Help Finding Battery Connection Pins on Schematic - Page 1
Forum section: electronics / repair

author: canadaboy25
author_rank: Regular Contributor
timestamp: December 31, 2015, 05:46:36 pm
content: Hey guys, I am attempting to bring back my Toshiba A205 laptop that I foolishly killed.I have a thread herehttps://www.eevblog.com/forum/repair/battery-connector-shorted-on-laptop/which explains exactly what I did to it. Long story short, I shorted two of the pins on the battery connector together and now the laptop will not stay powered up.The reason I am making a new thread is because I am having some issues understanding this schematic. I am used to reading Panasonic schematics for plasma repair and this one seems to be laid out in a different way.All I am trying to find at this point, is where all of the pins on the battery connector are in the schematic. Do I just need to search through the whole thing and look for pins which have a name that would suggest that they connect to the battery or is there something that I am missing on the schematic itself? The laptop has 9 pins but some of them may just be electrically connected for increased current handling.Thanks a bunch in advance.

author: jdraughn
author_rank: Regular Contributor
timestamp: December 31, 2015, 09:16:54 pm
content: They are right there on page 5 super obvious.

author: canadaboy25
author_rank: Regular Contributor
timestamp: December 31, 2015, 09:41:59 pm
content: Quote from: jdraughn on December 31, 2015, 09:16:54 pmSo what you're saying is the battery module only has 3 connections the the motherboard? One of those connections is to the wall plug adapter.

author: SL4P
author_rank: Super Contributor
timestamp: December 31, 2015, 11:47:58 pm
content: This...

author: reagle
author_rank: Unknown
timestamp: January 02, 2016, 05:32:53 am
content: Any idea which pins on CONN500 you shorted?Not much on that interface should lead to the symptoms you describe- it at least should stay up when AC powered.

author: SL4P
author_rank: Super Contributor
timestamp: January 02, 2016, 07:21:21 am
content: Quote from: Monkeh on December 12, 2015, 11:46:18 pmAs mentioned in other posts from the other thread - at first guess from the supplied schematic), I'd be guessing that you shorted pins 2 & 3. The zener might save you (depends on the breakdown voltage).No other adjacent pin numbers look like they'd do anything permanent - unless the pin numbers are staggered somehow.The bad news is that Pin 3 - BAT_ID goes directly intoU22(Winbond LQFP 128 pkg)Which ;ools like a general mainboard controller for all non CPU requirements.It doesn't bode well for a quick fix unless Santa was smiling on you. Check the zener diode, or replace it - you might get REALLY lucky...!

author: canadaboy25
author_rank: Regular Contributor
timestamp: January 02, 2016, 04:49:24 pm
content: I was thinking that it may have been the bat_id pin that got shorted.The main concern I have is that the board is still actually working. I can boot into the BIOS and Linux will start to boot. All functions seem normal except the fact that it shuts itself down right away. Would there be any way that I can override the signal that is shutting down the laptop jut to see if it will continue to run?

author: canadaboy25
author_rank: Regular Contributor
timestamp: January 02, 2016, 09:00:49 pm
content: I'm not sure what pin on this chip could even control a shutdown for the whole laptop. The kill_swch pin is just for the wi-fi on off switch.

author: canadaboy25
author_rank: Regular Contributor
timestamp: January 02, 2016, 09:24:01 pm
content: If it does end up that the Ec is fried I'm not out of luck yet because they are literally dirt cheap --->http://www.ebay.com/itm/Brand-New-WINBOND-WPC8763LDG-WPC8763-LDG-Chipset-graphic-IC-chip-/180815951085

author: amyk
author_rank: Super Contributor
timestamp: January 03, 2016, 12:46:15 am
content: Quote from: canadaboy25 on January 02, 2016, 09:00:49 pmEC_PW_ON.You should check ACPRES signal, that indicates AC adapter is plugged in. The EC may not be seeing a signal from the battery nor ACPRES, so it shuts down after a timeout.I haven't been able to find the full datasheet for the EC but many of them contain their own embedded ROM, and the ones you can buy are likely blank, so you'll have to figure out how to reprogram one.

author: G7PSK
author_rank: Super Contributor
timestamp: January 03, 2016, 05:35:16 pm
content: Out of interest have tried to run the laptop without the battery installed, the fault might be with the battery board only.

author: canadaboy25
author_rank: Regular Contributor
timestamp: January 05, 2016, 06:11:33 am
content: Quote from: amyk on January 03, 2016, 12:46:15 amI will be sure to check that. I had a sneaky suspicion that there was more to replacing the EC than just re-soldering a new one in. So I'm guessing that theres no way to get the files needed to reprogram itQuote from: G7PSK on January 03, 2016, 05:35:16 pmYes, I have been testing the laptop without the battery because the battery doesn't work at all. I know for certain that the laptop works without the battery because I have used it like this lots before.