Hi

I have a Hitachi HDT721010SLA360 Disk. When powered on not spinning up and silent.

PC3000 shows all registers red and bsy

Please find the attached pics.

What cud be the likely issue with this drive ?

very likely bad pcb.

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Could be bad heads as well...

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If bad heads will it cause no spin?

Ive seen this on SLA models...

Isolate pcb and see if it spins. Could be burnt out motor.

Sorry, but this makes no sense.

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I think Bad PCB, you need donnor PCB.

It could be bad PCB, sometime it's bad head.

If you have SD SATA TO IDE converter then you can see if 2 LEDs are on or off. If 1 is on, another 1 is off. Then it's PCB.

If both LEDs are on, then it's internal damage.

Isolate PCB from HDA, you can also confirm.

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Isolate pcb from hda. Now it makes sense ?

By all means, do what you have suggested.

However, from what the other professionals are saying, it would appear that isolating the preamp on a good drive may prevent it from spinning up, presumably because the MCU may need to detect the preamp. Therefore, if they are correct, and if the drive does spin up after isolating the preamp, this would point to a burnt out preamp. If it doesn't spin up, then we wouldn't know whether the motor or preamp were at fault, or whether the fault was somewhere else.

If I were testing for a bad motor or preamp, I would use a multimeter to test the motor windings and the resistance on the preamp's negative supply.

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A backup a day keeps DR away.