Backlight circuit schematic for the Samsung SM-A21s, a 3.82 MB PDF. It covers the LCD light section, typically the backlight driver, its boost inductor and diode, and the lines to the display connector. Use it when the image is faintly visible but the screen stays dark: measure the backlight output voltage, check the coil and diode, and test for shorts on the boost line. Opens in any PDF viewer. Confirm the board is an SM-A21s before relying on the component designators.
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 @phoneSchematics. 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.