Need help identifiying a component

[Rick]

The following picture shows what I believe is an LED driver chip (because it is in an LED bulb circuit). However I could not find that SMT code ("GB1T" or may be "G81T") in any SMT code list online.
Could you please give a URL where it is included in a list of codes or better, if you know what it is, tell which particular component it is.

Thank you.

[ataradov]

If you search for "gb1t sot23-6", you will find a couple links like https://www.makuwang.com/search/xq?id=8902-GB1T.html and http://blog.sina.com.cn/s/blog_a377c9720101fho3.html . Based on this it looks like this is a very custom/obscure LED driver chip.

[fzabkar]

Could we see the whole PCB?

Have you traced out the chip's pins, eg ground, Vcc?

[coromonadalix]

Seems to be this part

ASML-5828    SOT323    limiter series pin/schottky pair, D1 pin, D2 sch

[amyk]

LNK4012S ? Is there a transformer on the board?

[Rick]

Could we see the whole PCB?

Have you traced out the chip's pins, eg ground, Vcc?

I have not yet but I shall do soon as there is no schematic.
As there is a transformer and a N channel MOSFET I think this is some sort of flyback converter and an LED driver is used in these designs, and the only chip with at least 3 pins is this one with the MOSFET that I could identify clearly.

[Rick]

This is the other side of the PCB.

[Rick]

Seems to be this part

ASML-5828    SOT323    limiter series pin/schottky pair, D1 pin, D2 sch

There is a 4th character at the end of the code and it is a 6 pin package not 3. So I think it is different.

[amyk]

Looks like LNK4012S may be a good match, this is an isolated (or attempt to be) PSU.

[Rick]

Looks like LNK4012S may be a good match, this is an isolated (or attempt to be) PSU.

Somebody sent me the following file. But the name does not match either...

[Rick]

Thank you.