Pc: No External Input Video - Sharp LC-52LE640U Service Manual

PC: No external input video [INPUT-8]
Is INPUT-8 selected on the input select menu screen?
NO
Select INPUT-8 on the input select menu screen for the right input signal.
Is IC1504 (HDMI switch) accessed by I2C, with PC connected, to read the VGA_SCL/SDA data?
Check the DDC line and its peripheral circuits. (IC1504 and its peripherals).
YES
Are there the video signal inputs at pins (AK15) (G), (AK13) (B) and (AM15) (R) of IC3303 (CPU)?
Are there the VSYNC/HSYNC signal inputs at pins (AM13) and (AL13) of IC3303?
YES
Is the T-CON PWB connected?
VBO_HTPDN (40pin), VBO_LOCKN (39pin) of P2604 become Low if there is no problem
in the connection.
YES
Are the V-By-One signal input to the pin of P2604?
VBO_CN_TXA+/- (36/37pin), VBO_CN_TXB+/- (32/33pin),
VBO_CN_TXC+/- (28/29pin), VBO_CN_TXD+/- (24/25pin).
YES
Check the panel module and harness.
LC-52/60/70LE640U,C6400U (1st Edition)
No video (4)
NO
Check the line between SC501 and IC3303.
NO
NO
6 – 10
Check the panel module and harness.
Check IC3303 and its peripheral circuits.
(IC3501/IC3502/IC3503, etc.)