Samsung - common PCB problem

[laptokowiec]

I receive many Samsung drives with dead pcb.
Usually transil diodes or 0 ohm resistors are ok.
Whats their Achilles heel from your experience ?

[dmarques]

I would say users

[laptokowiec]

excluding users influence ?

[dmarques]

I think that's very hard to say, because that might be due to problems on the electric installations of buildings, on the computers PSU's and might not be even a big issue with the drives itself.
That's why I think that's really hard to say.

[fzabkar]

A quick check of the onboard power supplies should take 2 minutes. That should tell you whether the motor controller is at least partially functional.

[laptokowiec]

In all cases only pcb is damaged

[longlife]

A quick check of the onboard power supplies should take 2 minutes. That should tell you whether the motor controller is at least partially functional.

Boss, FZABKAR

would u please please & please explain how to do it.

If you explain thousands of uses will be benefited.

advanced thanx.

[BlackST]

I receive many Samsung drives with dead pcb.
Usually transil diodes or 0 ohm resistors are ok.
Whats their Achilles heel from your experience ?

70% user 30% seems fatality.
P.s. In thousands seen for recovery / refurb no more than 10 had TVS problems.

[fzabkar]

Tutorial - how to locate the basic test points of an unfamiliar HDD PCB:
http://www.users.on.net/~fzabkar/HDD/Tu ... 0411N.html

HDD TVS diode FAQ:
http://www.users.on.net/~fzabkar/HDD/TVS_diode_FAQ.html

Tutorial - Linear and Switchmode Regulators used in HDDs:
http://malthus.zapto.org/viewtopic.php?f=59&t=231&p=597

@longlife, if you have a specific PCB, I can show you what and where to measure.