The iPad Pro is known for no touch issues after screen replacements and that’s only if the battery is still connected and charged.
“Always disconnected the battery”
There are backlight filters which get damaged or burnt near the LCD FPC Connector even if the iPad is powered down.
How Do We Repair Them?
First, we remove the blown filters like the one in the picture above
then if the pads which the filter connects to are also damaged, we make micro jumpers from the nearest component or where the trace is exposed.
then we place and solder new filters on to the logicboard.