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LC-42BX5H/M/X
With <Component> signal input
No external input video onscreen <INPUT 1>
Is INPUT 1 selected on the input select menu screen?
Are there the Y, Pb and Pr signal inputs at pins (25), (1) and (5)
of IC3402 (Component SW), respectively?
Is input waveform of IC802 normal?
Y=U1pin, Sync=J2pin
Pb=L1pin, Pr=R1pin
Are there the signal outputs at pins U22, U23, V22, V23, P22,
P23, R22, R23, T22, T23 of IC801, respectively?
Check LVDS cable, LCD controller (IN PANEL) and their periph-
eral circuits.
With <Component> signal input
No external input video onscreen <INPUT 2>
Is INPUT 2 selected on the input select menu screen?
Are there the Y, Pb and Pr signal inputs at pins (27), (3) and (7)
of IC3402 (Component SW), respectively?
Is input waveform of IC802 normal?
Y=U1pin, Sync=J2pin
Pb=L1pin, Pr=R1pin
Are there the signal outputs at pins U22, U23, V22, V23, P22,
P23, R22, R23, T22, T23 of IC801, respectively?
Check LVDS cable, LCD controller (IN PANEL) and their periph-
eral circuits.
YES
YES
YES
YES
YES
YES
YES
YES
No video onscreen (4)
NO
Select INPUT 1 on the input select menu screen to pick up the
right input signal.
NO
Check the line between pins (10)/(6)/(4) of J3404 and pins (25)/
(1)/(5) of IC3402.
NO
Check IC3402 and its peripheral circuits.
NO
Check IC801 and its peripheral circuits.
No video onscreen (5)
NO
Select INPUT 2 on the input select menu screen to pick up the
right input signal.
NO
Check the line between pins (10)/(6)/(4) of J3404 and pins (27)/
(3)/(7) of IC3402.
NO
Check IC3402 and its peripheral circuits.
NO
Check IC801 and its peripheral circuits.
6 – 5
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