Identifying component Flyback? DC-DC?

[unimatrix93]

Can I ask you guys help me identify this godforsaken component?

I'm tearing my hair out finding this component.

The board is from an egg incubator.
i got it with a "popped cap" while there are many damaged components on it, which got succesfully identified with one exception:

And here is the board where it came from (U1/1):


As you can see, the IC is badly damaged. Only a few characters are visible and a unknown by me manufacturer logo. Also it has 3 pin on the top side.
Can you please help me find out what is it?

[truclacicr]

The manufacturer is Crystal Source Microelectronics.

Datasheet for CSC7136D:

https://dfsimg2.hqewimg.com/group1/M...vXAKmCs236.pdf

[truclacicr]

Try reposting your question here:

https://www.eevblog.com/forum/repair/

[petehall347]

st micro

[redwire]

Why go to eevblog, they are a cranky bunch over there.
These IC's are in-country copies of real parts. It's not ST, it could be "SC" or "STC" the S is for Shenzhen. Most SOP-7's have pin 3 missing but here it is pin 7 which narrows it down.
Looking at the circuit, closest IC PN8370SSC matches pinout and primary-side voltage sensing but it's too much at 18W.
OP's board the sense-resistor on pin 4 is also blown.

[truclacicr]

PN8366 is rated for 6W loads:

[truclacicr]

I hate this forum's software.

I hope this URL works:

https://voltatech.ir/wp-content/uploads/2021/11/آی-سی-PN8366-پکیج-SMD.pdf (PN8366, 6W)

https://radioremont.com/wa-data/publ...nts/PN8360.pdf (PN8360, 12W)

[R_J]

It could be this, CSC7136D seems to be the same pinout as the pn8360

[truclacicr]

The manufacturer is Crystal Source Microelectronics.

Datasheet for CSC7136D:

https://dfsimg2.hqewimg.com/group1/M...vXAKmCs236.pdf

[unimatrix93]

Thank you everyone for helping me out!
You are the best. 🤘

I was pulling my hair out identifiying this exploded sh˙t.

[redwire]

What about the blown sense-resistor at pin 4? Maybe "2R2" marking? gives 227mApk I think.

[unimatrix93]

What about the blown sense-resistor at pin 4? Maybe "2R2" marking? gives 227mApk I think.

Yes, its a 2K2.
Also have to replace:
- 2KV keramic 1nF cap.
- B1000S05 bridge rectifier
- 450V/6.8uF capactior
- An unkown cap next to it
- A BT131-600
- A microswitch
- And repair some track.

[R_J]

That resistor from CS to ground is likely a 2R2 (2.2Ω) resistor, not a 2K2 (2.2KΩ)
If the unknown cap is the vcc capacitor off D9, it is likely around 47µf/50v

[redwire]

Does it have a fuse anywhere? I would add one.
Or for all the blown parts from the power surge, consider just using another small DC power supply feeding this control board. It must output 5 or 9 or 12V at most 1A.
The triac is for the turntable motor? No light or heater?

[R_J]

The fuse is next to the plug in the heatshrink

[redwire]

What pic is that in? I can't see any heatshrink in the posted pics.

[CapLeaker]

redwire I think RJ means the first post second picture, very last plug on the bottom. Below it there is black something.

[petehall347]

this was a fuse .

[redwire]

Melted copper traces, but nothing looking like an arc happened thought it should be black. Oh wait the trace she gone.
I have issues with cheap chinese power supplies having no fuse, how do we allow this junk into our countries.

[unimatrix93]

So after the IC arrived from China I repaired the damaged traces and proceeded to install the IC.

The test resulted in a glorious explosion and the 2R2 resistor blew up also burning off the metal side of the ceramic capactor. The bridgerectifier (B1000S05) and the fuse (250V/10A) also died.

The explosion happened after holding down the power button for a few seconds.

What could cause this issue? I did not connect the other parts to the PCB like the motor and fan, only the main AC.