thank you,Welcome to AAC!
There's little chance that a member is going to be able to be familiar enough with the device you mention, so schematics, model numbers (Google didn't return anything useful for SM-04-HSC in the first dozen hits), close ups of suspect components, and a thorough description of the problem are required.
EDIT: Add clipped, rotated image.
- Was the device in operation when it got wet?
- If it wasn't, was it allowed to dry completely before applying power?
- What does stopped working mean? Did it stop working completely? Are parts of it still functional?
- What are your skills for working with surface mount components?
View attachment 207603
No. Most important parts can't be tested with a multimeter and testing in-circuit isn't straightforward. You can check transistor junctions and diodes, sometimes.by saying parts still functional, does using a multimeter is required to verify every part of it?
If the forward voltage is low enough, you can use the diode checker on a DVM.and how can i test the led are working or not?
If you can work on smartphones, your skills must be pretty good. Small parts and easily damaged boards.- my skills with surface mount components is limited to soldering and repairing smartphones.
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