Help repairing pcb

[royaldsouza1]

i have a wd digital hardisk. Whenever i connect the drive to the power supply. The supply is turned off. Most probably the tvs diode is shorted. I will be uploading the pic of the pcb. Can some one identify the TV diode, fuses, 0 OHM resitor.

[fzabkar]

I can't see anything that looks like a TVS diode, but I would start by measuring the resistance between ground and each pin of Q6. I'm assuming that powering up the board on its own is enough to shut down the supply.

[data-medics]

If your aim is to get the data back, you can just transfer the U12 chip to another PCB of the same number and it should work.

[marcel86]

royaldsouza1, I can’t really see any visible issue from this distance in a picture but you will really have to check resistance to each pin of Q6 as mentioned. It’ll help you determine if the diode has been permanently damaged since you’ll get a comparatively small resistance somewhere where you’ll need infinite or near infinite resistance. Also, you can compare these values with a working board if need be.

Regards,
Marcel J.