Led tester ,can it be trusted?

[Edgas10]

Hi just wondering if those cheap led testers are reliable.
I ve read somewhere here that these testers can show good leds ,and turns out that they are not.
So how can this happen?
If they light up how can they be bad?
Do leds can be "half"good?
How can i diagnose this?
Thanks edgar

[petehall347]

Re: Led tester ,can it be trusted?

my one seems to work ok apart from you can get a shock off the leads and the instructions say it cant happen .. i use mine mainly to check working ones to see what voltage they are .

[zomi]

Re: Led tester ,can it be trusted?

It uses low current to test them
so when tv psu sends current through its higher and those weak leds don't work..

[zomi]

Re: Led tester ,can it be trusted?

https://www.badcaps.net/forum/showthread.php?t=74186

see here

[Edgas10]

Re: Led tester ,can it be trusted?

It uses low current to test them
so when tv psu sends current through its higher and those weak leds don't work..

Thanks for the info ,So what you are saying is that the tester can light them up but thats not an accurate result.
They can be bad and still light up,correct?
Also ,what can i use to do a proper test to leds?

[handsworth]

Re: Led tester ,can it be trusted?

It uses low current to test them
so when tv psu sends current through its higher and those weak leds don't work..

I use mine to find the bad leds that dont light up and also check voltages. If i'm that far in the tv, then 9 out of 10 times the entire panel gets new leds anyway. Makes no sense to fix a few leds. You'll be back soon doing it again.

[Storyteller12]

Re: Led tester ,can it be trusted?

They have newer led testers that let you adjust current going to them for better testing.

[Edgas10]

Re: Led tester ,can it be trusted?

They have newer led testers that let you adjust current going to them for better testing.

Thanks but how do i know what current to expect from a single led?