1. bendeneo's Avatar
    Hi all,

    I stupidly attempted to change my screen/digitizer, and now have the following problems:

    When plugged into the mains or USB, the red charging light goes on for 15 seconds...... then off briefly..... then back on again for 15 seconds.....

    I took the back case off, unlplugged the various cables and connectors, but couldnt get one of them off..... so rather than do damage i decided to give up and replace all the connectors/plugs.

    Now I cannot get it to boot?

    Have I drained the battery in some strange way, or have I inadvertently completed damaged it to the point of no repair?

    Any help would be greatly appreciated.

    Regards,

    Ben
    12-21-12 03:31 AM
  2. FF22's Avatar
    Try Mapsonburt's idea in case you did somehow blow off all of the charge

    Mapsonburt:

    The PlayBook OS currently shuts down at 3.5 volts. When the battery gets below 2.67V it won't show power lights or even try to start because there isn't enough juice to even power the processor to run the code on the BIOS. The BIOS is software hard coded on a chip within the PlayBook that tells it how to load the PlayBook OS and is coded such that it only recognizes signed PlayBook boot images (which is why it is so hard to root and that nobody has been able to get one to boot Android or WebOS. The BIOS software also contains some charging algorithms for when the OS is not running - ie device is powered off but plugged into a charging source. This code ONLY runs when the battery is above 2.67 volts because the processor can't run below that.

    The root of the problem is that this design issue prevents the device from accepting any charge longer than 60 seconds when the battery is too low to run the charging algorithms on the BIOS or on the OS (one runs before the device is powered on and one runs afterwards). RIM did this because Lithium Ion batteries have a nasty habit of catching fire if not charged properly so they wanted to ensure that the processor could be in control of the charging. Makes perfect sense and they probably thought they were avoiding situations like where early Li Ion batteries on laptops were catching on fire. The problem is they were a bit too aggressive in dealing with the problem at design stage. If the battery is below 2.67Volts their protective algorithms can't run but you also can't put enough charge into the battery to charge it! Hence all the reports of people having success with stack charging.

    Unfortunately there are a lot of wrong ways to do this floating around out there and getting repeated everyone someone posts a new thread on the issue. It really should be made a sticky. What is the right way?

    1) ONLY use a source that provides 1.7Amps or more of charge. The original charger provides this. The rapid chargers provide a lot more. Your phone charger only provides a fraction of this. Anything less is going to take forever to charge the battery above 2.67 volts and may not have enough juice to charge the battery AT ALL once the processor starts to run above 2.67Volts or even worse once the OS starts to run above 3.5Volts. Forget about using your computer to charge it when the OS isn't running as the computer looks for the hardware to identify itself and won't put out a full charge current unless the device indicates it can accept. Once the OS is running, you'd often CAN get enough power from the USB on the computer but that is because the OS has signaled it is OK for the computer to send it. When the OS/BIOS isn't running, the PlayBook won't take much/any charge from a computer. The rapid chargers are best as they quickly charge but more importantly do not use the (too) flimsy USB port. A lot of problems are caused by this port getting wobbly over time and the device not getting a charge at all. Everyone should have a rapid charger.

    2) Until you get your device WELL above the 3.5Volts that let's the PlayBook boot, do NOT try to start it. Every attempt drags the battery down some more and that attempt sucks much more charge from the battery than you can put in in those 60 seconds before the hardware shuts down the charging. How can you tell where your battery is? Well if you are getting no lights on the playbook on your first charging attempt you are below 2.67volts. If lights go on and then it doesn't start the OS it is below 3.5Volts. If it loads the OS and then dies it is just above 3.5Volts. If the device loads the OS it is somewhere below 5.0Volts. Depending upon where you start (how low the battery is) various techniques work best. They are: REAL stack charging (plug in for 60 seconds, unplug, plug in for 60 seconds, repeat until the processor starts accepting charging (the big battery symbol on the screen). Again, DO NOT try to turn the device on until then. You are just working against yourself and it will take much longer. You should get the charging symbol within 20-45 minutes of repeated REAL stack charging. Forget you ever heard of plugging in for 2 mins and then off for 2 mins and similar as those 2 mins of off time are COMPLETELY worthless. I have put a multimeter on the PlayBook in this state and it NEVER takes more than a minute of charge when under 2.67volts but will accept another minute of charge after a short (1-2 second) disconnection. Just do it right.

