Here are your parts
Model LER4634JQ1

Here is a wiring diagram
https://www.servicematters.com/d...0Sheet%20-%208528187.pdf

Breaker is fine and dryer has power.
Did you measure L1 to L2 (240 volts), also L1 to Neutral and L2 to Neutral (120 volts)

Lifted dryer top and checked door switch, No power to switch.
Removed back panel to control console, No power to start button.
Measuring from where to where

Checked power to timer, OK.
Is this across the motor ? Again where to where?
Timer motor should not have power unless the main motor is running.

Pulled rear dryer panel and checked for volatge at motor. OK.
Where to where, cannot be OK or the motor would run unless your motor is shot.

It is obviouse that in order for the motor to work it has to recieve power from the timer to engage the motor?
Is roblem at timer?
Cannot tell from your description, possible but unlikely.

A common cause is the thermal fuse in the motor circuit.
Item 19 in Section 3
Unplug the machine
Pull one wire from the fuse
Measure across it
Should be 0 ohms
If open replace

If you do not have a multimeter (ohmmeter)
Unplug the machine
Short the two wires from the machine together
Tape them up so they cannot short to the frame
And give it a try
If it now runs replace the fuse ASAP as it is a safety device.

If it was the fuse give the interior a good cleaning/check including the blower wheel. Also clean/check your vent system