This business started in 2009 replacing broken MacBook displays. We bought new, Grade A LCD panels from LG and Samsung brokers, replaced only the broken LCD cell, and reused the rest of the display assembly. That kept part costs low and meant we could offer screen repairs at a fraction of Apple's price. The customer got a new panel, not a used one. We took pride in that.
That supply chain no longer exists. Apple has closed off LCD panel sales to independent repair shops. The standalone LCD panels still available for modern MacBooks are factory rejects with visible defects; dead pixels, discoloration, backlight bleed that we would not put into a customer's machine. We tried. The quality is not acceptable.
For current-generation MacBooks, the only quality option is a used display assembly pulled from another machine. These assemblies include parts you don't need (back cover, hinges, webcam, antenna cables), which raises the cost. The display will be used, not new.
So we stopped. We do not replace MacBook screens anymore. Fitting a used display assembly pulled off somebody else's machine, and charging real money for it, is not a job worth selling. If a display is what you need, CompuPLUS on North Lamar in Austin does that work, and we would rather send you there than take the job.
What stayed here is logic board repair, liquid damage recovery, and data recovery. That work needs a microscope, a soldering iron and schematics, not a parts order. Batteries, keyboards and trackpads are parts orders, which is why they went the same way as screens.