Troubleshooting guide in PDF for the TP.SK508S.PB802 universal TV mainboard, a common board family used in many budget LCD and LED sets. Guides of this sort usually walk through symptoms such as no power, no backlight or no picture, list test voltages and point to the relevant circuit blocks. It reads in any PDF viewer and is handy when no brand-specific service manual exists. Confirm the exact board code printed on your PCB and note that firmware for these boards is often tied to the panel resolution.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @pdf_servicemanual. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.