Help with parts identification - Celestron Microscope repair

[NickFolino]

I'm trying to repair a Celestron Microscope.  I believe someone plugged in the wrong power supply and damaged 2 components.  Pictures attached.  Any idea what these parts are?  Any help would be greatly appreciated!

Nick

[fzabkar]

The marking isn't exactly the same, but it's very similar (WS-nnn or WS=nnn):

Richtek, RT8008, 1.5MHz, 600mA, High Efficiency PWM Step-Down DC/DC Converter, 2.5V - 5.5Vin, SOT23-5:
https://www.richtek.com/assets/product_file/RT8008/DS8008-07.pdf

https://www.google.com/search?q=rt8008&tbs=isz:m,itp:photo&tbm=isch
https://www.google.com/search?q=ws+sot23-5&tbs=isz:m,itp:photo&tbm=isch

If you could provide a full photo, that would enable us to see the parts in context.


WS- is RT8008PB (Lead free)
WS= is RT8008GB (Green)

http://www.smdmark.com/en-US/search/code?id=ws-
http://www.smdmark.com/en-US/search/code?id=ws=

[NickFolino]

Thanks!  Here's the circuit.  5VDC comes in at the connector on the left. U5 and U22 are the damaged components I'm trying to identify.

Nick

[fzabkar]

Assuming RT8008 is the correct part, and if R11 and R12 are 30D (200kohm) and 01D (100kohm), respectively, then the output voltage of U22, when measured at L4, would be 1.8V.

The part marked DE= appears to be a 3.3V LDO regulator.

RT9193-33GB, Richtek, 300mA, 3.3V, Ultra-Low Noise, Ultra-Fast CMOS LDO Regulator, marking DE=, SOT23-5:
https://datasheet.octopart.com/RT9193-33GB-Richtek-datasheet-12517944.pdf

http://www.smdmark.com/en-US/search/code?id=de%3D

I can't identify U5, but I'm wondering if it is another LDO regulator. I would identify the larger ICs and determine what supply voltages they require. The A106 capacitors appear to be the filters on the Vins and Vouts.


Edit:

Could U5 be a TC1014-2.5VCT713? That's a 2.5V LDO regulator.

TC1014-2.5VCT713, Microchip, 2.5V, 50mA, CMOS LDOs with Shutdown and Reference Bypass, marking A1xx, SOT23-5:
https://ww1.microchip.com/downloads/en/DeviceDoc/21335e.pdf

[NickFolino]

Yes, fzabkar.  I think that's it!

How did you find these?

Nick

[fzabkar]

http://www.smdmark.com/en-US/search/code?id=a1xx