Sharp LC-52D43U Service Manual - Page 30

LC-52D43U No video output (3) No video output from external input Is INPUT-3 selected on the input switching menu screen? Select INPUT-3 and the input signal on the input switching menu screen. NO When INPUT-3 cannot be selected since the characters INPUT-3 on the menu YES Is signal fed to each input terminal of IC501 (AV SWITCH)? Is video signal fed to pin 3 of IC501? Are Y and C signals fed to pins 5 and 7 of IC501 respectively? YES Is video signal sent to pin 60 of IC501? Are Y and C signals sent to pins 60 and 59 of IC501 respectively? YES Is video signal sent to pin 2 of TERMINAL_UNIT connector (FC_SC501)? Are Y and C signals sent to pins 2 and 4 of TERMINAL_UNIT connector (FC_SC501) respectively? YES Is video signal fed to pin 2 of MAIN_UNIT connector (FC_SC1101)? Are Y and C signals fed to pins 2 and 4 of MAIN_UNIT connector (FD_SC1101) respectively? YES Is video signal fed to pin K25 of IC8101 (Broadcom) via L.P.F. composed of Q2202 and Q2210? Are Y and C signals fed to pins k25 and L24 of IC8101 (Broadcom) via L.P.F. composed of Q2202 and Q2210 and via L.P.F. composed of Q2203 and Q2211 respectively? YES Are digital video (LVDS) signals sent from pins 37-42 and 45-48 of IC2602? Are digital video (COMOS) signal sent from IC8101 (DVODATA 0 ~ 23, DVOCLKO, DVODE, DVOHSYNC, DVOVSYNC)? YES Check LCD_CONTROL PWB. Is the video signal detection function normal? Check between J501 and pin 2 of IC501. Is the S-video signal detection function normal? Check between J503 and pin 42 of IC501. NO Check between J501 and pin 3 of IC501. NO Check between J503 and pins 5 and 7 of IC501. NO Check IC501 (AV SWITCH) and peripheral circuits. NO Check between IC501 and SC501. (Q501, Q502, Q503, Q504, etc.) NO Check the board-to-board cable "FC". NO Check between SC1101 and IC3301. (Q2202, Q2210, etc.)/ (Q2203, Q2211, etc.) NO Check IC2602 and peripheral circuits. NO Check IC8101 and peripheral circuits. 4 - 5