradle or the back cover lid are the problem for this problem, the only option that is left is that the main board is defective.

Such failure on the mainboard could be caused for several reasons (moisture or humidity or water damage, or a electronic component that is worn out, or a integrated circuit that is shorted, etc) but it can be only verified and confirmed by an electronics technician.

You have the option of send it to be repaired, or try it yourself, which will require to buy a PDA with working mainboard (or the mainboard alone) and swap the parts. It requires a minimum of technical skills to do it.

Best regards,

Dec 10, 2008 | HP iPAQ RX3715 Pocket PC

1 Answer

Compaq Ipaq not Charging


As I understand it, the basic cradle that comes with the Compaq Ipaq 3870 does not charge. If I were you, I'd either seek out a charging cradle or google the instructions for modifying your cradle to charge. Good luck...

Dec 02, 2008 | Compaq iPAQ H3760 Pocket PC

2 Answers

H6315


I got the same problem. I even tried to plug the battery to the second battery charging slot, still couldn't get it back to life. But the Ipaq screen lights on with progress bar progress for about 5 seconds, then dead again. I even doubted the battery was toasted.
I gave it a final shot:
1. Remove the battery, and then put it back.
2. While the screen lights on, within 2 seconds, cold reset the unit by press the hole with stylus and push the power button at top in the same time.
In my case, the progress bar will keep going until I see the tap screen instruction and everything back to normal. But it reminds me that the removable battery is totally discharged. So I put it in cradle and I am able to synch it with my PC. Everything seems o.k. while it sits in the cradle, except the charging light won't turn red.
When I remove it from the cradle, it still lights on, battery shows 99% which is healthy. but when I turned it off, it won't start anymore. I have to repeat the above steps to revive it. Sometimes I have to remove the battery and wait for a while and then put it back, so that the screen can light on to give me chance to cold reset.
Conclusion: Maybe need a new battery. I will check Ebay to get one.
Please post if you have other solutions.

Dec 22, 2007 | HP iPAQ h6315/h6365 Pocket PC

1 Answer

Ipaq unresponsive


That's a very odd scenario. Have you tried putting it on the cradle without the battery? One possibility is that it was an incorrect battery that you put into it and it somehow fried the PDA. That's however very unlikely. Have you tried putting your old battery in it?

Nov 16, 2007 | HP iPAQ H3635 Pocket PC

1 Answer

Red Light


try to charge ur phone on other cradle if its getting charged then problem with the cradle or else try another battery in ur phone or contact service centre for more support good luck

Oct 11, 2007 | HP iPAQ hw6515 Pocket PC

7 Answers

Cannot power on...


How to correct iPAQ 5450, 5455, 5550, 5555 battery charging problems / dead unit syndrome.

The iPAQ 54xx or 55xx will not power on if the batteries charge is lower than 3.2 Volts, if your battery charge falls below the 3.2 volts level your unit will not turn on, you need to plug the iPAQ into a cradle or AC charge adaptor. Note the charging light on the iPAQ will not flash at all (normally flashes orange) until the battery charge has reached a minimum charge level of 3.2 volts. You then need to perform a normal reset, then the unit should switch on normally.

HP Procedure is as follows:

To charge and reset the iPAQ Pocket PC h5400:

i) Connect the iPAQ Pocket PC h5400 to an A/C power supply.
ii) Charge the battery to the minimum level of 3.2 Volts. This will take 5 to 30 minutes depending on the current charge level.
iii) Perform a normal reset.
iv) Power on the iPAQ Pocket PC h5400

It is recommended that you keep the iPAQ Pocket PC connected to the Universal Cradle or Cable when it is not in use.

Apr 30, 2007 | HP iPAQ HX4700 Pocket PC

1 Answer

My iPAQ will not charge or turn on ...


Can you get the iPaq hooked up directly to AC power? There's apparently a charging threshhold for badly depleted batteries that the USB port cannot get over.

Sep 08, 2005 | HP iPAQ H5555 Pocket PC

1 Answer

My H5450 won't charge!


When you charge up your iPaq, do you use the cradle, or do you use the AC-adapter with the little iPaq power converter that came with the iPaq? Try both, and see if it charges up your pda. Try and borrow an iPaq car-charger and see if it charges up that way (the ones that do not need the iPaq power converter). If you are lucky enough to power up the iPaq even for 2 minutes, enable USB fast charging in the SETTING -> BATTERY. Your USB-data-cable or cradle will then be able to charge it up that way...

Sep 08, 2005 | HP iPAQ H5450 Pocket PC

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