How to open lg lcd flatron L1552S

SOURCE: LG Flatron LCD Power Saving Mode

Well thats seems tricky does it not come on at all when you boot the computer. If the screen is working then it should work to display the Start up screen. If it does then keep pressing Delete until the BIOS comes up- then search the pages for power saving and slect to OFF

SOURCE: LG Flatron L1550S power light blinks green.

shorted components on the circuit. send it to a repair shop if you don't have experience on electronic troubleshooting!!!

SOURCE: LG Flatron EZ T530S

Check your connector to your computer if that's good check the HOT if it's bad replace the HOT and flyback. Check the SMPS caps.

SOURCE: after starting, my monitor displays "power saving mode".

Go into the menu and reset the monitor to factory defaults.

SOURCE: why does my LG flatron 1953T LCD monitor (19') goes white

Because the fuse on scaler PCB is blown. Open the monitor, open metal cover, disconnect all cables coming between display and boards, take the chassis off the display.
On back side of display you will see metal cover, mounted with tiny screws, take them off. Unscrew the board also and carefully tilt it up. Observe tiny chip fuse (referenced F1 or FU1 or something with "F") somewhere nearby the connector, ring it, replace it with solder drop.
Take everything back together.