Data recovery and disk repair questions and discussions related to old-fashioned SATA, SAS, SCSI, IDE, MFM hard drives - any type of storage device that has moving parts
June 7th, 2021, 4:46
I have a desktop hard disk of we 500gb internal. One day, I started my pc, it was showing to select a boot drive, no hard disk was detected. And also no spinning sound or vibration is comming from it.
I have already checked the TV's diodes, no burnt on circuit board of hdd.
Please help me. I don't want to lose my data.
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- WD PCB board
June 7th, 2021, 5:00
Isolate the 20-pin connector, leave the motor contacts. If the engine starts. The switchboard or heads died. If it doesn't start, change the board.
June 7th, 2021, 5:05
How to isolate 20 pin connector
June 7th, 2021, 5:50
Tape or thin card like a business card.
... and whilst you're at it give the connectors a clean off and check the 0 ohm resistors around power in.
June 7th, 2021, 5:56
I have done this already...all things are working and fine....but don't know what's the problem
June 7th, 2021, 5:57
Is there any way to check voltages using multimeter...on what points should I check voltages on pcb
June 7th, 2021, 6:22
I'm curious to know why you're asking where to check if all things are working and fine.
You can start with continuity on the diode D1 & D2 and then look at L1 & L2 any caps shorted to ground. What's the drive model number and PCB number. I don't think members mind helping but we can't do it for you.
June 7th, 2021, 6:26
pvprashant1803 wrote:I have done this already...all things are working and fine....but don't know what's the problem
if the motor is spinning with isolation of switch heads. so the problem is in the hermoblock, you need to change the heads.
June 7th, 2021, 8:23
I already mentioned that the motor is not spinning even after isolation of 20 pins
Model no. is wd5000aakx.
PCB board is 2060-771640-003 rev A.
June 7th, 2021, 8:55
Replace the entire PCB with Identical one and transfer U12 from patient to donor.
June 7th, 2021, 9:35
unknown wrote:Replace the entire PCB with Identical one and transfer U12 from patient to donor.
I want to repair this one....please try to solve this
June 7th, 2021, 14:18
Measure the 3 voltages (V1, V2, Vneg).
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June 7th, 2021, 15:29
From a working PCB for info.
V1 : 1.10
V2 : 2.57
V- : 0.08
In terms I can understand - that is to say very simple
is there a reason to measure the values on the caps and not the inductors themselves, other than ease of access ?
June 7th, 2021, 15:36
Lardman wrote:From a working PCB for info.
V1 : 1.10
V2 : 2.57
V- : 0.08
In terms I can understand - that is to say very simple :) is there a reason to measure the values on the caps and not the inductors themselves, other than ease of access ?
V- is probably 0 because the firmware switches off this supply if it doesn't detect a preamp.
I use the inductor as a test point just because I cannot always tell which capacitor is connected to it. In general I would use the least "busy" test point to minimise the risk of damage if the probe were to slip off.
June 8th, 2021, 3:33
fzabkar wrote:Measure the 3 voltages (V1, V2, Vneg).
I got these values
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June 8th, 2021, 3:43
What are the output voltage at these points?
I am getting 0V, 0.14v at all 4 pins
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June 8th, 2021, 3:46
Also, it is showing zero continuity value from ground to these 4 pins.
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June 8th, 2021, 3:48
I was just about to ask you to check there you should be getting around 6v. track the voltage back to the motor controller there looks like liquid damage to the pcb in that area.
June 8th, 2021, 4:07
Lardman wrote:I was just about to ask you to check there you should be getting around 6v. track the voltage back to the motor controller there looks like liquid damage to the pcb in that area.
No there is no liquid damage.
June 8th, 2021, 4:16
This level of corrosion is not normal. That should be a nice clean copper ground pad.
- not_normal.PNG (217.23 KiB) Viewed 17265 times
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