Timeline for Troubleshooting defective LED bulbs
Current License: CC BY-SA 4.0
12 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 7, 2019 at 11:14 | comment | added | JinSnow | @MagTun you might be interested by this (it shows in details how it works) (Thanks to G36!) tinyurl.com/yxnvngos | |
| May 6, 2019 at 19:45 | comment | added | JinSnow | @G36 thank you so much! | |
| May 6, 2019 at 17:58 | comment | added | G36 | @JinSnow This 3 pin device is not a single transistor but an IC circuit. So so you cannot simulate it via a single transistor. But you can play with this tinyurl.com/y4wa4qdo | |
| May 6, 2019 at 16:45 | comment | added | JinSnow | @G36 Thanks a lot! I'll look at it. I'm trying to make it work on tinyurl.com/y3knbeuc (I'm struggling to find the missing piece (??). I'll be gratefull if you could just check if the transistor is ok) | |
| May 6, 2019 at 16:17 | comment | added | G36 | @JinSnow You can see here st.com/content/ccc/resource/technical/document/application_note/… How the current is flowing. And RS4 was used to discharge a CS2 capacitor after you turn off the LED. | |
| May 6, 2019 at 15:09 | comment | added | JinSnow | @G36 I'm confuse about the top right part: does the current goes first to LED, and then to RS4? What the purpose of the RS4 ? And after powering the LED, where goes the current to RS4 or to T1 (or both?)? And then to DS1 or to the Drain pin? (Sorry for the basic question, I'm a beginner) | |
| Jan 17, 2019 at 7:35 | vote | accept | MagTun | ||
| Jan 2, 2019 at 13:55 | comment | added | G36 | Simple desolder the RS2 or RS3 as Brian Drummond suggested. The LED peak current should drop by a half. And I don't know why your LED's are burning. | |
| Jan 2, 2019 at 12:42 | comment | added | user16324 | No, follow G36's hint. To control the current, adjust RS2,RS3. To half it, remove one of them. IF he has correctly identified the circuit. | |
| Jan 2, 2019 at 11:44 | comment | added | MagTun | Thanks a lot @36 for this nice circuit! Does the 250mA in the LED means that my LED are burning because they get too much current (apparently there limits is 100mA ― from the guy on the forum I mentionned in the question). How can I fix this? Will adding a resistance on the red wire works (the positive wire that feed the LED PCB)? If yes which value will works? | |
| Jan 2, 2019 at 11:30 | history | edited | G36 | CC BY-SA 4.0 |
added 63 characters in body
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| Jan 2, 2019 at 11:25 | history | answered | G36 | CC BY-SA 4.0 |