i removed these led board from my previous car, they still work fine, i tried on other places as well and they are good, but they just don't work when i put them at the front dome light. i have a bigger one that put at the rear dome light with no problem. does anybody know why? Thanks!

i have a 2010 IS250

Did you make sure the dome lights are activated, by pressing On/Off or toggling the "Door" button?

Or a blown fuse. Try stick a stock bulb back in and see if its putting out any power

Yes, i tried toggle the on/off and door button, but only the rear dome light goes on, not the front

i tried the stock bulb and the other led i bought from ebay, they work fine...i am wondering if the front dome light only support something that has lower wattage?