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electronic:equipment:Philips-LED [2020/01/13 07:15] tony |
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| - | <html><p style="text-align:right;">Published 31 Mar 2018</p></html> | ||
| - | <html><p style="text-align:center"><b><font size="6">Philips LED Bulb</font></b></p></html> | ||
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| - | I brought a number of Philips LED (light emitting diode) bulbs to replace compact fluorescents, with the expectation of long bulb life and low power use. But one failed within a few months, little used. | ||
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| - | <a href="/dokuwiki/_detail/electronic/philips-led/p2237625.jpg" class="media"><img width="90%" src="/dokuwiki/_media/electronic/philips-led/p2237625.jpg" class="media" title="Philips 10.5W LED Bulb" alt="Philips 10.5W LED Bulb" /></a> | ||
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| - | Faulty Philips 10.5W LED Bulb | ||
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| - | ===== Overview ===== | ||
| - | {{ :electronic:philips-led:p2237645.jpg?200|Bulb label}} | ||
| - | The faulty bulb, which has a standard 240V bayonet fitting, was labeled : | ||
| - | <code> | ||
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| - | 10.5W 6500K 1055lm 95mA | ||
| - | 220-240V 50/60Hz | ||
| - | Made in China 6EV | ||
| - | 9290011648B1 | ||
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| - | </code> | ||
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| - | ===== Hardware description ===== | ||
| - | {{ :electronic:philips-led:p2237626.jpg?300|Bulb with dome removed}} These bulbs have an opaque plastic surround that comes halfway down what would normally be the actual glass bulb area. So the "bulb" is actually a semi-circular translucent plastic dome on the end - it doesn't emit any light upwards. | ||
| - | I used a hacksaw to cut through the edge of the plastic dome, all the way around - taking care to only let the blade penetrate the plastic of the dome and not risk cutting any internal structures. | ||
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| - | Internally are 13 LEDs mounted on a flat PC board labeled "Entry Bulb G6 19UP 20150924", "E347474", "LDB-08". The only other components visible are some surface mounted 0 ohm jumpers. Internally each LED appears to have 3 LED chips, presumably red, green, blue and driven with an appropriate balance to provide 'white' light of the appropriate colour 'temperature'. The board has space for 18 LEDs numbered 1 to 19, "5" appears to be missing. Led "12" appears to have been replaced with a bridge of solder, rather crudely by hand. The board appears to be connected to controller electronics in the base via a two pin edge connector, again crudely soldered by hand.\\ \\ | ||
| - | {{:electronic:philips-led:p2237628.jpg?300|LED board}}{{:electronic:philips-led:p2237634.jpg?300|Normal LED}} | ||
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| - | ===== Fault ===== | ||
| - | {{ :electronic:philips-led:p2237632.jpg?300|Damaged LED}} | ||
| - | The fault appears to be a faulty LED "11". My first thought was that a soldering iron had accidently touched and melted the LED in manufacture, and that it had subsequenlty failed. But looking at the close-ups it looks like it has split right across, so maybe it ruptured from gas build-up after overheating. | ||
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| - | ===== Summary ===== | ||
| - | I haven't finished checking this out, and will have to test the LEDs and trace the fault. I am surprised that there appear to be hand soldered elements in these 'high tech' products. | ||
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| - | ====== References and Additional Resources ====== | ||
| - | * [[http://www.kerrywong.com/2017/08/27/teardown-of-a-philips-dimmable-led-bulb/|Teardown of a Philips Dimmable LED Bulb]], description of another Philips led bulb | ||
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| - | <html><small>If any referenced page no longer exists, try looking for its URL on <a href="http://archive.org">http://archive.org</a>.</small></html> | ||
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