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electronic:equipment:Philips-LED [2020/01/13 07:15]
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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>​ 
-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. 
-<div class="​shadows"​ style="​text-align:​center">​ 
-    <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>​ 
-  <div class="​container">​ 
-    Faulty Philips 10.5W LED Bulb 
-  </​div>​ 
-===== Overview ===== 
-{{ :​electronic:​philips-led:​p2237645.jpg?​200|Bulb label}} 
-The faulty bulb, which has a standard 240V bayonet fitting, was labeled : 
-          10.5W 6500K 1055lm 95mA 
-             ​220-240V 50/60Hz 
-           Made in China  6EV 
-             ​9290011648B1 
-===== 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. 
-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}} 
-===== 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. 
-===== 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. 
-====== References and Additional Resources ====== 
-     * [[http://​​2017/​08/​27/​teardown-of-a-philips-dimmable-led-bulb/​|Teardown of a Philips Dimmable LED Bulb]], description of another Philips led bulb 
-<​html><​small>​If any referenced page no longer exists, try looking for its URL on <a href="​http://​">​http://​</​a>​.</​small></​html>​ 
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