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Author Topic: I need some info from jdm-055 board  (Read 1588 times)

Offline knowsly

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I need some info from jdm-055 board
« on: June 25, 2019, 01:01:40 PM »
I have two bad board here so I cant check them correctly
in both if them, the red line is grounded. should be ?

what component it is in blue circle ?
what is the value of D+ and D- line ?

which pin is the source power of mediatek ic ?
whats the value of yellow cap?

many thanks



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Offline RDC

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Re: I need some info from jdm-055 board
« Reply #1 on: June 25, 2019, 01:47:18 PM »
Red line should measure around 2ohms to ground with a good multimeter. It's the antenna.

Blue circled component is a common mode choke, ~3.4ohm.

No idea what 'value' you want for D+/D- lines. Measuring Ohms to ground, on a good controller, they will be around 1.5M each.

That Mediatek chip most likely has multiple power rails. I have not traced them all out.

The Yellow Cap is just decoupling, 1000nF.
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Screwing up is one of the best learning tools, so long as the only thing you're not learning is how to screw up.

Offline knowsly

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Re: I need some info from jdm-055 board
« Reply #2 on: June 25, 2019, 10:04:10 PM »
thank you again sir

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