LG 21SA1RL-T8E No video, No Raster, Sound ok ,menu and volume display on the screen

Fault:No video,No Raster, sound ok. But when press button "menu","volume", "ch"  display on the screen 
Ic No: TDA12011PQ/N1F00
Model No:LG 21SA1RL-T8E
Chassi No: CW62E

Solution: Check these parts: R408, R415, R416, R417, R534, R547, R548, C530, C571, C572, D502, Q502