Datasheet in PDF form for the graphic LCD module with part number PG256128FRM-ANN-C, a 131 KB document. In this style of module numbering the digits usually give the dot matrix, here 256 by 128 pixels, while the suffix letters encode backlight, viewing mode and variant options. Use it to confirm the connector pinout, supply and LCD drive voltages, controller interface timing and outline dimensions before fitting or replacing a display. Compare the suffix on the module label carefully, since variants can differ in backlight and voltage.
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 @acodis_lcd_datasheets_EDID. Enginerys does not host this file.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.