Hi,
I have a defective drive Samsung HD642JJ rev A, 16M with controller board Trinity R006M rev05, BF41-00184B. See photo.
When powered up, the drive does absolutely nothing, no clicks, remains ice cold -> seemingly draws no power. There was no incident, it just failed at power-up. No visible traces of damage.
I already took following steps for diagnosis:
- Measured TVS and 0 ohm resistor, all OK
- Measured voltages at several points on the board. Both 5V and 12V are present
- Measured voltages at the DC/DC converter coils as explained by fzabkar. Voltages are way too low (only a fraction of a volt)
My conclusion is that the motor control chip (TI SH6125B) must be defective. However cannot find the pinout diagram of this chip, so I have no means to verify.
The TI chip has extremely tightly spaced pins. Replacing it requires specialized tools that I don't have. Also it may be another component that fails. Would it be better to swap the whole board?
Before ordering a replacement board I'd like to know if a board swap is sufficient.
Seems like most boards are unique to their drive. Anyone who knows about the Trinity boards?
Thanks in advance,
Paul
Picture of board:
I have a defective drive Samsung HD642JJ rev A, 16M with controller board Trinity R006M rev05, BF41-00184B. See photo.
When powered up, the drive does absolutely nothing, no clicks, remains ice cold -> seemingly draws no power. There was no incident, it just failed at power-up. No visible traces of damage.
I already took following steps for diagnosis:
- Measured TVS and 0 ohm resistor, all OK
- Measured voltages at several points on the board. Both 5V and 12V are present
- Measured voltages at the DC/DC converter coils as explained by fzabkar. Voltages are way too low (only a fraction of a volt)
My conclusion is that the motor control chip (TI SH6125B) must be defective. However cannot find the pinout diagram of this chip, so I have no means to verify.
The TI chip has extremely tightly spaced pins. Replacing it requires specialized tools that I don't have. Also it may be another component that fails. Would it be better to swap the whole board?
Before ordering a replacement board I'd like to know if a board swap is sufficient.
Seems like most boards are unique to their drive. Anyone who knows about the Trinity boards?
Thanks in advance,
Paul
Picture of board: