Author Topic: Need help identifiying a component  (Read 559 times)

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Offline Rick

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Need help identifiying a component
« on: October 30, 2019, 06:17:50 pm »
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.
« Last Edit: October 30, 2019, 07:25:45 pm by Rick »
 

Offline ataradov

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Re: Need help identifiying a component
« Reply #1 on: October 30, 2019, 08:29:17 pm »
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.
Alex
 

Offline fzabkar

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Re: Need help identifiying a component
« Reply #2 on: October 30, 2019, 09:13:25 pm »
Could we see the whole PCB?

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

Online coromonadalix

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Re: Need help identifiying a component
« Reply #3 on: October 31, 2019, 01:20:29 am »
Seems to be this part ???

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

Offline amyk

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Re: Need help identifiying a component
« Reply #4 on: October 31, 2019, 02:20:57 am »
LNK4012S ? Is there a transformer on the board?
 

Offline Rick

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Re: Need help identifiying a component
« Reply #5 on: October 31, 2019, 02:43:17 am »
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.
 

Offline Rick

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Re: Need help identifiying a component
« Reply #6 on: October 31, 2019, 02:49:18 am »
This is the other side of the PCB.

 

Offline Rick

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Re: Need help identifiying a component
« Reply #7 on: October 31, 2019, 06:19:56 am »
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.
 

Offline amyk

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Re: Need help identifiying a component
« Reply #8 on: October 31, 2019, 11:58:03 am »
Looks like LNK4012S may be a good match, this is an isolated (or attempt to be) PSU.
 

Offline Rick

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Re: Need help identifiying a component
« Reply #9 on: October 31, 2019, 03:04:26 pm »
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...
 

Offline Rick

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Re: Need help identifiying a component
« Reply #10 on: October 31, 2019, 03:06:24 pm »
Thank you.
 


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