Help identifying these SMT passive components - B&O ICEpower 200ASC

On semi do not offer inductors. The marking L201 refers to the large wound inductor just off the photo (although it is close to the on semi device).

No idea what the on semi part is though - most likely a diode of some sort, e.g. schottky diode, or some other diode.

Hi shabaz,

Ah, good spot - that'll explain the directional band then. I'll keep searching along the diode front.

Meanwhile, the hunt for the resistor continues

Cheers

Gareth

shabaz is correct -- it appears to be a Zener diode.

I did a Google search for "Onsemi marking 733 MX" and got this: http://www.onsemi.com/pub_link/Collateral/1SMB5.0AT3-D.PDF

According to page 3, "MX" means it's a 1SMB48AT3G 48V Zener.

Thanks so much! I've been struggling with that for a good while! They're in the shopping basket - thanks again!

Do you think I'm on the right lines with the resistor? You can find 1218/1812 resistors, but very few are 0.02 OHM and the Yageo RL1218FK-070R02L is the only one I can find with the long side termination at that value/package.

Cheers,

Gareth

Hi Gareth,

That is a 0.02 ohm resistor as you say, and you'll need one of the same size (since a larger one won't easily fit) due to the power requirements (which you won't know).

Basically you could just measure the dimensions and find a similar sized one. This one looks roughly the right size:

ERJC1CFR02U - PANASONIC ELECTRONIC COMPONENTS - RESISTOR, 0.02OHM, 2W, 350PPM, SMD | Farnell element14

I'd probably pick that one, it is low cost too.

I've put an order in - many thanks for your help! Fingers crossed

Hi there,

I also had the same problem with overheating of the resistor and zenor diode. I followed the same approach and replaced the two capacitors next to the zenor diode (one of these had blown out), the Zenor and the 0.02 ohm resistor. I then applied power and nothing else connected to the board and the same components started to heat up rapidly. I disconnected the power and then took a further look at resistance of the components in general ie inductors resistors and transistors. I then found that two of the MOSFET transistors (marked 400N06N) were closed circuit and shorting out the output stage. I de soldered 2 of the four which had a short (the 2 nearest the 0.02 ohm resistor marked R020) and re connected the power supply. None of the components appeared to heat up at all so I am taking a guess that these are most likely the cause of the failure of the resistor and zenor. I have ordered replacement MOSFETS here:

https://au.mouser.com/ProductDetail/Infineon-Technologies/IPD400N06N-G/?qs=sGAEpiMZZMutXGli8Ay4kJR0AeOXfgqWqALtgsH3p1M%3…

So not a very scientific approach but it would make sense that the MOSFETS suffered from the overloading this may be the answer. I am yet to receive the components and do the repair. If anyone is out there wanting feedback let me know.