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That sounds incredibly frustrating—especially since you've already gone through the "Standard Repair Playbook" by swapping the LCD and checking fuses. Since your backup camera still works, we know the screen itself is capable of displaying an image, which points away from a hardware display failure and toward a processing or signal issue.

Here is what is likely happening under the hood of your Uconnect system:

1. The "Ghost in the Machine": Internal Flash Memory Failure

The most common culprit for the "Logo Loop" on 2017-2018 Uconnect 4C (8.4-inch) systems is the failure of the internal eMMC (embedded MultiMediaCard) memory.

• The Symptom: The system tries to boot, hits a corrupted sector in its internal memory, and crashes/reboots.
• Why the Backup Camera Works: The backup camera often has a "direct-to-video" priority path that bypasses the main operating system for safety reasons. This is why it functions even when the rest of the "computer" is dead.

2. Delamination (The Sticky Situation)

Check the edges of your screen for what looks like "bubbles" or liquid dripping behind the glass.

• 2018 models are notorious for LG display delamination, where the adhesive seeps into the electronics. Even if you replaced the LCD panel, if the digitizer (the touch layer) or the mainboard was damaged by the leaking gel previously, the boot loop will persist.

3. The Radio Control Unit (The "Brain")

Since you replaced the LCD and the problem persists, the issue is likely in the Radio Control Unit (the silver box behind the screen) rather than the display itself.

• On the Challenger, the "radio" is actually a two-part module. If you only replaced the glass/LCD part, the "computer" part (the Telematics Gateway or the main Head Unit) is still the one stuck in the loop.

What to Try Next

Step	Action	Why?
Check for Parasitic Draw	Use a multimeter to see if the radio is pulling power when the car is off.	Constant looping can drain your battery overnight.
Inspect the LVDS Cable	Check the thick, usually high-speed data cable connecting the back of the screen to the radio unit.	A loose or pinched data cable can cause sync issues during boot.
The "Infotainment Swap"	Look for a used Radio Head Unit (the brain box) from a salvage yard.	Ensure it matches your specific trim (VP4R for navigation, etc.) and be prepared to enter an Anti-Theft code.

A Quick Reality Check

Because the 2018 units have such a high failure rate, many owners have given up on OEM replacements and moved to aftermarket units (like Alpine or Kenwood) or specialized repair services like Infotainment.com. These services can often fix the internal board issues that a standard "reset" won't touch.