mercedes key vaneo

[vageric]

hallo i have a key here from a vaneo what does not work.
if i push the button on the key the red led dont light up.
i have change the nec from the Original key to a donor key that work.
but now i can read the key out through IR but i cant get the freq MHZ read.
when i push the button led light up but dont read MHZ.
someone know what can be the problem?
is the black key with nec inside.
thanks in advanst

[lion0304]

hallo i have a key here from a vaneo what does not work.
if i push the button on the key the red led dont light up.
i have change the nec from the Original key to a donor key that work.
but now i can read the key out through IR but i cant get the freq MHZ read.
when i push the button led light up but dont read MHZ.
someone know what can be the problem?
is the black key with nec inside.
thanks in advanst

Does your NEC is soldered in right place? All pin are correclly soldered? You use solder iron or hot air gun? If hot air, press slightly on the chip when you heat up.

[vageric]

i use solder iron
and yes if i look i see all pins are line up