Nu-X MG300 Part

[chillrich]

Looking to replace damaged component but cannot find info when I search the labelling on IC. The part is in power supply section and is SO-223 or SO89 pkg labelled VT01. Board label is U18. I suspect it may be 3.3vdc regulator. Unit runs fine with the IC removed from circuit but is affected by small AC power variations like a refrigerator starting up etc.

https://drive.google.com/file/d/1G0yZdfUJzDOpfx37sE8e-5NY1kVqTwR5/view?usp=drivesdk
https://drive.google.com/file/d/1zzLcRRoz3TyqpY2_cGgb5Pm8pdWTYqyE/view?usp=drivesdk

[The Dude]

Find an IC on the board that use a 3.3V supply (using datasheets). Then, see if there is continuity from that IC's supply pin to any of the pads where that "regulator" solders onto the board. I suspect you are correct about it being a 3.3V regulator, but a little checking will verify.

[g1]

You could try contacting them. They most likely won't supply a schematic, but they might tell you what U18 part number is:

TECHNICAL SUPPORT AND GENERAL INQUIRIES( U.S. CONSUMERS ONLY)：
:
usa@cherubtechnology.com

[chillrich]

Great idea on the 3.3vcc tracing. Definitely give it a try. Contacted Nu-X and they wouldn't give any info. "Take it to an authorized repair center.

[Mick Bailey]

Contacted Nu-X and they wouldn't give any info.

No 'Right to Repair' there, then. A good reason not to buy their products.

[doctor]

This part is the TLV1117-50CDCY regulator.
Vout = +5.0V, Iout max = 800mA.
Package type: SOT-223. Marking code: VT

[chillrich]

Thanks Doctor, much appreciated

[chillrich]

A quick update to the repair. I found the Texas Instruments datasheet, code VT indicates 2.8VDC regulator. Ordered, installed and tested.

Thanks for pointing me in the right direction folks, much appreciated.

TLV1117LV28DCYT Marking VT

Link to TI page for these devices
https://www.ti.com/lit/ds/symlink/tl...lsrc%253Daw.ds