Hi,

I have a WD HDD with PCB problem (it is not spinning up, no sound, nothing..) I Find a donor and i do pcb exhange but the disc spin up but not is show correct... show 0 MB and not present strange sound... what is the ROM in this PCB? or TVS problem? what is TVS in this PCB? i need desolder rom from bad pcb to good pcb (pcb are identical, firmware, head map, model, etc)

thank,

Carlos

The ROM is embedded in the MPU, the IC with the "M" on the top.

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Jono are right.

You have 2 option, but both needs special knowledge and tools.

- swap the U5 named component
- re-program it with special SW-HW complex.

Janos

thanks!!!

Carlos

I'm just an interested bystander, but why don't you at least measure some voltages? For example, there seem to be at least 4 test points for +3.3V and 1.2V. You may also want to confirm that +12V and +5V are present at the power connector.

As for the serial EEPROM, I'm wondering if that's what the unpopulated location at U12 is for, at least on those PCB versions where the EEPROM is external to U5. If so, can connecting an EEPROM reader/writer to these pins gain access to the internal EEPROM in U5?

U12 is of the type of memory 24xxx?

best regards,

Carlos

no,
25Pxx

pepe

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Adatmentés - Data recovery