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+--- Thread: Identifying PCB components? (/showthread.php?tid=9074)
Identifying PCB components? - Tom - 19-12-2012
![[Image: 20121219_161617.jpg]](http://i817.photobucket.com/albums/zz92/tomw1123/20121219_161617.jpg)
The 2 black square boxes in the centre of the picture. What are they? I think the top one is broke but without knowing what they are or do im just basing that on the difference between readings compared to the other. Cheers
RE: Identifying PCB components? - darrenjlobb - 19-12-2012
Its a fet (mosfet)
Did you de solder it to read over it? else your just reading whatever else is connected in circuit...
RE: Identifying PCB components? - Tom - 19-12-2012
Nope just probing in situ (giggidy)
Hmmm, Something in this power circuit is shot to shit, I'll have to remove the motherboard to de solder it wont i?
We're both talking about the 2 black boxes FDD6685 yeh?
Identifying PCB components? - Jonny b - 19-12-2012
No you won't have to remove the mother board! Get a heat gun on it, try to insulate parts that look like they will melt, how old is the the board? if its fairly newish get some leaded solder on the fet your taking off
I'll have a look in stock in the morning see if I have any on the shelf
RE: Identifying PCB components? - Tom - 19-12-2012
Heatgun? Whatever for haha? I feel i'm missing something. Not my lappy just a friend asked if i could take a look and i want to try and help him out :p
Identifying PCB components? - Jonny b - 19-12-2012
To take it off
RE: Identifying PCB components? - Tom - 19-12-2012
Wouldnt i just use the soldering iron?
Identifying PCB components? - Jonny b - 19-12-2012
The 2 front legs yes, but depending on the iron you have and the solder that's on the board! If its a relatively new board it will be unleaded solder that has a much higher melting point you may struggle to get enough heat in the main pad to get it off without pulling pads up and damaging the board
RE: Identifying PCB components? - Tom - 19-12-2012
Ahh alright buddy i get you now!
What do they do first? lol
RE: Identifying PCB components? - cully - 19-12-2012
http://www.fairchildsemi.com/ds/FD/FDD6685.pdf
RE: Identifying PCB components? - vincent1 - 19-12-2012
this is a very good site to use i use it mainly for lcd/plasma repairs its free to join the forum some great guides on testing and removing the fets on you tube best bet hot air gun imo can be done with a good soldering iron but post your problem up on the forum maybe a common problem there is already a answer to.
http://www.badcaps.net/forum/forumdisplay.php?f=23
Identifying PCB components? - Jonny b - 19-12-2012
It basically changes the signal that goes In we could be here all night as there are so many variations
RE: Identifying PCB components? - Ruan - 19-12-2012
They're essentially an electrical switch that's controlled by electricity, it's a Power FET so it's probably using a low level computer voltage to switch something that consumes quite a lot of power...
Looks like that IC below the two fets is a Charge control IC, so they probably have something to do with the switching of the battery charge circuit...
RE: Identifying PCB components? - cully - 19-12-2012
guide to testing the fet with a multimeter
http://www.4qdtec.com/mostest.html
Identifying PCB components? - Jonny b - 19-12-2012
Actually looking at it again that qfn looks to have a dry joint top right hand pin!! Can still see the gold finish on the pad. Not been dropped this lapto has it
Also I can see 1206 components on 1210 package size pads tut tut
RE: Identifying PCB components? - Tom - 19-12-2012
Its been dropped plenty.. and thrown i would of thought lol
RE: Identifying PCB components? - Ruan - 19-12-2012
Lol glad someone else noticed the 1206 on 1210 pads....
RE: Identifying PCB components? - Tom - 19-12-2012
(19-12-2012, 08:09 PM)Ruan Wrote: Lol glad someone else noticed the 1206 on 1210 pads....
Explain? Does that mean someones been in side this one before? Or cos its ace and shit? haha
RE: Identifying PCB components? - Ruan - 19-12-2012
Basically someone's put down pads that are sized for 1210 components, and put 1206 components on the board... 1210 and 1206 are basically standardized copper pad sizes for surface mount components.
RE: Identifying PCB components? - Tom - 19-12-2012
Does my very shit multimeter have a "Diode Test Range"??
![[Image: 20121219_201638.jpg]](http://i817.photobucket.com/albums/zz92/tomw1123/20121219_201638.jpg)
Identifying PCB components? - Jonny b - 19-12-2012
(19-12-2012, 08:09 PM)Ruan Wrote: Lol glad someone else noticed the 1206 on 1210 pads....
Ha ha I build all sorts mostly prototypes
![[Image: e9umedaj.jpg]](http://img.tapatalk.com/d/12/12/20/e9umedaj.jpg)
That was one I done last week all hand built!! 0402's and 0201's pain in the arse
RE: Identifying PCB components? - mcdub - 19-12-2012
The red one mate
(19-12-2012, 08:20 PM)Jonny b Wrote:(19-12-2012, 08:09 PM)Ruan Wrote: Lol glad someone else noticed the 1206 on 1210 pads....
Ha ha I build all sorts mostly prototypes
That was one I done last week all hand built!! 0402's and 0201's pain in the arse
![[Image: y9emeze9.jpg]](http://img.tapatalk.com/d/12/12/20/y9emeze9.jpg)
That cannot be easy. I'm an electrical design engineer and we do HV stuff, I wouldn't know where to start with surface mount components
RE: Identifying PCB components? - Tom - 19-12-2012
Why cant the guide just say its the continuity thing -.-
Identifying PCB components? - Jonny b - 19-12-2012
Ha ha
RE: Identifying PCB components? - Niall - 19-12-2012
(19-12-2012, 08:20 PM)Jonny b Wrote:(19-12-2012, 08:09 PM)Ruan Wrote: Lol glad someone else noticed the 1206 on 1210 pads....
Ha ha I build all sorts mostly prototypes
That was one I done last week all hand built!! 0402's and 0201's pain in the arse
Jonny what is that for? Looks like its from a Apollo ISB
Identifying PCB components? - Jonny b - 19-12-2012
It was for targeting is all I can say bud
RE: Identifying PCB components? - Niall - 19-12-2012
(19-12-2012, 09:48 PM)Jonny b Wrote: It was for targeting is all I can say bud
Ah not what i thought then. Was gunna say ive got one of them thats been smashed to f*ck in the back of my car lol
Identifying PCB components? - Jonny b - 19-12-2012
Ha ha yeh probably not something you would have in your boot
RE: Identifying PCB components? - cully - 19-12-2012
looks like 4 gps receivers
Identifying PCB components? - Jonny b - 19-12-2012
(19-12-2012, 10:17 PM)cully Wrote: looks like 4 gps receivers
Nope nothing like it now go away cully haha