crwdns2933803:01crwdne2933803:0
crwdns2933797:0Dave Empsoncrwdnd2933797:0crwdne2933797:0
crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Dave Empson
- crwdns2933769:0crwdne2933769:0
- crwdns2933771:0crwdne2933771:0
- crwdns2933801:0crwdne2933801:0
crwdns2933807:0crwdne2933807:0
| + | [title] Overview of the faulty LED string. |
|---|---|
| + | [* black] Shows the working led lamps working. There are 200 LED's in parallel with a power supply rated at 3.5V 1.5W, which was confirmed as approximately correct (3.4V off-load). |
| + | [* black] In the non working state, the on-load voltage was 1.8v, and using 1W, explaining why the LED's were not illuminating (They need a threshold of about 3v). This suggested there was a slight short somewhere, but nothing was obvious. |
| + | [* black] The short was easily found in a string of 200 LED's with a thermal imaging camera. (You don't need one, it just explains how I found the location of fault ) |
crwdns2933777:01crwdne2933777:0
crwdns2933779:0crwdne2933779:0
crwdns2915182:0crwdne2915182:0