Sharp LC46D43U Service Manual - Page 28
Check between IC501 and SC501. Q501, Q502, etc.
UPC - 890552648849
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LC-42D43U No video output (1) No video output from external input Is INPUT-1 selected on the input switching menu screen? Select INPUT-1 and the input signal on the input switching menu screen. NO When INPUT-1 cannot be selected since the characters INPUT-1 on the menu screen are gray. YES Is video signal fed to pin 65 of IC501 (AV SWITCH)? Is the video signal detection function normal? Check between J501 and pin 70 of IC501. NO Check between J501 and pin 65 of IC501. YES Is video signal sent to pin 60 of IC501? NO Check IC501 (AV SWITCH) and peripheral circuits. YES Is video signal sent to pin 2 of TERMINAL_UNIT connector (FC_SC501)? YES Is video signal fed to pin 2 of MAIN_UNIT connector (FC_SC1101)? YES Is video signal fed to pin K25 of IC8101 (Broadcom) via L.P.F. composed of Q2202 and Q2210? 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. NO Check between IC501 and SC501. (Q501, Q502, etc.) NO Check the board-to-board cable "FC". NO Check between IC501 and IC3301. (Q2202, Q2210, etc.) NO Check IC2602 and peripheral circuits. NO Check IC8101 and peripheral circuits. 4 - 3