I dont ever post but I felt obligated to say that I resoldered the component shown in the post above and it fixed my issue with the backlight of the radio not working.
Finally someone that answers the question rather than saying "just get a new headunit". Props to you sir.
Bumping this since it was helpful for me while fixing my front left door lock actuator particularly the two posts quoted above. Since there are no step-by-step pictures, a lot of it you won't understand until you start disassembling the door.
One thing not mentioned in this thread is how to...
