Thanks for the tip, I have about 4 routers doing the voltages drops usually when the temp spikes the voltage goes above 24.5 then when the temp drops so does the voltage.. Though with a few the others I am not seeing the voltage on the system health on the ones that are not spiking or fluctuating wildly.Got a CCR1009 here with these symptoms (temperature reboot, though unit is cold). Replaced bulged caps C1442 and C1443 (680µF/10V) with Panasonic FR and it worked again. System Health showed voltage around 22V. This seemed a bit low.
Therefore I checked the (external) 24V/2.5A power supply and found that output had a 60kHz ripple with about 2V peak-to-peak and voltage drops significantly under load. Inside were two bulged caps 470µF/35V. Replaced them with Panasonic FC (didn't have FR at hand) and also replaced a good looking "low ESR" 100µF/63V, which turned out to have high ESR.
Looks like the power supply caps gave up first and then the high ripple eventually killed the caps inside the router. Lesson learned: Watch the voltage display and if it drops below 24V, replace the power supply before it causes further damage. Replacing the caps inside the router was no fun. You have to remove the CPU heatsink (heat pipe) and soldering this multilayer PCB requires a LOT of power.
Statistics: Posted by Wolfe4086 — Thu Mar 21, 2024 2:30 pm