February 16th, 2018, 8:59
February 16th, 2018, 16:23
February 17th, 2018, 6:18
pcimage wrote:On this device, it’s much more likely that it’s suffering from firmware damage and/or flash degradation than an actual electronic fault.
February 17th, 2018, 17:15
February 18th, 2018, 9:24
February 18th, 2018, 14:21
fzabkar wrote:TPS22903, Texas Instruments, marking 4P, 3.6V, 0.5A, 68mOhm, Load Switch:
http://www.ti.com/lit/ds/symlink/tps22904.pdf
February 18th, 2018, 15:01
February 18th, 2018, 16:26
fzabkar wrote:I doubt there is any hardware fault, but just to be sure ...
As expected, the TVL62090 voltages are correct. The differences reflect the different output voltages - one converter produces 1.0V, the other 3.3V.
The TPS22903 is that tiny component near the SATA connector.
These voltages look wrong:
February 18th, 2018, 17:07
February 19th, 2018, 4:24
fzabkar wrote:Could you measure the voltages at the other "T6" component? Could you also test the B-E and B-C junctions on the diode range of your meter? Do they test like diodes?
Could you measure the resistance of the "0V capacitor"? Is it shorted?
February 19th, 2018, 17:25
February 20th, 2018, 5:16
fzabkar wrote:I'm trying to determine whether T6 is an NPN BJT, or NPN digital transistor, or an n-channel enhancement mode FET. It's not testing like any of them.
Can you measure the voltages at the circled test points in the previous image?
I'm also trying to determine whether the capacitor (?) at the bottom left corner of the next image is shorted. What is its resistance?
February 20th, 2018, 15:58
February 20th, 2018, 16:25
fzabkar wrote:Sorry, I can't identify T6. However, ISTM that it is doing its job which is to enable the adjacent regulator. I don't believe there is a hardware problem.
February 21st, 2018, 2:15
February 21st, 2018, 2:30
February 21st, 2018, 3:38
February 21st, 2018, 14:57
February 21st, 2018, 15:56
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