Hdmi Sw Ic [Tmds261B] Failure Detection Procedure - Denon AVR-S950H Series Service Manual

3-15. HDMI SW IC [TMDS261B] failure detection procedure

Checking the TMDS status register (HDMI SW -> GUI)
Check item(3-15.1.). Check the TMDS CLK detection status of the
register.
Send the following command from Termite.exe.
Send the command "i 00E2 0004 0001".
When the following value is returned, go to Yes.
"02"
When the following value is returned, go to No.
"other"
NO
Check item (3-15.2.). Checking the TMDS input. :
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
U1026
YES
GUI [U1026] is faulty.
Replace with a new device.
Recheck from check item (3.5.).
If it does not work, replace the PCB.
Example
YES
GUI [U1026] is faulty.
Replace with a new device.
Recheck from check item (3.5.)
If it does not work, replace the PCB.
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
HDMI SW(U1103) is faulty.
Replace with a new device.
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