Service package for the LG X155 phone, with SVC indicating service manual content such as schematics, board layouts, troubleshooting flowcharts and parts lists. The 6.10 MB RAR is useful for diagnosing no-power, charging or display faults and for identifying components on the main board. Unpack it and open the documents in a standard PDF viewer. LG often released one service manual for several regional variants, so check that the model number on your device is X155 before trusting test values and part references.
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 @SMART_PHONE_SCHEMATICS. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.