Maxtor D740X-6L suddenly died, only LED blinks 5 times

[Rainbow]

Maxtor D740X-6L (Quantum-based) in my test system suddenly died. It does not spin up, activity LED on the PCB blinks 5 times (then pause and repeats). What does it mean? Flash corruption?

[fzabkar]

Have a look here:

https://www.acelab.ru/dep.pc/otherproducts.php

I believe this model has a UART port which outputs diagnostic information.

If you upload a photo of the PCB, I can help you identify the voltage test points, if necessary.

[fzabkar]

This might help (different model):

https://forum.hddguru.com/viewtopic.php?f=1&t=28367

[Rainbow]

Thanks. When it didn't work, I've checked some voltages - found 5V and 12V (of course), then 3.3V and something like 1.9V. Then I touched the RAM or CPU and it started to work. I've copied everything to another HDD. Now I have to wait until it fails again...

[fzabkar]

See page 26:

https://www.acelab.ru/dep.pc/doc.pc3000dos/060713.001/Quantum_EL-AS_v3.pdf

There appear to be two linear regulators -- 3.3V, 1.7V. There also appears to be a switchmode regulator, presumably to generate the -5V (?) supply for the preamp.

[Rainbow]

It failed again. And came back to life after touching RAM and power cycling. And failed again after a while as it heated up. Resoldered RAM and no more failures since then.