Marantz AV7703 Service Manual page 125

When the results of check item (77) are "YES"
(When the menu display is OK)
HDMI
Turn Video Conversion "ON" on the setup menu.
(SETUP MENU-> Video-> Output Settings-> Video Conversion = On)
In order to check, connect the player to the HDMI terminal and configure the player as AVR source.
Next, turn on the power for the player and TV and start playback on the player.
Check the Video signal line. (HDMI Tx -> GUI)
Check the Video signal line. (HDMI Tx -> PLD)
IN1 HDMI OUT1
Check item(81). Check the HDMI Tx video signal line from the HDMI
Tx :
Check the video signal waveform at the following test point.
Is the waveform like the sample?
TP(HO_DE)
IC421
Check the peripheral pattern between the HDMI Tx (IC431) and PLD (IC421).
If there is no problem, the HDMI Tx (IC431) is faulty.
Replace with a new device.
Recheck from check item (6).
If it does not work, replace the PCB.
Check the Video signal line. (PLD -> GUI)
Check item(82). Check the GUI video signal line from the PLD :
Check the video signal waveform at the following test point.
Is the waveform like the sample?
IC421
TP(8KI_DE)
YES
The GUI (IC401) is failure.
Replace with a new device.
Recheck from check item (6).
If it does not work, replace the PCB.
125
3.3V
Example of waveform in check ①
3.3V
Example of waveform in check ②
NO
3.3V
Example of waveform in check ①
3.3V
Example of waveform in check ②
NO
Check the peripheral pattern between the PLD
(IC421) and GUI (IC401).
If there is no problem, the PLD (IC421) is faulty.
Replace with a new device.