    3) Once you see that charging screen leave it plugged in to the charger (stop stack charging) for at least an hour before you try to start the PlayBook. If you don't you may end up in a situation where the attempt to start drags that battery back down below 2.67V and you have start stack charging again. Be patient, you are almost there!

    4) Fully charge your Playbook after this to ensure your PlayBook gets back to 100%.

    Unfortunately, there isn't a lot RIM can do about this now. It's a hardware design issue. I'd be interested in knowing if the fixed it with the 4G versions. I don't think I've ever seen that complaint with one of those but I've "fixed" both of mine a few times (the kids keep trying to power them on after letting them shut down on low battery despite me saying time RUN not walk and put it on a rapid charger when ever it hits the flashing red battery signal (9%). I've also helped many friends and people on the web and NOBODY who has followed the instructions has failed to get their PlayBook to charge.

    I'm convinced this fault is the reason so many PlayBooks are returned to the stores and through RMA. RIM has been very good about this but it should never have happened. Happy Charging!
    12-21-12 08:30 AM
  3. jmc513's Avatar
    Hope you have a warranty. Send back for a new one. I had an issue similar to yours. My PlayBook ™ was stuck on the PlayBook ™ start up screen. Had to exchange mines.
    12-23-12 01:35 AM
  4. bendeneo's Avatar
    Thanks for all the advice...... but unfortunately this hasnt helped me..... I did it for 53 minutes of stack charging...... and still no joy.....

    Any other thoughts?

    Also is there any way of extracting data from the SSD?..... I am guessing not as it wont fire up.... but worth a shot....
    01-02-13 03:43 AM
  5. Zeo001's Avatar
    I have the same problem. Any answers to fix it?
    01-02-13 06:09 AM
  6. fabio984's Avatar
    My playbook doesnt turn on too. and i didnt opened it. just charged it all night...
    I put the original wall charger and after blink red, it shows a battery icon on the center of the display. and after 15 seconds appears a green led ( fixed )...
    after this, he turns ON with the BLACKBERRY PLAYBOOK letters, normally, with all the coulours we now... blue.... green... red... all colours, and at the end:
    TURNS OFF!!!?
    02-14-13 11:26 AM
  7. ezradv's Avatar
    I have the exact same issue as fabio984
    04-16-13 07:04 PM
  8. FF22's Avatar
    04-16-13 08:01 PM
  9. Nirbhay sagar's Avatar
    Hi all,

    I stupidly attempted to change my screen/digitizer, and now have the following problems:

    When plugged into the mains or USB, the red charging light goes on for 15 seconds...... then off briefly..... then back on again for 15 seconds.....

    I took the back case off, unlplugged the various cables and connectors, but couldnt get one of them off..... so rather than do damage i decided to give up and replace all the connectors/plugs.

    Now I cannot get it to boot?

    Have I drained the battery in some strange way, or have I inadvertently completed damaged it to the point of no repair?

    Any help would be greatly appreciated.

    Regards,

    Ben
    04-02-17 05:09 PM
  10. Carl Estes's Avatar
    If you haven't done anything "catastrophic" to your PB, you might be saved by "Stack Charging" your device.
    Get a power strip with a switch on it. Plug in your PB, and switch on the power strip. leave it alone for about 10/15 minutes, then switch off the power strip. Let it sit for about 5 minutes, the switch on the power strip again.
    Repeat, repeat, repeat............

    It may take a number of these "Stack Charging" events for your PB to eventually power up. How many? I don't remember, I had to do this once, a loong time ago.....
    04-06-17 09:05 AM
  11. brookie229's Avatar
    leave it alone for about 10 minutes
    Too long. You need to switch it on and off at about 1 minute intervals. At least according to post #7 here: http://forums.crackberry.com/blackbe...aybook-741383/

    This guy/girl Mapsoburt seems to know what to do, anyway.
    04-06-17 09:12 AM
  12. exvag's Avatar
    Hi there, wondering if anyone can help.
    I've followed the instructions above and have been plugging unplugging whilst timing my 1 minute intervals for the past hour and a bit and still nothing, no lights as described etc. Also tried start button plug/unplug quickly thing as per instructions and still nothing.

    The play book has been in storage for a number of years so I know the battery must be flat which is why I tried the above after plugging it in and leaving it overnight without success.

    Is there anything else I can try?

    Thanks
    08-03-17 09:01 AM

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