LC-90LE740X
6 – 14
No video (4)
PC: No external input video [INPUT7]
Is the INPUT-7 selected on the input select menu screen?
YES
NO
Select INPUT-7 on the input select menu screen for the right input signal.
Is IC2601 (HDMI-SW) accessed by I2C, with PC connected, to read the VGA_SCL/SDA data?
Check the DDC-12C line and its peripheral circuits. (IC2601 and its peripherals).
Are there the video signal inputs at pins (AR24/AT24) (G), (AU24) (B) and (AR25) (R) of IC3301 (CPU)?
Are there the VSYNC/HSYNC signal inputs at pins (AM25) and (AN25) of IC3301?
YES
NO
Check the line between SC504 and IC3301, and their peripheral circuits.
Is the T-CON PWB connected?
VBO_LOCKN pin (40) of SC3801 become Low if there is no problem in the connection.
NO Check the T-CON PWB and harness.
Check IC3301 and SC3801 and their
peripheral circuits in Main PWB.
YES
Are the V-By-One HS signal input to the pin of SC3801?
VBO_CN_TXA+/- (36/37pin), VBO_CN_TXB+/- (32/33pin),
VBO_CN_TXC+/- (28/29pin), VBO_CN_TXD+/- (24/25pin).
NO Check IC3301 and its peripheral circuits.
(IC3501/IC3502/IC3503/IC3504, etc.)
YES
Check the panel module and harness.
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