Need help indentify burnt out component

Thread Starter

masterasp

Joined Jun 15, 2022
2
Hi,
please help me identify these burnt out components from Xiaomi FIVE Smart Sterilization Lamp
47n608.jpg
(U1 and R2)IMG_20220615_224531~2.jpg

IMG_20220615_224336.jpgIMG_20220615_224506.jpgIMG_20220615_224520.jpgIMG_20220615_224531.jpg


All help greatly appreciated. Thank you.
 

Ya’akov

Joined Jan 27, 2019
6,036
Welcome to AAC.

Most unfortunately, without a schematic the only thing I can tell you is that U1 is a transistor with mains voltage on one side and low voltage on the other almost certainly a MOSFET, part of a switch mode power supply; and the R2 is a resistor apparently in the same circuit.

The lack of markings makes anything further from the photos impossible. Wish I could help more.
 

Irving

Joined Jan 30, 2016
2,794
With the amount of damage apparent on that board, the chances of repair are minimal - its almost a certainty there will be other compromised components that have, or will, fail. You need to be aware not only of what failed but why, lest you fall into a rabbit hole....
 

seanstevens

Joined Sep 22, 2009
147
Considering DB1 top left is a bridge, I would expect U1 is one of these NON-ISOLATED OFF-LINE REGULATOR. They work ok when they do, but when they fail, they fail big time and burn everything around them. I agree with @Irving, most likely many things have failed or majorly stressed but may not look cracked, burnt or have hole in them. Chances of a successful repair is minimal and possibly short lived.
Also, be very careful as at least parts of this circuit looks non isolated meaning you are in danger of electric shock or worse as are any scope or test gear that is mans driven and earthed.
 
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