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simple way to test case LED?

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post #1 of 16 (permalink) Old 01-29-2019, 06:14 PM - Thread Starter
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simple way to test case LED?

(dunno where to post this cause there's no "general hardware section" so here goes)

is there a simple way to test a case LED?

in my case the PWR LED which doesn't light up but I don't know if it's really the case LED/wiring/connectors (new case), or if it's some quirk on my mobo (happens sometimes apparently)

I connected the green & white connectors ( http://i.imgur.com/4E5G6.jpg ) both ways ie corresponding & opposite signs but no reaction either way

HDD LED works normally

I assume it ain't as simple as using a 1.5V battery...or is it? don't wanna risk damaging the LED if its intact

Last edited by pulverizor; 01-29-2019 at 06:19 PM.
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post #2 of 16 (permalink) Old 01-29-2019, 08:23 PM
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post #3 of 16 (permalink) Old 01-29-2019, 08:39 PM - Thread Starter
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Quote: Originally Posted by anti-clockwize View Post
what happens if I use weaker battery (say 1.5V AAA bat) without resistor?
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post #4 of 16 (permalink) Old 01-29-2019, 10:15 PM
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You might end up with a current too high for the diodes.

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Last edited by BroadPwns; 01-29-2019 at 11:14 PM.
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post #5 of 16 (permalink) Old 01-29-2019, 11:08 PM
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Yeah ^^

This should answer your questions:
https://tinkerlog.com/2009/04/05/dri...ut-a-resistor/
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post #6 of 16 (permalink) Old 01-30-2019, 07:16 AM - Thread Starter
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ok

btw anyone know what's the voltage between a mobo's PLED- & PLED+ connectors? (I dont have a multimetre)
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post #7 of 16 (permalink) Old 01-31-2019, 10:58 PM
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Actually it's simple. Just plug in the power LED connector to the HDD pins on your motherboard. If it's ok, it should start sporadically lighting up whenever there are operations of read/write on your HDD. And as far as I remember the polarity doesn't really matter with these pins, but better to follow it just in case.

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post #8 of 16 (permalink) Old 01-31-2019, 11:42 PM
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Quote: Originally Posted by azeures View Post
And as far as I remember the polarity doesn't really matter with these pins, but better to follow it just in case.
It does.
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post #9 of 16 (permalink) Old 02-01-2019, 01:53 AM
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Quote: Originally Posted by gt86 View Post
It does.
It indeed does. It's the Power and Reset button switches that don't matter.

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post #10 of 16 (permalink) Old 02-01-2019, 02:04 AM
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Quote: Originally Posted by BroadPwns View Post
You might end up with a current too high for the diodes.
The LED will draw current based on voltage like anything else, the difference is the fact that the relationship between the two isn't linear. 1.5v has been fine for all the LEDs I've ever messed with.

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