Damaged usb interface
Damaged usb interface
(OP)
Hello.
I have an usb interace from a car diagnostic tool that i damaged. I am trying to fix this since the new one is very expensive.
Dont have welding skills on PCB so contacted a skiled friend to do this job.
Let it fall down and some SMD components got loose from their welding but i could find new ones to be welded again on the interface PCB, except one that i am not sure what is.
I hope someone give me a clue to what is this component and perhaps i can find one to try fixing the PCB.
Here is the picture of a similar intact PCB from a friend of mine, the component is next to a USB type B port. It has a red mark around it, it is marked as "E2" on the PCB.
I contacted the suplier thy dont provide schematics neither information on it, they just sell new complet unit.
This is an important working tool for me.
Thanks in advance for help.
I have an usb interace from a car diagnostic tool that i damaged. I am trying to fix this since the new one is very expensive.
Dont have welding skills on PCB so contacted a skiled friend to do this job.
Let it fall down and some SMD components got loose from their welding but i could find new ones to be welded again on the interface PCB, except one that i am not sure what is.
I hope someone give me a clue to what is this component and perhaps i can find one to try fixing the PCB.
Here is the picture of a similar intact PCB from a friend of mine, the component is next to a USB type B port. It has a red mark around it, it is marked as "E2" on the PCB.
I contacted the suplier thy dont provide schematics neither information on it, they just sell new complet unit.
This is an important working tool for me.
Thanks in advance for help.





RE: Damaged usb interface
Here is the atached picture of the PCB.
Thanks.
RE: Damaged usb interface
not a capacitor
probably a transient suppressor.
Hopefully someone will come along soon and know.
It's called soldering NOT welding.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Damaged usb interface
1. The 'E' designator is unusual. The IEEE standard uses it for "terminals", which doesn't help.
2. That's a good spot for a TVS, but the chip next to the USB port (DA1) is a USB6B1, which actually has TVS built-in. The only external components it recommends is a capacitor.
3. The U1 chip is a quad 2-input AND gate, and the pin which connects to the centre of the component in question is ground.
RE: Damaged usb interface
The question is the value. An example, made by Johanson can be found at www.digikey.com as 709-1013-1-ND 0.1uF 50V or 709-1107-1-ND 1000pF 100V.
These are used to supress internal noise from getting out of the unit, or for keeping external noise from getting in the unit. Being located close to the USB jack indicates that it is bypassing noise from either one of the I/O lines of the incomming power. Usually not absolutely necessary for the device to function, but if not replace then a small wire will have to be placed from one end terminal pad to the other end terminal pad.
RE: Damaged usb interface
RE: Damaged usb interface
Thanks for information.
So i think most opinions point out to a capacitor for noise supression?
If i place a wire instead of the component which of the three terminals should be connected with?
Thanks.
RE: Damaged usb interface
Must have missed something. If the part fell off, how are we liiking at it? We can not view this directly. If it is three terminal device and a filter, the lead connected to ground or common can be ignored.
RE: Damaged usb interface
If you're absolutely lucky, nothing will happen. If not, you may fry something.
TTFN

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RE: Damaged usb interface