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Power supply help

am.steen

Jul 10, 2023
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I have this small power supply that output 12v and 38v that only ic is damaged and I do not know its number please help
 

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Delta Prime

Jul 29, 2020
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Make? model number?
The information given on the PCB board itself tells me what store it came from.
U1 there are numbers and letters etched into it but I can't see from the angle you took the photo so you're going to have to put it under a light and wiggle it around too you can see the etched information on the chip.
There are other concerns as well for example.
photo_1711058381576.png
 

am.steen

Jul 10, 2023
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These under board connections I do it my self after chip was burned but the original pcb layout I take it from a Chinese web site is similar to this
 

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am.steen

Jul 10, 2023
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These are the best photos I can get for the burned IC from both sides ...
 

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Delta Prime

Jul 29, 2020
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These under board connections I do it my self after chip was burned
Thank you for your honesty you're definitely going to heaven but you might practice a little more here on Earth "soldering".
This is constructive criticism; if you were to solder brand new components it would not work as expected.
1711209571411.png

Thank you for taking the time to take other photos it's more clear but still do you think you could write down the numbers yourself? Thank you.
 

am.steen

Jul 10, 2023
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For the burned IC
LN1524. The letter L is not clear. I guess it.
On the other side, p1f24s8114
On board
JSQDY-EMO02AG
SU-8490A
 

am.steen

Jul 10, 2023
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I get ca-888 module locally and I install it in my power supply but I do not know where to connect FB as I can not find FB on my board
I need little help to connect the white FB cable as it is not working without it
 

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am.steen

Jul 10, 2023
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The voltage at red cable and ground should be at least 12v but it measured 9v when disconnect red cable it measured 50v. Do I have to decrease r12 value to have 12v or I have to add FB circuit manually ??
 

am.steen

Jul 10, 2023
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I study that link, I am not professional in power supply but I think my board is not PFC. Is it right ??
 

am.steen

Jul 10, 2023
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I add FB circuit and it works with c888 module with those issues
1. Runs on load only ( 12v lamp connected to 12v terminals)
2. The 12v terminals measure 11.5v
3. The 38v terminals measure 51v
4. The ac serial lamp is half lighted

Sorry for digram it is hand drawing

Any suggestions??

This is my ps. Circuit diagram20240406_141845.jpg
 
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davenn

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Sep 5, 2009
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This is my ps. Circuit diagram

which is very different to the circuit board you have. It's missing half of the components on your schematic.
Doesnt show the blown IC
Shows a PC817 Opto-coupler that I dont see on the board ?
The transformer secondary windings are not separate 9 as you have shown them) - It's a tapped winding


Again Note .... it's 38 not 28 .... the 3 is very obvious from your first photos
But I now see that the last photo showing the 12V and 38V is from red coloured terminals
This isnt even the same as your board
PLEASE show photos of the output of YOUR board - both sides

Dave
 
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