Sharp Aquos LC 32D50U, Service Manual

Page: 38 / 164

LC-32D50U
6 – 7
<Component video signal input> No video output (3)
No video output from external input <<INPUT-1>>
Is INPUT-1 selected on the input switching menu screen?
NO Select INPUT-1 and the input signal on the input switching menu
screen.
YES
When INPUT-1 cannot be selected since the characters INPUT-1
on the menu screen are gray.
Is the component video signal detection function normal? Check
between pin 8 of J501 and pin 38 of IC501.
Are component video signals fed to pins 21, 23 and 25 (Y, PB
and PR) of IC501(AV SWITCH)? NO Check between J1501 and each input pin of IC501.
YES
Are Y, PB and PR signals sent to pins 60, 59 and 58 of IC501
respectively? NO Check IC501 and peripheral circuits.
YES
Are component video signals sent to pins 2, 4 and 6 of IF_UNIT
connector (FC_SC501)? NO Check between IC501 and SC501. (Q501-Q506, etc.)
YES
Are component video signals fed to pins 2, 4 and 6 of
MAIN_UNIT connector (FC_SC1101)? NO Check the board-to-board cable "FC".
YES
Are Y, Pb and Pr signals fed to pins 246, 232 and 225 of IC3301
(Trident) respectively? NO Check between SC1101 and IC3301. (Q2202, Q2203, Q2206,
etc.)
YES
Are digital video (LVDS) signals sent from pins 28-31 and 34-37
of IC3301? NO Check IC3301 and peripheral circuits.
YES
Check LCD_CONTROL PWB.