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Cracked Power IC In Power Supply Identified

By on April 21, 2015
power supply repairings








The Conceptronic 90 Watt Universal Power Supply controller ic was completely blown up-identified

power supply repair

It was soldered to the bottom side of the pcb. But was not readable anymore because the plastic top was blown off. Luckily I did find the very small plastic top parts of this smd ic. But couldn’t photographit because it was just too small. (The chip left on the safe side is a 358 opamp). So I used my originally not for Windows 7 made Traveler USB Microscope. With build in Led lights and 10x, 60x up to 200x Zoom in.

This microscope I happily could update for Windows 7 by using the new USB driver from the internet. The driver is called: “Mikroskoptreiber Mod.I 2008 ZC-700W.exe”.

And instead of the originally enclosed VideoStudio 7 SE program from Ulead (no Windows 7 version), I use the pc program AVEO USB2.0 for PC camera to make snapshots or even video’s from broken parts. Mostly as in this case for reading the originally chip names from badly damaged and also burned parts. (See photo’s of this nice USB Microscope which is ideal for these kind of forensic investigations).

power supply repairs

power supply repairing

From the controller chip top only the characters LD could be determined. Everything else was blown away. But the 2 earlier mentioned little plastic top parts still weren’t lost and readable. The part name of this chip on the pcb was SU1.

From the photo’s below I managed to find out what the originally controller part was. A LD7575 !

power supply ic burnpower supply ic badld7575ld7575 icpower supply ic ld7575

Also the other blown parts are shown: A 20N60C3 Mosfet, and a C812 MURF 860 which is a 8A 600V special semiconductor from ON semiconductor (left pin is Cathode, right Anode). Both were isolated by some kind of teflon caps and with clamps attached to the Cooling Alu metal. (See next photo).

power supply ic burn5

Above the now 2 unCapped and internally totally shorted Mosfet and special MURF860 Diode. On the left from them is the mounted optocoupler. Plus 2 resistors in front of them on the component side with an original value of 620 ohm (R1) and also a bigger 0.22 Ohm (R2) were defect (burn marks see next photo). And their values were also wrong now!

power supply ic burn6

The Conceptronic pcb text was Model: FONY 9045 LED (4in1). DATE 2008-12-12.

I’m sure that after replacing all these parts, and the fuse of course, my power supply will work again. But since I do not have these parts at this moment I can’t show it.

But therefore I give this report in the meanwhile to show that also this very professional 90 Watt 12 to 24V Adjustable Power Supply with Deluxe Display and 5V USB 1AMP output from Conceptronic is completely repairable! (See next photo: the Top and Bottom of the professional looking housing).

power supply ic burn7power supply ic burn8

And to conclude this repair some photo’s that show the PCB from all sides:

power supply ic burn ld7575repair power supplypower supply ic burn ld7575 ics

The two 3 pin standing black TO-220AB housed components are Dual 20 Amp High Voltage Barrier Rectifiers 150V. And the chip 8 DIL above the 2 Elco’s of 1000 uF 25 Volt, right of the Coil, is a 34063APT DC to DC 1,5 Amp max 40V adjustable converter control circuit.

The primary Fuse was a Fast 5 Amp (!!) 250 Volt glass type with soldered wires.

Another nice repair article to fix a very nice and also unique Conceptronic Power supply for universal use at Home!

Cheers !

Albert van Bemmelen, Weert, The Netherlands.

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  1. Andre Gopee

    April 21, 2015 at 10:14 am

    Very Nice Detective work. A micro |Scope is really a handy thing to have for these kind of circumstances... I have an AVEN Micro Scope that I bought some time and it has pull me out quite a lot in the pass... I would advise electronic repairer to get a Micro Scope. Thanks again for the article and keep up the good work.

  2. Robert Calk

    April 21, 2015 at 10:25 am

    Good job Albert. Can't wait to see it fixed. I'm glad that I have a digital camera microscope - they are valuable tools.

