LED driver flyback controller IC replacement

[ArticCynda]

Hi everyone,

I'd like to fix a burned out driver circuit for a 30W (15 x 2W) LED lamp, photographs of the charred chaos below:

It appears to be a fairly conventional flyback converter with 4 discrete diodes as rectifier bridge, 400V rated input cap, through hole flyback transformer on top and switching transistor with controller IC on bottom side, and a larger output capacitor.

It appears that the switching transistor and controller IC both burned out, and are missing parts of their package.

The part numbers are unreadable, and I am too unexperienced with power electronics to guess them. Could someone suggest a controller IC that might be suitable as replacement? The package is SOIC-8 I believe. And what kind of (N?) switching transistor or MOSFET should I choose?

Any help is more than welcome!

 

[ysba]

The FET's part number can be read. This is the datasheet: https://e-neon.ru/user_img/catalog_datasheets/svd4n60.pdf

I could not see quite about the controller. If you could take it and the transformer out of the PCB would be very helpful so we can see the PCB tracks.

 

[mtwieg]

There's no way the controller can be identified without at least deriving the full schematic and deducing the function of each pin. Even then it may be ambiguous. Some parts actually have info silkscreened on the bottom, maybe try looking there?

Also several of the resistors are clearly dead, along with the capacitor above the control IC. I would assume pretty much everything is broken.

 

[ArticCynda]

@ysba: you have really good eyes, thanks for the datasheet link! This part is really hard to source, may I assume that any 600V N-MOS with a 4A current rating and a compatible pinout can be used?

It's a double layer board so I'll do my best to reverse engineer it back to a schematic.

Thanks for the help!