No TVS Diode on old hard drives (IDE)

[duck22]

Hi

I have a hard drive that does not power on.
There is power coming in. I know I can replace the whole PCB but I was wondering is there anything similar to the TVS diode I can check.
All I see on the PCB are lots of capacitors and a couple of transistors


I have looked at a few old hard drives mainly IDE and cannot find any diodes on them.
I hope some one can advise.

Thanks in advance

[HaQue]

post a good quality picture of the PCB would be my advice to start with.

[chinopk]

yes, post picture so someone can point you to the right direction.

[duck22]

I have attached photos that I have got through google images
I have two drives that do not have tvs diodes
deskstar 40gb and maxtor maxline ii 320 gb

Attachments

pcb1.JPG (19.26 KiB) Viewed 10614 times

[duck22]

Sorry forgot to attach photos of the Maxtor pcb. I will do that shortly
Can anyone help with the Hitachi pcb please

I can't see any diodes or fuses. Just transistors and capacitors.

[HaQue]

any reason you cant post photos of your actual boards? those pictures really don't come up big enough. for example, pictures in this post are good(for reference) http://forum.hddguru.com/viewtopic.php?f=1&t=32050

fuses or fusible links can be labelled on silkscreen of pcb with component numbers starting with L, resistors with a "0" on them and components labelled with an "F" are all things that may be worth looking for(test continuity).

[duck22]

Thanks for the help
I cannot find any fuses or fusible links

I have uploaded some better images
I do not have access to a camera at the moment

can some one advise on what points to test or to determine which components are faulty please

Attachments

[duck22]

Hi
attached is image of the maxtor drive
when plugged in has power but doesnt spin up but used to

no diodes

Attachments