SHARP _ LCD TV _ LC-32SH25E - No picture-Sound OK _ Troubleshooting

NO PICTURE ON THE DISPLAY

·          The picture doesn't appear in all modes.

MAIN UNIT

Is LVDS signal output from 1st_channel and 2nd_channel of IC U400 in each mode? (A0N/A0P),(A1N/A1P),(A2N/A2P),(A3N/A3P),(CLK1N/CLK1P). => NO => Check IC U400 and its peripheral control circuits

If Yes

Is the above-mentioned LVDS signals output to connector CN750? => NO => Check the line between IC U400 and CN750.

If Yes

Is LCD controller's control signal normal? => NO => Control signals BRIGHT_ADJ, INVERTER_ON_OFF, PANEL_VCC_ON/OFF, and it peels off and whether normality is checked.

If Yes [ PANEL UNIT]

Similarly, is the LVDS signal input to connector of the panel module?. => No => Wire harness is checked.

If Yes

Check the panel module.