I just took out my charts that I have for LAX and the 4 approach frequencies ar 128.5---From the North,124.9---From the South,124.5----From the West, and 124.05---From the East.
Departures are Handled on 125.2 to the NW and 124.3 to the S-NE. I am not sure and have not confirmed usage of 134.9
Low altitude Center I have as 132.85,132.6,135.5,133.75,126.35, and 125.275 feeding in and out of LAX