Sharp Aquos LC-42BX5H, Service Manual

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LC-42BX5H/M/X
6 – 6
With <Component> signal input No video onscreen (6)
No external input video onscreen <INPUT 4>, <INPUT 5>
Is INPUT 4, INPUT 5 selected on the input select menu screen?
NO Select INPUT 4 or INPUT 5 on the input select menu screen to
pick up the right input signal.
YES
Are there the signal inputs from the HDMI (SC402, SC403)
connector to the following input terminals of IC8702 (pin (5), (6),
(8), (9), (11), (12), (14), (15), (16), (17), (19), (20), (22), (23), (25),
(26)). NO With an HDMI device connected, is IC403, IC404 (EEPROM)
accessed by I2C and is the DDC I2C CLOCK/DATA data read?
YES
NO
Check IC403, IC404 and their peripheral circuits.
Are there the clock, H, V, Data signal outputs at pins (70) - (76),
(83) - (90), (96), (98), (99), (104) - (111) of IC8702, respectively? NO Check IC8702, IC8703 and their peripheral circuits.
YES
Are waveforms of the clock, H, V, and Data input and output
terminals of IC8401 normal? NO Check IC8401 and its peripheral circuits.
YES
Are there the signal outputs at pins U22, U23, V22, V23, P22,
P23, R22, R23, T22, T23 of IC801, respectively? NO Check IC801 and its peripheral circuits.
YES
Check LVDS cable, LCD controller (IN PANEL) and their periph-
eral circuits.