Another Samsung HD322GJ Problem

[mikail13]

i recovered app 10 HD322GJ that all of PCB faulty

it doesn't spin. And there is no visible error on PCB.

TVS's O.K.

What should I suspect part?

Attachments

[mikail13]

Thanks for reply.

i desolder rom chip from faulty pcb as you can see...
i recovered disks via rom transfer. Disk spins normally.

i 've five HD322GJ that needs pcb for this common problem...

Maybe main chip or easy problem?

[fzabkar]

Measure the Vcore, Vio and Vneg voltages:

http://www.users.on.net/~fzabkar/HDD/HD103SJ_regs.jpg

[mikail13]

Measure the Vcore, Vio and Vneg voltages:

http://www.users.on.net/~fzabkar/HDD/HD103SJ_regs.jpg

thanx for reply.

i have 3 broken boards of hd322gj.

at diode mod

vio(up) vio (down) Vneg

A 0,646V 0,082V 0,180V

B 0,635V 0,068V 0.180V

C 0,685V 0,108V 0,190V

[fzabkar]

bad motor controllers

[gps31]

ok what are the expected value?

[fzabkar]

2.5v, 1.2v (?) and -5v

confirm 12v and 5v at diodes

[Amarbir[CDR-Labs]]

Well,
Sometimes The Zero Ohm Resistor in Series From Main Supply is Open ,Please Check That Too ,Very Common In These PCB 's

[pepe]

he probably measured voltages without supply, in diode mode across the tvses, so it is not very meaningful

at diode mod

vio(up) vio (down) Vneg

A 0,646V 0,082V 0,180V

B 0,635V 0,068V 0.180V

C 0,685V 0,108V 0,190V