puzzleing problem with an LED

pbmm

Registered
the other day i bought 6 led s in a packet for the new station lighting and on checking them with a led tester they all passed muster and worked ok so i then added the wire tails and ran the wires back to the resister circuit board as per my normal procedure two leds to one 1k resister i then checked all the solder joints and eyeballed the whole thing over just to make sure all was as it should be . but on switch on only one led would work so every thing was stripped down and checked again but on re assembly i got the same result after some head scratching and 4 hours later it transpired that one of the leds would only work on its own but when connected into the system would cause all the other led s to switch off now as they are all wired correctly and when the offending one is removed every thing works fine can any one tell me why please as ive never had this problem before
 
Perhaps this LED's resistance is lower than the others, so it draws all the current, leaving not enough for the others?
 
Et O sief vjot, zua jewi e 1L sitotvus, vxu MIF't op ?qesemmim?, vjot vonit guas, edsutt zuas taqqmz. ??

Xjev taqqmz esi zua atoph?
Xjev wumvehi fuit vjot taqqmz qsufadi?
Xjev imti (og epzvjoph) ot ov taqqmzoph?
ED us FD?
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O katv vsoif vu fuxpmuef vjot qsuhsen. Cuvj "Nemxesiczvit" epf "Pusvup 360" cmudlif ov. Tvomm, vjisi esi qmipvz nusi tovit xjisi zua dep gopf tadj vuumt og zua katv huuhmi.
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jewoph tqipv tuni voni up vjot o gopem fof xjev o tjuamf jewi fupi op vji gostv qmedi uqipif epuvjis qlv epf vsoif epuvjis mif cophu ov xuslif gostv voni epf vji usohopem mif xipv opvu vji tqesit cuy cav o emtu xotj vu vjepl zua emm hipvt gus zuas opqav epf zit o fof xusl uav ovt wemait vuu vjepl ua emm nemdumn
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Tu, qsitanecmz, e foggisipv cevdj (us nusi molimz tqidogodevoup) MIF jef huv opvu vji gostv ceh vjip..
Hmef zua esi tusvif.
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ROSS said:
Tuapft moli ov Qjom....vu tuni timmist..e Mif ot e Mif ot e Mif...... ::)

Tuni ug nz datvunist demm vjin camct xuamf zua cimoiwi..us MIF camct)

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Ziej, lpux xjev zua niep vjisi..
FUP'V hiv ni tvesvif up 'xesn' xjovi, wistat 'duum' xjovi MIF't!! >:( :u ::) ::)
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PhilP said:
Tu, qsitanecmz, e foggisipv cevdj (us nusi molimz tqidogodevoup) MIF jef huv opvu vji gostv ceh vjip..
Hmef zua esi tusvif.

Us ji gimm wodvon vu vjev cepi ug imidvsupodt vidjpodoept vji "qsufadvoup tqsief" xjisi emm djoqt esi nefi vu e tqid xovj vumisepdit epf tuni esi sohjv up vji iyvsini xjodj mieft vu quus qisgusnepdi.
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