Sharp LC-60E77UN Service Manual page 53

PC: No external input video [INPUT-4]
Is INPUT-4 selected on the input select menu screen?
NO
Select INPUT-4 on the input select menu screen for the right input signal.
Is IC1809 (EEPROM) accessed by I2C, with PC connected, to read the DDC_I2C SCL/SDA data?
Check the DDC line and its peripheral circuits (IC1809 and its peripherals).
YES
Are there the video signal inputs at pins (AK16) (G), (AH15) (B) and (AK17) (R) of IC8001 (CPU)?
Are there the VSYNC/HSYNC signal inputs at pins (AJ14) and (AK14) of IC8001?
YES
Are the LVDS signal outputs at the LVDS 1st channel and 2nd channel of IC8001?
LVDS_TX_0_DATA0_P/N (C14/D14), LVDS_TX_0_DATA1_P/N (C15/D15),
LVDS_TX_0_DATA2_P/N (C16/D16), LVDS_TX_0_DATA3_P/N (C18/D18),
LVDS_TX_0_DATA4_P/N (C19/D19), LVDS_TX_0_CLK_P/N (C17/D17),
LVDS_TX_1_DATA0_P/N (A14/B14), LVDS_TX_1_DATA1_P/N (A15/B15),
LVDS_TX_1_DATA2_P/N (A16/B16), LVDS_TX_1_DATA3_P/N (A18/B18),
LVDS_TX_1_DATA4_P/N (A19/B19), LVDS_TX_1_CLK_P/N (A17/B17).
YES
Check the panel module.
LC-60E77UN/LC-65E77UM/LC-C6077UN/LC-C6577UM
No video (5)
NO
Check the line between SC1804 and IC8001 (IC1802, etc.).
NO
Check IC8001 and its peripheral circuits (IC8152/IC8153, etc.).
6 – 5