1.2 No Sound1) Main board1. Check that the PC/AV switching signal is correct.Pins 10 and 11 of IC5001 ...................AV : L, PC : H2. Check that audio signal is observed at following points.Pins 11-12(PC)/13-14(AV) of K10B/K50B3. Check that the MUTE signal is correct.Pin 5 of K5A .......................................Mute-On: H4. Check that the MUTE signal is correct.Pin 12 of IC1803 ................................Mute-On: L5. Check that the PC/AV switching signal is correct.Pin 16 of IC1804 ................................AV : L, PC : H2) Audio board1. Check that sound volume control signal is correct.Pin 4 of IC0012. Check that audio signal is observed at pin 2 of IC001.3. Check the MUTE signal at pin 3 of IC001.Pin 3 of IC001 ....................................Mute-On: H4. Check that Vcc-voltage(+12V) is applied at pins 1 and 9 of IC001.Part 4: Troubleshooting4-6Fig. 4-2PC/AVSUDIOSWIC5001AV BOARDAUDIO BOARDMAIN BOARDQ5007SP901SPEAKERLR1532416121613121614412468132810,1111321214Q5008PC/AV-SWQ1801AUDIOOUTPUTIC001BUFFERIC851DACIC431I/OEXPAND .IC1804I/OEXPAND .IC1803I/OEXPAND .IC1806SYSTEMCONTROL&SCAN CONV.IC301AUDIO INAUDIOOUTPC LPC RAV LAV RLRVOLAUDIODACSDATASCLKDACSDATASCLKMUTE MUTEQ5041Q5001Q5003Q5002Q5004Q5042BUS
