I'm trying to trouble shoot PCB issue on this Maxtor DiamondMax Plus 9 120GB... Drive is not spinning up at all, no power. I think there is a short on the PCB. I've taken readings with multi-meter in diode mode as shown below, measurements are in uF...
Maxtor DiamondMax Plus 9 120GB PCB Issue No Power
- CrazyTeeka
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Re: Maxtor DiamondMax Plus 9 120GB PCB Issue No Power
That was an era of drive where the Smooth MCU chip would frequently fry. I tend to swap the board, if I can, just to avoid the rabbit trail.
I'm got a bunch of cases to keep my busy right now, but will see if I can find a working board on our shelf to compare readings.
I'm got a bunch of cases to keep my busy right now, but will see if I can find a working board on our shelf to compare readings.
Re: Maxtor DiamondMax Plus 9 120GB PCB Issue No Power
This doesn't make sense. uF is a unit of capacitance.CrazyTeeka wrote: ↑Tue Nov 28, 2023 4:53 pmI've taken readings with multi-meter in diode mode as shown below, measurements are in uF...
I would identify the power supplies and measure the resistance between output and ground, or measure the voltages.
Q501 (near 4-pin Molex connector) appears to be the pass transistor in a linear regulator.
VR400 (near SATA power) is an LDO regulator.
VR300 (between SDRAM and MCU) appears to be another pass transistor in a linear regulator.
The anode of the diode in Q500 would be the -5V (?) supply for the preamp.
Datasheet for BA18BC0 (VR400, 1.8V LDO):
https://www.farnell.com/datasheets/2100306.pdf
Datasheet for 2SD1758 (Q501, NPN transistor):
https://www.mouser.com/datasheet/2/348/ ... 201467.pdf
... or FJD3076 (Q501, NPN transistor):
https://www.mouser.com/datasheet/2/308/ ... 123972.pdf
Datasheet for FSS139 (VR300, P-channel MOSFET):
https://digchip.com/datasheets/download ... ber=FSS139
Datasheet for FW503 (Q500, MOSFET + diode):
http://datasheet.digchip.com/413/413-3502-FW503.pdf
Your PCB may have different ICs, but they would be functionally equivalent.
Other photos:
https://cdn10.bigcommerce.com/s-9c16le9 ... 80.JPG?c=2
https://datarecoverydonors.com/cdn/shop ... 1619636581
https://ae01.alicdn.com/kf/S6e61a994c9f ... pal-IC.jpg
- CrazyTeeka
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Re: Maxtor DiamondMax Plus 9 120GB PCB Issue No Power
I know I can figure this out, with a little hand holding. I checked the resistances (Ohms) from different points to ground. Does this help identify where the problem is?
- CrazyTeeka
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Re: Maxtor DiamondMax Plus 9 120GB PCB Issue No Power
Well as far as I can tell there appears to be a problem around the Q500 area.
Re: Maxtor DiamondMax Plus 9 120GB PCB Issue No Power
If you really are measuring 8.6 ohms and 12.9 ohms at the power connector, then something is seriously wrong right there.
- CrazyTeeka
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Re: Maxtor DiamondMax Plus 9 120GB PCB Issue No Power
The readings are correct so something is defiantly wrong with this PCB. What should the readings look like on a working PCB?
I could measure the resistances across each component instead of over the circuit. If that helps?
Re: Maxtor DiamondMax Plus 9 120GB PCB Issue No Power
The L7250 motor controller is powered from both 12V and 5V supplies.
https://pdf.dzsc.com/L72/L7250.pdf
If this chip is responsible for your low readings, then it would be cooking.
https://pdf.dzsc.com/L72/L7250.pdf
If this chip is responsible for your low readings, then it would be cooking.
- CrazyTeeka
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Re: Maxtor DiamondMax Plus 9 120GB PCB Issue No Power
Found problem area, many things appear to have blown...
Re: Maxtor DiamondMax Plus 9 120GB PCB Issue No Power
Seems like you are narrowing in on the Smooth MCU that I mentioned previously.