Sharp LC-22DC30M Service Manual page 27

With <Component> signal input
No external input video onscreen <INPUT 3>
Is INPUT 3 selected on the input select menu screen?
Are there the Y, Pb and Pr signal inputs at pins (34), (36) and
(38) of IC3301 respectively?
Is input waveform of IC3301 normal?
Y=(36) pin, Pb=(34) pin, Pr=(38) pin
Check LVDS cable, LCD controller (incl. panel) and their periph-
eral circuits.
With <HDMI> signal input
No external input video onscreen <INPUT 1>.
Is INPUT 1 selected on the menu screen?
Are there signal outputs from SC1501 to IC3301?
Are there signal outputs of IC3301?
Check LVDS cable, LCD controller (incl. panel) and their periph-
eral circuits.
No video onscreen (3)
YES
YES
YES
No video onscreen (4)
YES
YES
YES
NO Select INPUT 3 on the input select menu screen to pick up the
right input signal.
NO Check the line between pins (19)/(17)/(15) of J502 and pins (34)/
(36)/(38) of IC3301.
NO Check IC3301 and its peripheral circuits.
NO Select INPUT 1 on the input select menu screen to pick up the
right signal input.
NO Check peripheral circuits between SC1501 and IC3301.
NO Check IC3301 and its peripheral circuits.
6 – 3
LC-22DC30M