Denon AVR-S950H Series Service Manual

Also see for AVR-S950H Series: Owner's manual Owner's manual Quick start guide

Contents

When the results of check item (3-11.1.) are "00"(Detection of 5V is not OK)When the results of check item (3-11.2.) are "00 or 04"(Detection of DDC is not OK.)Check item(3-11.3.). Check the +5V voltage.Does "+5V" at the following test point indicate 5 V?N1007HDMI 7[CD]N1006HDMI 6[AUX2]N1004HDMI 4[GAME]N1003HDMI 3[Blu-ray]N1002HDMI 2[DVD]N1001HDMI 1[CBL/SAT]N1005HDMI 5[MEDIA PLAYER]+5V +5V +5V+5V +5V +5V+5VCheck item(3-11.4.). Check the DDC line :Are waveforms of "DDCSCK" and "DDCSDA" observed at the test point near the HDMI input terminal?N1007HDMI 7[CD]N1006HDMI 6[AUX2]N1004HDMI 4[GAME]N1003HDMI 3[Blu-ray]N1002HDMI 2[DVD]N1001HDMI 1[CBL/SAT]N1005HDMI 5[MEDIA PLAYER]DDCSCKDDCSDACheck the +5V voltage. (HDMI Rx) Check the DDC line. (HDMI Rx)HDMI Rx [U1000 or U1003] is faulty.Replace with a new device.Recheck from check item (3.2.).If it does not work, replace the PCB.HDMI Rx [U1000 or U1003] is faulty.Replace with a new device.Check for a short circuit in the 5 V line and the 5V Switch IC [U1002].If there is no problem, the HDMI Rx [U1000 orU1003] or the 5 V Switch IC [U1002] is faultyReplace with a new device.Check for a short circuit in the DDC line.If there is no problem, the HDMI Rx1 [U1000] orHDMI Rx2 [U1003] is faulty.Replace with a new device.Recheck from check item (3.2.).If it does not work, replace the PCB.YES NO YES NOless than 100KHz5V5VThis diagram shows an example of the DDC communica-tion waveform.-The high level voltage is 5V.-The frequency of the DDC CLK is 100 KHz or less.Check at each test point.Voltage scale：2.0V/divTime scale：40us/divBefore ServicingThis Unit Electrical Mechanical Repair Information Updating109