I have purchased a lenovo m720q without CPU, Ram or an SSD for 10 euros. Thought I scored a good deal since I had some of those 3 parts or got them super cheaply. With the purpose of turning into a home server afterwards.
The issue I started having is "error 0135 CPU fan failure". The fan is just running at 100% and being extremely loud. I thought the fan was broken since the BIOS update and clearing CMOS did not help solve this issue. I ordered a fan. It did not fix the issue.
I ran the lenovo diagnostics app and it says there is no CPU fan detected. Which I found strange since I can hear the fan screaming.
I dreaded it being a hardware fault, but there does not seem to be any blown capacitors on the board and the fan header seems to be getting power. I soldered a laptop fan onto the cable and then connected it to the pins. The fan just goes at 100% like the OEM one.
For the Mobo, I only performed a visual check since I assume a blown capacitor would look differently. I unfortunately don't have the patience or time to trace the entire route of the cpu fan header.
I am very much stumped by this issue and was wondering if anybody else encountered something similar?
To be noted I tried different rams (took out the kit from my laptop), right now i have a 32gb kit and the CPU is a i3 9100t. Based on the serial number, it originally came with a i5 8400t.
I thought of getting a new motherboard, but they seem to be quite expensive. I am not sure what other alternative I have, but I'd like to keep the budget as low as possible since HDDs are also going through the roof now.
I am currently running Ubuntu Server on it, but did not configure any programs since it is my first home server and the fan is too run it 24/7 once set up.