Example
The rst eight bytes are normally
"00FFFFFFFFFFFF00".
*If the AVR and the TV are not con-
nected via HDMI, the correct register
value cannot be veried.
m_1
When the results of check item (45) are "30"
(Detection of HPD is OK / Detection of RXSENSE is OK )
Check item(46). Check the Monitor EDID :
① Unplug the AC cord. Plug the AC cord into a power outlet.
② Send the transmission command "m_1" from Termite.exe.
Are the rst eight bytes of the returned value "00FFFFFFFFFFFF00"?
Check item(47). Checking the TMDS. :
Check the TMDS waveform at the following test
point.
HDMI OUT
CK- D0- D1- D2-
CK+ D0+ D1+ D2+
Check item(48). Check communication with the
monitor :
Are waveforms of "DDCSCK" and "DDCSDA"
observed at the test point near the HDMI output
terminal(JK751)?
HDMI OUT
DDCDATADDCCLK
Checking the EDID register (Monitor)
The HDMI Rx/Tx (IC721) is faulty.
Replace with a new device.
Recheck from check item (3).
If it does not work, replace the PCB.
The HDMI Rx/Tx (IC721) is faulty.
Replace with a new device.
Check for a short circuit in the TMDS line.
If there is no problem, the HDMI Rx/Tx
(IC721) is faulty.
Replace with a new device.
The HDMI Rx/Tx (IC721) is faulty.
Replace with a new device.
NOYES NOYES
less than 100KHz
5V
5V
This diagram shows an example of the DDC commu-
nication waveform.
-The high level voltage is 5V.
-The frequency of the DDC CLK is 100 KHz or less.
Check at each test point.
YES NO
92
Caution in
servicing
Electrical Mechanical Repair Information Updating
To Next Page
Loading...
Need help?
General
