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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Autopsy on a failed 50W LED floodlight
Chinese no-name YXY-FGD-50W
White goo under the LED metal backing, only covering about 1/3 of the area, as originally placed blob , not fully splurged. Bowing of the metal at rear of the LED array , probably at original placement due to blob shape of the goo , only maybe worsened in use. So heatsinking via the periphery only , ie delayed heatsinking. |
#2
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Autopsy on a failed 50W LED floodlight
On Friday, June 23, 2017 at 4:09:03 AM UTC-4, N_Cook wrote:
Chinese no-name YXY-FGD-50W White goo under the LED metal backing, only covering about 1/3 of the area, as originally placed blob , not fully splurged. Bowing of the metal at rear of the LED array , probably at original placement due to blob shape of the goo , only maybe worsened in use. So heatsinking via the periphery only , ie delayed heatsinking. The 12v 5A SMPS units from China as well only have a thin seam of white thermal paste at the edge of the switching transistors to make it 'appear' properly done, there is none between the transistor and the heatsink = early failure. I have to reapply paste on all before I use them. |
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