Denon DRA-800H Service Manual page 93

3-9. OSD [ADV7623] failure detection procedure
Checking the TMDS status register (OSD -> HDMI Rx/Tx)
Check item(3-9.1.). Check the TMDS CLK detection status of the
register.
Send the following command from Termite.exe.
Send the command "i 0006 00FF 0001".
When the following value is returned, go to Yes.
"C8"
When the following value is returned, go to No.
"other"
YES
Check the connection between the HDMI OUT terminal and the TV.
Go to check item (3-9.3.).
Recheck from check item (3.3.).
If it does not work, replace the PCB.
Check item(3-9.2.).
Example
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
HDMI SW [IC721]
i 0006 00FF 0001
NO
HDMI Rx/Tx [IC721] is faulty.
Replace with a new device.
93
Checking the TMDS input waveform. :
42/43/45/46/48/49/51/52pin
IC721
YES
OSD [IC731] is faulty.
Replace with a new device.
3.3V
TMDS Signal
Example of waveform in check ①
Voltage scale：1.0V/div
Time scale：20ms/div
TMDS
Example of waveform in check ②
Voltage scale：1.0V/div
Time scale：1s/div
NO