New style Samsung LM561C Board

see4

see4

Well-Known Member
Randomblame said:
Okay, only for you I will do some more macro's. Do you really think I want to make these boards bad? Why should I do that? And do not put me down like someone with malicious intent. If I had that, I'd let you buy the fake boards and laugh about it instead of enlightening you!
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Dude, you think its funny and are smiling.. that is malicious intent.
 
see4

see4

Well-Known Member
Randomblame said:
I laugh because they all fall on the same scam, though the web is full of reports of fake supplies from China. If you have ever used the search engine or ask before you buy? If not, I have no pity!
Malicious joy is always the best joy, or do you not laugh when a bird craps your neighbor's car and not yours?
But do not think that does not happen to me!
I already got some fakes from China because I made the same mistake (fake Arduinos is just one example). So basically, I also laugh about myself!
I have been here for several years and always try to help others and as I said, I asked a few days ago for a marco shot, to verify if they are true or fake so that not more people suffer damage!

https://www.rollitup.org/t/new-style-samsung-lm561c-board.955201/#post-13954955
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How does one get a fake Arduino? Its both open source hardware and open source software. Only the name Arduino is licensed.
 
Randomblame

Randomblame

Well-Known Member
So, another 10 macro shots and as I said, every single diode looks the same!
I do not make fun of other people, I want to avoid others making the same mistake!
 

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Randomblame

Randomblame

Well-Known Member
see4 said:
Dude, you think its funny and are smiling.. that is malicious intent.
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Stop pretending nonsense! I will end the discussion with you here!
You just seem to want to provoke and for that my time is too bad!
I have proved that they are not genuine.
If you still like the boards get them!

 
legalcanada

legalcanada

Well-Known Member
Randomblame said:
So, another 10 macro shots and as I said, every single diode looks the same!
I do not make fun of other people, I want to avoid others making the same mistake!
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yes diode A8 i see the ESD or whatever you called it, so are we saying the size and shape looks different than his diodes, or just there's a visible black circle? and B7 looked different also
 
Randomblame

Randomblame

Well-Known Member
legalcanada said:
yes diode A8 i see the ESD or whatever you called it, so are we saying the size and shape looks different than his diodes, or just there's a visible black circle? and B7 looked different also
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They look different in many aspects! The gold wires are visible and you can see a rectange in the middle. The housing looks also different. The ESD device is only one part.
I've no bad intension, I only want to help others to not make a mistake and buy fake boards. But if you don't like to trust me, there is no need to do it.
I do not really care, because it's your money not mine ...
 
legalcanada

legalcanada

Well-Known Member
Randomblame said:
They look different in many aspects! The gold wires are visible and you can see a rectange in the middle. The housing looks also different. The ESD device is only one part.
I've no bad intension, I only want to help others to not make a mistake and buy fake boards. But if you don't like to trust me, there is no need to do it.
I do not really care, because it's your money not mine ...
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its OK i just think its hard to reach conclusion from looking at single diode. i am sure @chuckduck will see this thread tomorrow and inspect his boards a little more closely, he can reach conclusion himself
 
Randomblame

Randomblame

Well-Known Member
legalcanada said:
how many diode are the 2ft boards?
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72pcs!
That's 13,88 till 17,36ct per diode! But H-Series costs almost the same with only 48 diodes.
And the diodes on Samsung strips are voltage binned for only minor voltage differences between the strips( less than 0,2v). This needs an additional step before they are soldered.
I'm pretty sure there is a bigger difference in Vf of each string on these boards simply because they use strings of 24 diodes.
And if they use other diodes with less quality the difference will be even higher. This difference means that there is an imbalance between the strings and this could be the reason, why these boards are limited to only 2100mA(150mA per diode) instead of 2,8A(200mA), which would be the maximum current with true LM561c.
 
V

VegasWinner

Well-Known Member
nxsov180db said:
Not to keep this going but how much do you think HLG was paying for these boards from Jeff? 336 diode boards have about 10% more diodes than the 304's but from what I've read the PCB board has a lower copper content so the production cost for the 336 is likely lower than the 304 that was made for HLG. Do you think HLG was paying more than $35 per board plus shipping to turn around and retail them for $75? I'm not going to argue that some boards are fake but arguing that they are too cheap to be real doesn't make a whole lot of sense in this case. I can buy the diodes for less than 5 cents, I can buy 20,000 from digikey for 6 cents or email them with a larger quote number for an even better price. Lets just say at 5 cents a diode for a 336 board = $16.8. A low copper content pcb board $3. We're at less than $20 in parts. Selling these for $35/ea is a +75% markup. How in the world is it hard to believe that they can give us lm561c s6 diodes at a +75% markup?
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You should check for yourself instead of all the conjecture which is mostly wrong, but you are free to wander in the dark. ask the supplier what they charged HLG instead of picking on the OP, you might be surprised what they paid for volume supply, just because you paid $75 means nothing to what HLG paid, you do NOT know, just making up stuff today.
 
Randomblame

Randomblame

Well-Known Member
nxsov180db said:
Not to keep this going but how much do you think HLG was paying for these boards from Jeff? 336 diode boards have about 10% more diodes than the 304's but from what I've read the PCB board has a lower copper content so the production cost for the 336 is likely lower than the 304 that was made for HLG. Do you think HLG was paying more than $35 per board plus shipping to turn around and retail them for $75? I'm not going to argue that some boards are fake but arguing that they are too cheap to be real doesn't make a whole lot of sense in this case. I can buy the diodes for less than 5 cents, I can buy 20,000 from digikey for 6 cents or email them with a larger quote number for an even better price. Lets just say at 5 cents a diode for a 336 board = $16.8. A low copper content pcb board $3. We're at less than $20 in parts. Selling these for $35/ea is a +75% markup. How in the world is it hard to believe that they can give us lm561c s6 diodes at a +75% markup?
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That's a bit generous, because there are costs for employees, gerber filers, machine use and energy and so on, but you're right, if you really want it, you could produce it so cheaply. Nevertheless, these boards seem to maximize their profits by not using real LM561c.
IMO, the best way to get real LM561c from a chinese supplier is to say to the seller that you verify the authenticity of every LED and that you plan to buy hundreds of boards in the future if the first say we 8 samples are genuine.
If you do so, he will probably use real Sammy diodes because he wants of course sell more boards if possible.
 
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