There are a few things you can check on the tree. Probably best to start with a rundown of how the tree is constructed from an electrical standpoint.
There are four sets of stage/prestage/yellow/green/red LED circuit boards in the tree, one set for the driver facing left, one set for the driver facing right, another set for the downtrack facing left and the fourth set for the downtrack facing right. Each of these sets of lights are wired to the tree electronics in the bottom of the tree via interconnect cables. If this was a wireless tree, there is also a coaxial antenna cable connected front the antenna at the top to the tree electronics in the bottom of the tree.
The interconnect cables carry power and signals to each set of LED circuit boards. Some are shared control signal connected to all four boards and some signals are shared data signals between both sets of boards on the left side or both sets of boards on the right side. Power (approximately 15VDC) and ground are connected to all 4 sets. Pulling the tree electronics out of the tree gains access to these interconnect cables.
To remove the tree electronics from the tree, remove three screws holding the bottom plate of the tree in place as shown in Figures 1 and 2.
- Figure 1
- Figure 2
The four cables are grouped as two for the left side and two for the right side and indicated on the tree electronics circuit board between the connectors as LEFT or RIGHT. Unplug each of the connectors and mark them as 1 through 4 so they can be plugged back in where they came from when done troubleshooting.
Plugging in each cable one at a time and powering on the tree will help troubleshoot if one set of lights is failing and causing another set or sets to appear to fail. Of course, only one set of lights will illuminate on the tree dependent on which cable was plugged in. For future troubleshooting, you could note which cable connects to which sets as front left, front right, rear left and rear right.
If this troubleshooting does not resolve the problem, next step would be to check the connection of the other end of each cable. Reaching your arm up into each side of the tree about halfway up, the cable terminates connected to a light set with the same type of connector. The cable is routed through the metal to the circuit board on the other side of the metal. Insure each cable is tight as best you can. If you can isolate down to a single cable or sets of lights, these can be removed or replaced with some additional dissasembly.
The DTSS and the SST are wired the same with the exception of there are only the front driver facing lights are in the SST model of LED tree.