LED Reading Lamp - meltdown in driver compartment

[gintama]

I'm looking to ID this part on the board from an LED lamp:


The structural ribbing in the lamp housing is blackened above where the component was sitting. Guessing the PCB should have been fastened on an angle to keep the hot bits away from the plastic. The copper discs in the background are capacitive pads for the controls, which now glitch out to varying degrees.




From the duplicity of the PCB (there are two strings of LEDs, warm/cool, only one of which works now) I believe the trashed part is the same as the one on the upper circuit, marked with L4611 / 3360 but no visible brand marking:


Could it be this regulator? Integrated Silicon Solution Inc IS31LT3360-SDLS3-TR @ Digikey
The caps look OK, the two UNITED pieces are 12v 25uF, and the more upright one is a Cheng 16v 100uF.

The lamp was from Costco and looks identical this AliExpress item:
http://www.aliexpress.com/item/Free-...345778571.html

.

[CapLeaker]

Re: LED Reading Lamp - meltdown in driver compartment

it very well could be the LED driver. That also explains why one set is working and not the other in your case.

[kc8adu]

Re: LED Reading Lamp - meltdown in driver compartment

looks like you found the part.
its cheap enough to try it.
hopefully the cob didnt get damaged.
some drivers blow up if leds open up.using diode test on dvm test the ones in the dead string.they will light dimly if good.one that doesnt light is bad.

[gintama]

Re: LED Reading Lamp - meltdown in driver compartment

Thanks for that kc8adu, wish I would have seen it sooner. I got the replacement driver and new caps, and eventually got them wired in after bypassing the broken PCB traces. The second set of LEDs came on, but this also resulted in the initial symptoms (capacitive control buttons misbehaving) to return. Figuring the cause was the black blobbed IC and therefore irreparable, I pulled the newly installed driver and wired a switch onto the other output to select either the warm or cool lights. This worked great for about 45 seconds... Then the lamp abruptly ceased functioning, and that was the end of that.