thinkpads.com Support Community Forum Index Bill Morrow's thinkpads.com Open Forum - The Original Thinkpad Support Forum
Follow ThinkpadsForum on Twitter
 Support this forum, shop at newmodeus.com
 Support the forum, shop at newmodeus.com
System backups occur about 7:00 am EDT and last about 10 minutes. This will slow performance. RSS feeds have been added to the forum.
Donate if you wish to:
bill at thinkpads dot com

It is currently Sun Apr 20, 2014 9:42 am

All times are UTC - 5 hours




Post new topic Reply to topic  [ 7 posts ] 
Author Message
PostPosted: Mon Nov 12, 2012 10:12 am 
Offline
Sophomore Member

Joined: Fri Mar 04, 2011 11:43 am
Posts: 155
Location: London, UK
Basically one of my user came back with a "dead" x220. I had ask them to try battery removal and hold the power button on. They told me they did. First thing I tried when it came in today was take the battery out, hold the power on, it flashed after 2-3 seconds, put the battery in and it turn on.

What causes this and whats this condition called ? Any way to prevent this ?


Top
 Profile  
 
PostPosted: Mon Nov 12, 2012 3:53 pm 
Offline
Moderator
Moderator

Joined: Tue Jun 07, 2005 6:57 am
Posts: 9663
This is how I've done it (successfully). Disconnect the AC power supply and remove the battery. Press and release the power button 10 times, then hold the power button down for 30 seconds, then release. Reinstall the battery and reconnect the AC power supply. Press the power button and see if it turns on.

If that doesn't work, try turning the laptop on with only the AC power supply connected and the battery removed. A bad battery could prevent the laptop from booting up. Happened to me a long time ago with a 600E.

_________________
DKB


Top
 Profile  
 
PostPosted: Mon Nov 12, 2012 4:10 pm 
Offline
ThinkPadder
ThinkPadder

Joined: Sun Mar 01, 2009 6:59 pm
Posts: 1459
Location: Window Rock, Arizona
The longstanding theory is that one should try draining the capacitors when one has a laptop that will not power-on. The steps GomJabbar gave are the trick to discharging the capacitors. There is no way to prevent the capacitors from storing residual charges. That is a byproduct of their job in regulating electric current. In the words of Wiki "capacitors are widely used in electronic circuits for blocking direct current while allowing alternating current to pass and in electric power transmission systems for stabilizing voltage and power flow" (Wiki). The simple trick of pushing the power button repeatedly (while all power sources are removed) is a simple application to drain the capacitors of the residual charges and enable a laptop to hopefully power up again. Hope that helps :)

_________________
X200T 7449-88U | T500 2055-2CU | T61 6458-6QU | Dell Latitude E6510


Last edited by emeraldgirl08 on Mon Nov 12, 2012 5:07 pm, edited 1 time in total.

Top
 Profile  
 
PostPosted: Mon Nov 12, 2012 5:00 pm 
Offline
Senior ThinkPadder
Senior ThinkPadder

Joined: Sun Aug 07, 2005 5:41 pm
Posts: 2612
Location: Paragould AR USA
BTW...a single press of the power button for a few seconds with all power removed will just as effectively drain the capacitors as multiple presses.

_________________
Collection = T500 - T400 - X61s - T61(14" WSXGA+) - T60p(UXGA) - X40 - T43p- T42p - A31P - A30P - 600E - 770


Top
 Profile  
 
PostPosted: Mon Nov 12, 2012 8:52 pm 
Offline
Junior Member
Junior Member

Joined: Tue Mar 06, 2007 8:01 am
Posts: 443
Location: Sheridan, WY
Neil wrote:
BTW...a single press of the power button for a few seconds with all power removed will just as effectively drain the capacitors as multiple presses.


I never knew that part. EasyServ told me to press 10 times, wait, hold for 30 seconds AND say "Abra Kadabra." I've always done it that way. I thought the only essential thing was the "Abra Kadabra" to drain the capacitors.

Anyway, I've had to use this trick on R50's, T61's, R500's, R520's and several other laptops. I never had it happen on the 1995 through 2003 ThinkPads I used.

_________________
First Thinkpad 755CX in 1995. First IBM: PC 1982 8088 w 64K RAM, dual floppy. Currently in use:
X230T with Win8Pro x64, i7, 500gb ssd; W700 WUXGA RAID 1 Blu-Ray W7Pro x64, occasionally a T61p with Win7Pro x64


Top
 Profile  
 
PostPosted: Mon Nov 12, 2012 9:03 pm 
Offline
Senior ThinkPadder
Senior ThinkPadder

Joined: Sun Aug 07, 2005 5:41 pm
Posts: 2612
Location: Paragould AR USA
barrywohl wrote:
I thought the only essential thing was the "Abra Kadabra" to drain the capacitors.
Well...there ya go...I forgot about that part. :lol:

_________________
Collection = T500 - T400 - X61s - T61(14" WSXGA+) - T60p(UXGA) - X40 - T43p- T42p - A31P - A30P - 600E - 770


Top
 Profile  
 
PostPosted: Mon Nov 12, 2012 9:08 pm 
Offline
Admin
Admin

Joined: Thu Sep 01, 2005 10:09 am
Posts: 3836
Location: Sydney, Australia - Best Address on Earth!
Neil wrote:
BTW...a single press of the power button for a few seconds with all power removed will just as effectively drain the capacitors as multiple presses.

Since the power button initiates a command action, rather than a direct mechanical action, related to power, holding it down will not necessarily achive that outcome :idea:

Cheers,

Bill B.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group