    • Albert

      April 24, 2015 at 11:09 pm

      Hi Robert,

      I watch your repairs also ! (Just like that of the other guys on Jestine's site. And I won't thank everybody for leaving comments but if they read this. Thanks for all their articles too!). Since you have such a nice Electronics Shack at home, Robert, (and probably much cleaner than mine ?) I wandered why you said you are still learning Electronics? But I guess learning is something we have to keep doing everyday! Bye bye.


      • Robert Calk

        April 25, 2015 at 8:00 pm

        Thanks Albert. I have only been learning electronics for almost 3 years, primarily in device repair. There are always new things to learn - learning is never-ending.

  3. Yogesh Panchal

    April 21, 2015 at 2:03 pm

    Good work with help of the good tool.

    • Albert

      April 24, 2015 at 11:15 pm

      Thanks Yogesh !

      Jestine told me to look on the Aliexpress site for parts but sadly in the Netherlands we can't pay with PayPal and so we buy from Ebay. (is more expensive sadly).


  4. Waleed Rishmawi

    April 21, 2015 at 4:15 pm

    that is so strange..I had a power supply that charges up to 3 batteries and I found a blown ic with the same part mentioned in this article. it was LD7575PN. I was lucky to find the top blown part inside the box of the charger other wise I would have found the part number for it. I am still looking for a new part and so far, I cannot find it.

    • Jestine Yong

      April 21, 2015 at 5:01 pm

      Hi Waleed,

      You can get the part from and


      • Waleed Rishmawi

        April 22, 2015 at 3:35 pm

        thanks. I will check it out

  5. Renato P. Estopace

    April 21, 2015 at 5:52 pm

    A very helpful article on burned smd ic which needs to be identified specially that it has no schematic diagram. the digital microscope plays a vital role. I hope i could own one, but this time I use magnifying glass only.Thanks a lot

    • Albert

      April 24, 2015 at 10:58 pm

      Hi Renato,

      The USB Microscope in my article wasn't that expensive at all. I think I bought it about 5 years ago from ALDI (German Supermarket in Holland) for around 30 euro's. And because I could upgrade the old driver it still does work today.
      Hope you'll find one cheap !
      Cheers !!

      • Robert Calk

        April 25, 2015 at 8:07 pm

        I have a Celestron digital camera microscope that is handheld and is battery powered. It uses 2 AA batteries.

  6. Rob Manwiller

    April 21, 2015 at 10:41 pm

    Jestine, IMO, you are a cut above any tech I've ever known. Not many would be this meticulous in searching (let alone finding) something like this in this micro world of electronics. I'd love to be doing this kind of tech detective work, but haven't finished my original music project as yet. Maybe I'll get to your info, troubleshooting course and techniques later this year, or maybe in my second life (if that happens). I'm so many light-years behind you, Jestine, it boggles my mind every time I read one of your emails. :>(

    • Jestine Yong

      April 22, 2015 at 12:08 pm

      HI Rob,

      You are welcome.


  7. Humberto

    April 21, 2015 at 11:04 pm

    Good job and a very useful tool you have. Congratulations.

  8. Corriete

    April 22, 2015 at 1:33 am

    great!thanks for sharing this .it is very important

  9. Albert Hoekman

    April 22, 2015 at 3:12 am

    Nice job Albert, keep om going.

  10. Russell Trewella

    April 22, 2015 at 10:33 am

    Nice job. I must get one of those microscopes. Invaluable in this line of work.

  11. Danny

    April 23, 2015 at 4:54 pm

    Thanks Albert

  12. Mohd Usman

    April 24, 2015 at 12:06 am

    Good job done. I have discovered a novel way to know blown ICS. Thanks for sharing.

  13. Manjunath

    February 26, 2018 at 11:31 pm

    Refrigerator PCB power IC Bnru No Nomber How Fiibd out tis nomber.sir


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