I’m trying to repair a Sonoff 4CH Pro R3 that was damaged after a failure in the AC power supply.
The board works normally when powered from the 9V DC input, but it is completely dead when powered from 120V AC.
The power supply IC (U1) is burned, and unfortunately the part number is no longer readable.
Would anyone happen to have the same board and be willing to take a close-up, high-resolution photo of the U1 area, or tell me the exact part number printed on the IC?
Any photos or information would be greatly appreciated. Thanks!
I know this is not your board, it is the 4ch r3 but has the same power supply on the AC side as the 4ch pro r3. Same parts but capacitors and resistors in different positions. U1 is the same on both as I had U1 blow on my 4ch pro and had this to look at and was able to fix it with LP3669. Hope this helps!
