Question about HP iPAQ HX4700 Pocket PC

7 Answers

Cannot power on...

Unit worked well this morning - docked all weekend. Colleague couldn't power his 4700 up. Offering help, I took battery from mine and put it into his. Didn't work. Worse, I put his battery into mine. Didn't work - now they're both dead. Both batteries have full charge. Soft resets (Stylus in the end) didn't work, Hard resets - (hold two keys + stylus in the end) didn't work. Neither unit powered up when docked (tried three docking stations). Neither unit powered up when docking station bypassed and plugged direct to A/C for charging. No charging lights, nothing. Dead... Lastly, I tried removing a media card and re-inserting it (which usually forces powering on) - nothing. Any ideas?

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  • cempey Nov 11, 2007

    I have the same problem. While it was online upgrading software it powered off by itself and now even after hard reboot and battery locked in place it will not turn on. I also tried reinserting the SD card and still nothing.



    cempey@hotmail.com

  • johnmoses Jan 10, 2008

    I have a very similar problem. Was connecting to wi fi when unit turned off. I turned it back on but is cut off again shortly another attmept to turn it on resulted in the blue Hp iPaq screen coming on but nothing further. I cannot turn it off, get past this page. I disconnected battery for short time. same result. Disconnect several minutes. Sames result. Plugged into ac charger, usb port on laptop. same result. I don't know if these problems are related or not, but the battery locks are secure, battery charged.

  • Tim Crittenden Jan 14, 2008

    the battery "lock" tabs were the solution for me. Acutally figured out with help of HP support (via IM)...wi-fi search f/b shutdown isn't an issue. I've heard that the PDA equivalent of a CMOS battery is probably at fault. They run out and can only be replaced at HP headquarters.

  • Tinman62 Apr 10, 2008

    My unit is completely dead too! I have tried all f the items discussed and no luck. It is completely dead. Last week it acted funny a few times. Quite common to the discriptions earlier where it would not turn off or would turn on with no back lighting.



    Its ironic that so many are failing at this exact time frame.



    Discription: No lights, w/ or w/o charger. Chk'd battery lock switch. OK



    Left battery out 40 minutes still nothing. Can't sync. Dead....

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7 Answers

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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.

Posted on Apr 19, 2008

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The AC charging lead adaptor looks identical to the adaptors used for other devices. The internal wiring in these adaptors is not consistent. I know from bitter experience that using an XDA2 adaptor on a hx4700 will burn out the printed circuits on the motherboard.

Posted on Oct 26, 2008

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When you insert the battery inthe hx4700, the battery lock must be in the locked position.
This lock closes a microswitch inside the PDA.  If the microswitch is not closed, then the PDA will not do anything, including power-up, charge the battery etc.

Unfortunately, the microswitch is very tiny and (in my opinion) quite feeble - definitely not up to the job, especially if you remove and replace your battery frequently (many people carry spare batteries).
On my hx4700, this switch failed.  At the time, I just assumed the whole thing was dead and bought another off ebay.  The same thing happened with the second one.  I guess the switch can be replaced (at some ridiculous price).
I read somewhere about somebody who permanently shorted out the connection by soldering a wire across the switch terminals and it had no ill effects.  I wouldn't necessarily recommend it though.

Posted on Sep 23, 2008

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Having the same issue myself but when I plug it into the wall with the AC adapter it powers up but the date goes back to March 2005. Just got the device via e-bay waiting to hear from vendor.

Posted on Jan 14, 2008

  • asnyc01 Jan 14, 2008

    I took the battery out and left it out for about 30secs and still no power. Both tabs are in the lock position, and still nothing as of yet. I don't understand, could it be the battery? The battery shows a charge of 98% this morning.

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Try to take the battery out for about 10 seconds and insert back in. Good luck!

Posted on Dec 30, 2007

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Make sure that the battery lock is pushed back to the correct position.   i.e towards the reset button.    If it is not locked the machine will not power up.

Posted on Oct 29, 2007

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Make sure the 2 black tabs on the battery cover are in the "lock" position.

Posted on Jan 07, 2008

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