"Need help troubleshooting a dead G502 X plus Wireless motherboard"
Hi everyone,
I'm troubleshooting a Logitech G502 X Wireless motherboard that became completely unresponsive after disassembly and
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reassembly.
Symptoms
The mouse is completely dead:
No LED activity
No power-on response
No USB receiver detection
No signs of life
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Troubleshooting Already Performed
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I have another fully functional G502 X Wireless available for comparison.
I swapped components between the two mice and confirmed the following parts are good:
Battery
Switch board
Top shell assembly
Receiver/dongle
When I install a known-good motherboard into the same mouse, everything works normally.
Therefore, the issue is isolated to the original motherboard.
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Visual Inspection
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The motherboard appears normal.
I found:
No burn marks
No corrosion
No missing components
No cracked solder joints
No visible PCB damage
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Electrical Checks Planned
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Using a digital multimeter, I plan to check:
Resistance between battery positive and GND
L2 and L3 power rails
Q9, Q11, and Q30 power section voltages
nRF52833 MCU power supply
HERO sensor power supply
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Questions
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Has anyone seen a completely dead G502 X Wireless motherboard with no visible damage?
Are there any common failure points in the power circuit of this mouse?
Would you first suspect:
A failed MOSFET?
A voltage regulator issue?
A protection circuit failure?
A damaged nRF52833 MCU?
Any advice on common failure points or recommended probe locations would be greatly appreciated.
Attached are close-up photos of the motherboard and power section for reference.
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Thanks!