How do I direct wire a CMOS battery

July 7, 2017 at 04:37:49
Specs: Windows 7
The CMOS battery holder on my Toshiba T135D-S1320 netbook broke off. There is nothing left that can be soldered to. Where did the + and - wires originally connect ? I plan on soldering a two wire battery directly to the motherboard.

message edited by Greg07

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July 7, 2017 at 07:16:18
Almost certainly the holder was fixed to the board by two mini pins which inserted into specific holes in the pcb. Dip or similar soldering was used to secure a solid connection between those pins and the motherboard circuitry. If can you can see where the holder was then (perhaps with aid of a magnifying glass) you will be able to see the two connection points

However, soldering to them may not be as easy as it may first appear; and unless your very adept at fine level soldering you may overheat and damage the pcb and immediate cat. tracks.

It isn't impossible to replace the holder, but it ain't a quick and easy job.

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July 7, 2017 at 07:39:11
Thanks. It was attached by fine tape. I cannot identify the points on the motherboard. It seems any schematic downloads are about $20. Was hoping someone could point me in the right direction as to where those pins may have been.

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July 7, 2017 at 08:31:54
mmm yes a quick trawl confirms that some are held in by a clip system and some by two mini (metallic?) ribbons. Presumably it's those ribbons which provide a connection too?

Even with a magnifying glass can you not see anything that looks like the broken ends on the pcb?

Was there an actual holder for the battery itself and this was attached to the pcb via the metal(?) ribbons?

Equally was (is theres still) a point of contact on the pcb for one face of the battery?

Presumably you do know exactly where battery was installed - its physical location?

message edited by trvlr

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July 7, 2017 at 08:48:06
There are "some" sources of manuals which are free; and occasionally one can find the actual service manuals there.

This is one such source. One has to register (presumably it's free etc.) to access/download and so on...

Equally perhaps chat/phone call with/to Toshiba "might" prove useful. Occasionally such outfits will help the end user; especially if you play the poor starving pensioner, student etc...?

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July 7, 2017 at 10:02:04
Easy to tell where the battery was. Even with powerful magnifier I can't find any leads. Ordered a board on eBay for $7. That should help. Or I can scavenge parts from it. Thanks for the info.

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