Thanks stroker.
Resistance between 5v and GND I’ve measured both at the female part of the output plug, and from the blobs of solder on the underside. Unfortunately, I cannot check directly with the HDD output because it, and the output plug is soldered in to the PCB – you can’t pull it out to get to any header pins. Tonight it’s still giving me 96 ohms.
Between 3v3 and GND, I don’t get a stable reading to J15 nor to the output wire. It may start at around 800Ohms then steadily rise, may give a flash to a few MOhms or OL, and then come back to around 8kOhms. On the underside it did stabilise at around 860 ohms. Incidentally the SATA power cable does not carry 3.3v – only has four wires. So actually there are two 12v and two 5v connectors to the main board, one via the long plug and one via the SATA cable direct to the HDD. Also I had previously checked that I had 12v at the output end, but not 5v nor 3.3v.
Looking at IC 41 there are only three pins on the underside, the middle one being GND. No short to either of the others.
All the checks I’ve done when powered up were with and without the main board connected and with and without the front board connected.
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