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Old 08-04-2014, 12:49 AM #1
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Default 445NM Blown Diode

My laser diode screwed up and it turned into an 'LED'. Do you think it would be wise to get a new driver for it as well just incase?

Here is the emission test photos;

Laser - Imgur

Here is what the laser consists of;

Laser. - Imgur


The driver is a 1.8A Mohgasm Driver.
The Diode is a M140 445NM.
The Host is a C6 AURORA.

Also;

When I brought my host it didn't come with the screw for the heatsink... What size is the screw I need one ASAP.



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Old 08-04-2014, 12:56 AM #2
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Default Re: 445NM Blown Diode

Would be best to identify the failure first, it will let you know what parts need to be replaced. The driver may be dead, driving it below the threshold current.

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Old 08-04-2014, 07:29 AM #3
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Default Re: 445NM Blown Diode

Quote:
Originally Posted by ARG View Post
Would be best to identify the failure first, it will let you know what parts need to be replaced. The driver may be dead, driving it below the threshold current.
How do we do that? Also i've already been told by a lot of others from a thread i posted a while ago that the Diode has turned to a LED.
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Old 08-04-2014, 09:29 AM #4
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Default Re: 445NM Blown Diode

Take the diode out of circuit and attach a test load in its place.
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Old 08-04-2014, 06:12 PM #5
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Default Re: 445NM Blown Diode

Test the cells, check their voltage and take a tailcap current reading. Test the driver on a test load, or with an ammeter. Make sure it is running at the correct current.
If you find both the cells and the driver are working correctly you can assume the diode is dead.

No need to replace what isn't broken
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Old 08-04-2014, 11:11 PM #6
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Default Re: 445NM Blown Diode

At the above 2 posts, I don't really know much about all that stuff.. and I don't have any of the equipments.

I think I should just replace the driver since they're not THAT expensive. And if the diode is still they way it is, I can assume the diode is broken.

What do you think?
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Old 08-04-2014, 11:15 PM #7
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Default Re: 445NM Blown Diode

That works. Or you could have one of us look at it.
Aren't there a few LPFers in the Sydney area?
If not, heck, I bet Dave Jones would be thrilled to
take a look at one of these.
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Old 08-04-2014, 11:17 PM #8
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Default Re: 445NM Blown Diode

All you really need is a multimeter - less than $20. Plus it's a great learning experience and a useful skill to have.

But if not, replacing the diode and driver would be the next best thing.
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Old 08-04-2014, 11:23 PM #9
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Default Re: 445NM Blown Diode

If I buy a driver first, and the diode is broken.. Could that stuff the driver or no?
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Old 08-04-2014, 11:39 PM #10
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Default Re: 445NM Blown Diode

Only if it failed open circuit and the driver is buck or boost.
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Old 08-05-2014, 12:11 AM #11
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Default Re: 445NM Blown Diode

Quote:
Originally Posted by The Lightning Stalker View Post
Only if it failed open circuit and the driver is buck or boost.
It's a 1.8A Mohgasm driver, so I'm not sure.
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Old 08-05-2014, 12:37 AM #12
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Default Re: 445NM Blown Diode

That one is linear, so it wouldn't matter. Good
luck finding another Moh driver, though. They
aren't made anymore.
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Old 08-05-2014, 12:42 AM #13
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Default Re: 445NM Blown Diode

Quote:
Originally Posted by The Lightning Stalker View Post
That one is linear, so it wouldn't matter. Good
luck finding another Moh driver, though. They
aren't made anymore.
Damn.... They are so good. :/

What else is a good replacement?
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Old 08-05-2014, 12:45 AM #14
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Default Re: 445NM Blown Diode

Quote:
Originally Posted by Qorx View Post
Damn.... They are so good. :/
That's why I'm thinking the driver is still good.
Linear drivers are hard to kill unless you put
the battery in backwards or inadequate
heatsinking or something.

Quote:
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What else is a good replacement?
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