Component identification and/or datasheet, please

[double_DD]

Hi all

I have Synology DS115j that I'm trying to repair.
I've found a short between G and S on Q13, but it's not on mosfet (when I unsolder it). So I suppose problem might be on mosfet driver - I believe U10 is the driver for 2 surrounding mosfets.

However, I'm not sure exactly what U10 is, so I cannot find the datasheet. (might be uPI semiconductors, but I cannot find anything on their page)

Any help is welcome, thanks!

[truclacicr]

I see references to uP1504TSU8, so this is consistent with uPI Semiconductor Corp parts.

Example datasheet for uP1514RSU8 (PSOP-8L) and uP1514RSA8 (SOP-8L):

https://www.alldatasheet.com/datashe...P1514RSU8.html

ISTM that your IC is a buck controller (because there is an inductor nearby), possibly with the same pinout as the uP1514RSU8.

[double_DD]

Thanks for the help.

Although I'm not sure if pinout is the same, as 1514 has high mosfet gate on pin2 (according to your document), while on my board it seems that high mosfet gate goes to pin8? 😕
Weird part is, I can find uP1504 chips on Aliexpress, but I'm not able to find any datasheet for it.

[truclacicr]

It could be a custom part.

This reviewer wasn't able to find a datasheet, either:

https://www.insidegadgets.com/2016/1...-dual-bay-nas/

[double_DD]

Yep, this power input part of the board looks very similar if not identical to mine.

So, if I understand correctly, I basically have 3 options: try my luck with Aliexpress chip; bypass this part of the board with "external" 5V buck converter; or just bin the damn thing.

[truclacicr]

Often a manufacturer will use two or more sources for the same part. However, all the photos I've seen show the same UPI IC. An external buck converter might be the safest option.

[double_DD]

Thank you for all your effort.

The only problem I can see with using external buck converter, is then that power supply (and probably something powered by it) will be always on -I suppose internal PS is somehow connected to power button- but, then again, it's only a problem when device is plugged in but not switched on, which for a NAS shouldn't be that often.

[truclacicr]

You need to find the enable pin and tie that into the circuit. Then the circuit will switch on the external module when required.

[double_DD]

Yeah, the cheapest ones that I bought a couple (for 12V) don't have that pin. I'll have to splurge and buy the second-cheapest option.