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G502 lightspeed not working except for battery lights

Good evening.

So I got a cheap used G502 under the pretense that the USB was busted and while it would charge, on wired mode it would not work, windows would not recognize it, or even give the little jingle when plugged in... but it would charge.

So I think "ok challenge accepted, it's probably that the data bus on the usb is busted. I solder in a new one and I get a cheap wireless G502 that I've been wanting for years!"

Nope, wireless doesn't work either, G-hub detects the dongle but that's it, It turns on but it doesn't pair with the dongle, it's like the firmware is stuck in some weird infinite loop. The battery indicators are always on and the Logitech logo light is always off. Switching it on and off does almost nothing as well, all it achieves is flickering off the battery indicators for a split second before they turn right back on. If I do it quick enough then maybe the logitech logo light will flicker on for just a nanosecond.

I opened up the device to see if I could figure out what I'm dealing with, here are pictures:

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So yeah, and since it's second hand I doubt Logitech is gonna let me RMA this. Any ideas?

As far as I can tell the button daughterboards seem fine btw.

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Fixed it by removing this soder:

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hey, I just had a similar issue, battery indicator lights come on when switched on, but mouse doesnt get detected in windows device manager when plugged in, only the dongle is recognized

I have turned off the "G" LED, so I dont know if thats also flashing like yours.

now I thought after reading your post, that the removing solder didnt actually solve the problem, rather the disconnecting the battery from the board (which you probably did before soldering)

so I tried to only disconnect the battery and it worked again - I think the switch on the bottom of the mouse doesnt really cut the power of the battery, more likely it tells the mouse to stay in standby even if moved around, so disconnecting the battery probably did only reset the mouse and let its uController start again from eeprom

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