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Tech Head - The Technology Section
So changing from 12v Halogen to 12v LED (bollox ?)
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<blockquote data-quote="Vipersan" data-source="post: 960609" data-attributes="member: 325666"><p>Now ..</p><p>you might one day hear about this on watchdog ...so take note.</p><p>I relaced 2 halogens in each bank of 3 with the LED lamps I received today ..</p><p>granted they are sold unbranded on ebay ...and the vendor is UK based ..</p><p>I purchased 12 of these a few days ago at a cost of £36..so not cheap by any means.</p><p>They arrived this morning ..and were fitted this evening ...</p><p>I left the lights on and went to put the kettle on and make a brew..</p><p>I returned some 15 minutes later to find ALL but 3 LED lamps and all 4 Halogens were out..</p><p>I removed all the LED lamps and tested them on a 12vDC psu ..</p><p>at least 6 of them did not light up ..</p><p>Curiosity being something I have to persue ...I bit the bullet and smashed the glass envelope open on one of these dead bulbs ...being careful only to break the glass an leave the internals intact..</p><p>Imagine my surprise to find one of the white wires that connect the rear two pins to the led matrix pcb ...floating in mid air thus isolating the pcb from the 12v supply ..</p><p>I resoldered this to the board ..and once again powered it ..</p><p>It lit no problem ..</p><p>So ...it would appear the heatr generated by the LEDs which conducts through the PCB is sufficient to melt and desolder at least one of the connections ...thus the bulb effectively fails as this soldered conection is within the enclosed glass envelope and not repairable..</p><p>It could well be that they use low melting point solder in the construction ...thus engineering a potential future fail ...or simply dont solder well enough during manufacture...</p><p>either way ..it's bad form ...</p><p>..and I may well report my findings to Watchdog ..and send them a failed sample to investigate...</p><p>Here is a photo ..</p><p>Keep in mind I have soldered this to test the leds ...but unsoldered it again for the photo..</p><p>rgds</p><p>VS[ATTACH=full]90395[/ATTACH]</p></blockquote><p></p>
[QUOTE="Vipersan, post: 960609, member: 325666"] Now .. you might one day hear about this on watchdog ...so take note. I relaced 2 halogens in each bank of 3 with the LED lamps I received today .. granted they are sold unbranded on ebay ...and the vendor is UK based .. I purchased 12 of these a few days ago at a cost of £36..so not cheap by any means. They arrived this morning ..and were fitted this evening ... I left the lights on and went to put the kettle on and make a brew.. I returned some 15 minutes later to find ALL but 3 LED lamps and all 4 Halogens were out.. I removed all the LED lamps and tested them on a 12vDC psu .. at least 6 of them did not light up .. Curiosity being something I have to persue ...I bit the bullet and smashed the glass envelope open on one of these dead bulbs ...being careful only to break the glass an leave the internals intact.. Imagine my surprise to find one of the white wires that connect the rear two pins to the led matrix pcb ...floating in mid air thus isolating the pcb from the 12v supply .. I resoldered this to the board ..and once again powered it .. It lit no problem .. So ...it would appear the heatr generated by the LEDs which conducts through the PCB is sufficient to melt and desolder at least one of the connections ...thus the bulb effectively fails as this soldered conection is within the enclosed glass envelope and not repairable.. It could well be that they use low melting point solder in the construction ...thus engineering a potential future fail ...or simply dont solder well enough during manufacture... either way ..it's bad form ... ..and I may well report my findings to Watchdog ..and send them a failed sample to investigate... Here is a photo .. Keep in mind I have soldered this to test the leds ...but unsoldered it again for the photo.. rgds VS[ATTACH=full]90395[/ATTACH] [/QUOTE]
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Tech Head - The Technology Section
So changing from 12v Halogen to 12v LED (bollox ?)
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