Dodgy soldering was usually easy to spot when solder had lead in it. RoHS solder looks a bit iffy even when its good, so the demarcation point is a bit more vague. RoHS solder can develop a hairline crack around the fillet, that's very hard to see. Sometimes badly prepared component leads have a thin oxide layer - the solder joint seems to work OK for a while, its not a bad idea to remove all the solder with a solder sucker or desolder braid and remake the joint from scratch. Talking of scratching - its a good opportunity to scrape the component lead to clear any oxide.Thanks for your replies. The solder joints on the boards and LEDs "look good". They appear consistent. Is it likely to have two bad soldier joints and separate components?
As AK stated above, strange coincidence that two "separate" circuit LED's would go out at around the same
time (not sure if at the same time or around the same time).
I thought LEDs were long lasting and these, relatively, do not have a lot of hours on them.
Still not sure. If these are powered by 15v, can I just hook in a 9v battery to light them up?
This is generally true, but a smallish number will fail due to infant mortality and some will fail due to improper handling during assembly/soldering.I thought LEDs were long lasting and these, relatively, do not have a lot of hours on them.
You need to limit the current if you do it. 200 to 560 ohms will give you 5-15mA.Still not sure. If these are powered by 15v, can I just hook in a 9v battery to light them up?
by Jake Hertz
by Jake Hertz
by Jake Hertz
by Jake Hertz