Hi there,

I have a Samsung HD103SJ here that spits out the following (at 57600bps):

*PA VID=0000 PN=0004 Rev=0002- 785x Found
*PA VID=0000 PN=0004 Rev=0002- 785x Found
ChipRev = 63B0
U
S_0
[DEBUG HALT @MDL_RSRC_BufferAlloc():10034A95 L0 1003A451]
RV En Sensor Circuit
En Shock Sensor Circuit

No spinning, the switching regulator supplying the head amp (+5v - P-ch mosfet - 1.2uH choke) is not working.
I'd assume it's stuck in a very early stage of bootstrapping so it may be normal that the regulator does not get drive.

How adaptive are the ROM contents? I can surely do a PCB swap, but the problem may well be in the flash ROM data...

Should not be a problem....but can be.
Anyhow if you have an working pcb from the same drivefamily you can make a swap see if it spins up as it should.

_________________
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I'll give it a try. It's probably not worth to invest more work

It does not spin up - the fault is very likely to be in the flash eeprom contents. I've cross swapped the boards, the disk having the original eeprom won't start and shows the

*PA VID=0000 PN=0004 Rev=0002- 785x Found
*PA VID=0000 PN=0004 Rev=0002- 785x Found
ChipRev = 63B0
U
S_0
[DEBUG HALT @MDL_RSRC_BufferAlloc():10034A95 L0 1003A451]
RV En Sensor Circuit
En Shock Sensor Circuit

on the terminal