Seoul Tbin from DX...duds?

[Illum]

I bought two of these guys from DX:shrug:

hooked up 3.5V and nothing....neither of the two lit up:shakehead
I was surprised and tried touching the contacts on the emitter itself...still nothing :thinking:
okay....according to the data sheet its Vf ranges from 2.9-3.8v
it gives no indication of the emitter being incorrectly installed [unless I'm looking at it backwards]. I don't have my camera on hand so I'll just describe it

orient the star so that you can read Seoul above the contact on left and ZLED below the contact on right...the emitter's gold contacts are pointing to top right of the star. Both LEDs are received as such. I used my AMM [analog multimeter] and found no shorts between the (+) and (-) contacts.

I have not attempted to hookup the LED in reverse to see what might happen

any ideas?

 

[TorchBoy]

I'm surprised the datasheet doesn't mention reverse voltage, but I'd say it would be alright to put 3.5V on the opposite contacts to those you've tried. The Cree XR-E can handle 5V in reverse.

But before you try that, is the emitter on the board the right way round, with the hole in the pin as per the first photo at DX?

 

[ktronik]

if you have a metter, why don't your just test the LED with it??

It will tell you if it works.

Just touch the leads to the emitter legs... you can't blow it with your metter & if you get it around the right way the LED will lite very dimly...

K

 

[Illum]

yes, it is the same as the DX photo

my meter is at move 1.5Vs....not 3
I've applied 3Vs directly to the LED contacts and tried reversing the polarity and nothing, the data sheet listed the minimum forward voltage to be 2.9...my cheap power supply set at 3V my meter read 3.2V so it should light at least dimly...but even in a dark room I see no indication of it trying to light

first time trying Seoul and the first impression isn't too impressive

 

[TorchBoy]

It really does sound like they don't work.

 

[Illum]

I've read that another user [in the cree lantern thread] who bought Seouls from DX and DOA....I'm glad I wasn't the only one:shakehead

 

[sysadmn]

yes, it is the same as the DX photo

my meter is at move 1.5Vs....not 3
I've applied 3Vs directly to the LED contacts and tried reversing the polarity and nothing, the data sheet listed the minimum forward voltage to be 2.9...my cheap power supply set at 3V my meter read 3.2V so it should light at least dimly...but even in a dark room I see no indication of it trying to light

first time trying Seoul and the first impression isn't too impressive

I think he meant the "diode" setting on the meter, not Voltage. Many meters have a setting in the resistance range for diodes. You can also (usually) use the audio continuity check - it uses a low enough current that the diode won't be harmed.

http://www.repairfaq.org/sam/semitest.htm#sttdj

HTH

 

[chimo]

Try applying a voltage from the slug to each the legs in turn.

 

[Illum]

I think he meant the "diode" setting on the meter, not Voltage. Many meters have a setting in the resistance range for diodes. You can also (usually) use the audio continuity check - it uses a low enough current that the diode won't be harmed.

http://www.repairfaq.org/sam/semitest.htm#sttdj

HTH

http://img.alibaba.com/photo/51773652/Analog_Multimeter.jpg
My multimeter isn't that advanced

chimo, I've been there...no good

 

[ktronik]

I've applied 3Vs directly to the LED contacts and tried reversing the polarity and nothing

Yes diode setting, sorry...

If this is correct & you have put 3v DC across both legs & got nothing... it sounds dead...

sorry

K

 

[Illum]

well...:thanks: for the help anyway

DX...:shakehead

 

[Fallingwater]

Open a ticket and tell them your emitters don't work. They usually send replacements without even asking you to mail the defective items back.