[LancePearson]

Shrade, I don't have the unit in front of me but the total head unit by Delco consists of three boards/electronic controls including the cd and cassette mechanisms if memory serves...there is one horizontal on the floor of or somewhere innside the the metal case I think (memory here or it could all be the mechanism controlled by the side board.)..will see. There is a second vertical one on edge with its length the depth of the head unit when put into the dash behind the two incandescent bulbs on the left side as you look at it when the top and two sided metal case is removed. Then, on the separate approx 1/2" deep face unit is a third, or another, green circuit board which screws to the back of the face with all it's buttons and light distribution plastic "runners" in place. All you see when looking at the back is the soldered pins instead of what is on the other side. I haven't removed it again at this point but will in time. Between it, the buttons and the plastic face they all reside in are two pieces of clear plastic with white lines on them which I believe distribute the dash lights controlled by the dimmer to the entire face and when the lights come on for the car, parking or headlights, then the dimmer switch controls them and they show an orange light throughout my radio (the basic lighting schemel across my dash gauges). I think it is the two fairly powerful little incandescant bulbs on the vertical board on the left side which generates that light. Each of the buttons also has a green lcd or led that lights on demand as well. The lights show three types on the schematic: Incand, LED, LCD....and normally display screens are lcd types I think but I'm in over my head without it open and in front of me. Every single light function works fine save the backlighting for the 1/2" x 3-4" long display area which by definition has to be a more subtle light source and I believe does not come from the two incandescent bulbs on the left side of the h.u.

The metal case to which the completed face unit with it's green board screwed to it attaches clicking in with its separate board is the face mounted on the h.u. metal head box then. There are pieces of insulating material to keep that board from touching the metal case itself. I don't remember exactly what's under the face board itself but the one thing in the entire radio function not working at the moment is the display window backlighting which is more or less a constant though gets brighter if memory serves when the headlights are on as well. It can probably only be lit by a source on that face board just described. Without the headlights there is backlighting there normally and right now in mine it is not there. So, if it's the two Radio Shack 50 miliamp bulbs referred to in Alchemist's post I put up here then I'll see that when my new/used radio arrives and I substitute it in place. Then I'll take my current which will become a backup h.u. apart and see what is on the inside of the face's board. I'm no EE but what I've seen so far does not look like the board for the face unit. Maybe wrong and maybe I'll have to eventually send it to one of the radio tuners, dr. don or Bob, to let them do it but right now it's an interesting puzzle. I'll let you know when I get my new/used unit and put it in assuming it works correctly as purchased says it does.

We'll see. Not often I spend this much time on one thing. I just have the dash open in that area now as it's too cold to drive at the moment anyway. Sound is terrific when I do try it though.