Specs

See References for more details.

Internals

Problem

Received notification indicating that the fan 1 had failed.

When I checked on it, it appeared to be un-responsive.  Could not see it on the network after rebooting.

LEDs

Status - OFF

LAN - typical flashing for lan port

USB - blue

RED LEDs for HDs

Fan is running at full.

No POST beep  

Reason for the Failure

Fix

https://www.youtube.com/watch?v=c5k8FWe6u60

Measure the voltage across pin1 (LPC CLK) and pin 8 or 10 (GROUND) on the LPC-CN1(10-pin connector, next to 4-pin COM1 connector)

If everything is normal, you should get a voltage around 1.7v.

If the voltage is ~2.4V, solder 100 Ohm between pin 1 (LPC CLK) and ground (pin 8 or 10).

Solder 100 ohm resister between CLK and GND on connector LPC-CN1.

Power on and now we get our POST BEEP and LEDs are showing boot up procedure.

How Long Will this Fix Last?

"... some reported it works for years after the rework and some reported the system died after 6 months, so don't count this as a way to get a cheap NAS, as YMMV. I would recommend to turn it on only when you need to use it even if you don't have the problem currently or it works again after the rework. If you plan to buy used systems, look up the CPU first and avoid all these models, including the Synology."

References