Sharp LC-32AX5H Service Manual page 25

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 periferal
circuits.
With <Component> signal input
No external input video onscreen <INPUT 3>
Is INPUT 3 selected on the input select menu screen?
Are there the signal inputs from the HDMI (SC403) connector to
the following input terminals of IC8702 (pin (16), (17), (19), (20),
(22), (23), (25), (26)).
Are there the clock, H, V, Data signal outputs at pins (71) - (78),
(83) - (90), (96), (98), (99), (104) - (111) of IC8702, respectively?
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 (3)
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 (4)
NO Select INPUT 3 on the input select menu screen to pick up the
right input signal.
NO With an HDMI device connected, is IC404 (EEPROM) accessed
by I2C and is the DDC I2C CLOCK/DATA data read?
Check IC404 and their peripheral circuits.
NO Check IC8702, IC8703 and their peripheral circuits.
NO Check IC801 and its peripheral circuits.
6 – 3
LC-32AX5H/M/X
NO