Qnap ts-119p ii nas- soic marking code identification | |||||
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| Excita 30/10/2014 02:58 |
Sorry, Im not Russian so I try it in English.
I have a broken qnap ya-119p ii nas with a damaged 8-pin dc-dc converter I guess. The marking is ABP0NB or ABPONB. Someone knows what this is??? Regards |
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| roges 30/10/2014 16:30 |
Excita, shall describe the alleged pinout |
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| Excita 31/10/2014 15:10 |
Hi,
I tryed to Write Out The schematic diagram. Seems to be as followed:  |
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| roges 31/10/2014 17:06 |
Hi!
Did you make a mistake, and the scheme looks like this ...!? 
See 3A, 12V, Synchronous-Rectified Buck Converter - with similar pin connections. -------------------------------------------- AOZ1010 AOZ1021 APW7142 |
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| Excita 31/10/2014 22:58 |
Yes, capacitor in parallel with resistor connects to outlet.
The Single cap is correct, between pin 5 and pin 7. Curious you cant identify The device via The marking code. Maybe i have to try on of The examples youve named. Best Regards |
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| roges 01/11/2014 22:40 |
Excita,
Judging because the board is present, Step Down Regulator -SY8009B, we can assume that the element with the code "ABP0NB" too, belongs Silergy Corp. Especially because they practice six figure encoding Package SO-8. However, this is only a guess, because the manufacturer is stingy on the documentation. 
Therefore, in the theme options have been proposed functional analogs with similar pin connections.
It remains to determine the output voltage of the regulator. To do this, you need to know the resistor values in the circuit FB, though, and so it is clear that it should not exceed the maximum input voltage for SY8009B - 5,5V |
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| Excita 02/11/2014 14:46 |
Hi Roges,
thanks for your help. R1 reads 100.1kOhm R2 reads 22.1kOhm Related to the Datasheets, the output voltage should be ~4,45V. I tryed 3,3V to the output of the Buck and the NAS seems to boot, (LEDs and fan working). I didnt tryed 4,45V, because for me i never heard of such a voltage in PC related stuff. Sadly I cant get the SY8142 / SY8143 datasheet or the pinout. Best regards |
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| roges 02/11/2014 20:20 |
Hi Excita !
This should not confuse you. Resistive divider circuit FB, you can select any output voltage of the regulator. In this case, it is necessary to proceed from an average value of the input voltage SY8009B, which will be 4,25V (+/- 5%)
Unfortunately, only that there offsayte. |
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| Excita 02/11/2014 22:05 |
Well, okay.
I ordered aoz1021 today, should arrive on Thusday. Hope I can get it back to work. |
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