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> Driver Side Windows Control Smd Transistor Buzzing
gica
Posted: March 03, 2016 06:13 pm
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Hi guys I am changing the lights on the door controller in my 04 Trailblazer and I shorted something which lowered the voltage from 13+ to 5+V. So I grabbed the passenger side one and measured in parallel and found that the transistors near both light sockets are toast. The passenger side transistor 2+1 pin SMD reads 6Cs 41 on it. I looked in my electronic junk box and found an older Dell laptop motherboard and found some transistors that look the same but I am sure are different. The ones I put in have 702-38 written. I read about it on a website ( http://www.marsport.org.uk/smd/mainframe.htm ) and mine is BC817-40 Sot-23 and I think it's an NPN transistor and the other is 2N7002 transistor n-ch mosfet 60V 0.11A still SOT-23. Now I know the 2 are different on paper and the issue is that there is a buzzing noise coming from the box. Don't know where but it has to be related to the transistor and/or the one capacitor I changed, I do get the 13V now and the lights dim properly but there is the buzz. What should I do as I am sure there is a current problem in there? Thanks in advance for any help.
I have pictures but didn't see a place to insert them.
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BlueVanACD2005
Posted: March 03, 2016 11:21 pm
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QUOTE
I have pictures but didn't see a place to insert them.


Use Photobucket.

You generally can't interchange bi-polar transistors and MOSFETs, they work a little bit differently.


-Spenser
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gica
Posted: March 04, 2016 09:45 pm
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I realize that, but in identifying the NPN according to the writings on it 6Cs and 41 which tells the story the 6Cs or the 41. I looked on another with Y9 and it's marked right where the 41 is written. You can see how that could mean different things.
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gica
Posted: March 05, 2016 08:14 am
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http://s1279.photobucket.com/user/gica69/library/

For pics

This post has been edited by gica on March 05, 2016 08:15 am
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Gorgon
Posted: March 10, 2016 11:49 pm
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Can be this: 2 different footprints.

6Cs BC817-40 Si-npn AF-Drv, 50V, 500mA, 330mW, B=250..630, >200MHz SOT-23 16ta 3a - Sie
6Cs BC817-40W Si-npn AF-Drv, 50V, 500mA, 330mW, B=250..630, >200MHz SOT-323 16ta 3a - Sie

TOK wink.gif


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