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Not working ec2a

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post #1 of 4 (permalink) Old 07-02-2019, 09:35 AM - Thread Starter
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Not working ec2a

I bought an unopened ec2a as defect for 4,- Euro. Just wanted to test the shape, and thought maybe I could get it working again. If not I could swap in the g403 pcb.

Here is what I checked:
- Cable is good, tried the original and a paracord I made with matching pin arrangement.
- internal usb connector is fine, no faulty solder joints, same for the 3310 sensor.

- looked for the 3310 datasheet und checked IO voltage (pin 7) and VDD (pin 10 + 11) both are at about 3,3V

The cpi indicator led lit up in red green and blue at the same time for maybe 1/10 sec when I plugged the mouse in. Then the mouse installed correctly in win7 but does nothing, no clicks, sensor, cpi button nothing is working.

Is there other things I can check? Does sb. know if the behaviour of the led could indicate whats wrong with the ec2a?

Thanks in advance!
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post #2 of 4 (permalink) Old 07-04-2019, 05:37 AM - Thread Starter
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I fixed it.
For those who are interested or have a similar problem, it was a faulty 3310 sensor. I had a pcb with 3310 lying in a drawer because of a 3366 mod. With this "new" 3310 the ec2a is working perfectly again.

Here is a picture of the ec2a pcb with its new 3310 soldered in, and the faulty one lying in front of it.
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post #3 of 4 (permalink) Old 07-04-2019, 09:56 AM
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Cool! Nice buy, thanks for sharing!

"a bad joint can't be that bad right?" -q
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post #4 of 4 (permalink) Old 07-04-2019, 03:04 PM - Thread Starter
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I did a another little mod. Since I use 800cpi, the scrollwheel is purple, i dont like that colour.
A way to fix it is to remove the led, or you can cut the red pin to get blue light on 800cpi.

But I wanted to keep lights enabled on all cpi steps, so I switched the red and green pin from the led.
Now its cyan on the 800cpi step.

400 -green, 800 - cyan, 1600 remains blue, 3200 red
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