My Mikrotik Hex is 5 years old.
Not long ago it began to work unstably - periodically rebooting, I noticed that its 24 volt power supply produces about 10 volts. And I didn’t like the temperature >60 degrees.
I changed the power supply to a new 24 volt. The health system showed exactly 24 volts, but the temperature rose to 70 degrees and remained stable at that level.
I thought that there might be problems with cooling the processor and either I need to install a radiator or change the paste.
Having opened the device, I discovered that the problem was not in the processor.
It turned out that another element was heating up. When I tried to glue the radiator to it, it fell off. Judging by the legs, it was not soldered very well.
After soldering it, the problem did not go away.
When powered by 24 volts it heats up to more than 100 degrees, and when powered by 12 volts it heats up to 60 degrees.
Tell me how normal is this? What could be the reason for this phenomenon? what can be done about this?
Even if it can in theory bear such high temperatures, it doesn’t look “right” that it heats so much.
You should try replacing it with a new one, (though it is possible the (over) heating is only a symptom of some other component that is not working) properly.
AFAIK it is possible that such diodes can start dropping too much voltage, which makes the circuit powered through them draw too much current (which makes them hotter).
If the original power supply was so much under voltage, and for extended periods of time, it makes sense that it started overheating, and if it actually fell off from the soldering pads, and judging from the brownish colour of the PCB around it, very likely it went well over the 150° C, in any case it should be replaced, as likely it is damaged.
While you’re at it, replace capacitors. Some are not greatest quality and with time they can either dry up or bloat. In either case they worsen performance of whatever electric circuitry they are part of. They don’t seem to be bloated on your pictures though. There were MT device series with capacitor problems (CCR1xxx in particular) …
