Author Topic: Über noob question  (Read 985 times)

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Offline per4manzTopic starter

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Über noob question
« on: March 09, 2019, 01:27:07 am »
I am working on a Macbook Pro board and see "xw7100" listed on the boardview near the backlight driver. Boardview & schematic indicates pin 1 is "GND_LCDBKLT_SGND" and pin 2 is simply ground. However, I do not see anything on the board, not even pads.

Told you - über noob question as I am pretty sure that nothing is supposed to be there (and there isn't), but am certainly looking to learn more and understand exactly what that is or isn't.

Thanks.
 

Offline Shock

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Re: Über noob question
« Reply #1 on: March 09, 2019, 08:51:30 am »
Sounds like a surface mount link between two traces. If in doubt use your multimeter and test resistance between anything directly connected to those two corresponding labels (on the schematic) and to a ground. But when you find inconsistencies double check you are looking at the right schematic or revision.

We have a repair section on the forums, if you have repair specific questions post there and include or link to the specific model, schematic and boardview etc.
Soldering/Rework: Pace ADS200, Pace MBT350
Multimeters: Fluke 189, 87V, 117, 112   >>> WANTED STUFF <<<
Oszilloskopen: Lecroy 9314, Phillips PM3065, Tektronix 2215a, 314
 

Online ebastler

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Re: Über noob question
« Reply #2 on: March 09, 2019, 09:56:14 am »
A photo would have been helpful, but lacking that, I agree with Shock: It is probably meant for an optional SMD component to connect the two separate ground nets, either a direct link or possibly an inductor? Maybe they were not quite sure what would be required for signal/noise or EMC reasons, and ended up deciding that they could get away without the part.
 

Offline per4manzTopic starter

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Re: Über noob question
« Reply #3 on: March 09, 2019, 05:12:04 pm »
Appreciate the answer guys. I will certainly repost in the repair section with more details.

 


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