: Tracing the display connector pins on the schematic can help solve "no backlight" or distorted image issues. Where to Find Schematic Diagrams
Yes. In most jurisdictions (including the US and EU), owning a schematic diagram for a product you own for repair purposes falls under laws. However, redistributing copyrighted HMD Global schematics for profit is illegal. Keep the file for personal or internal shop use. nokia 7 plus schematic diagram
If the speaker or headphone jack fails, technicians check the signal paths through the audio codec and amplifier. Technical Specifications for Reference Nokia 7 Plus Teardown - MyFixGuide : Tracing the display connector pins on the