Example
The first eight bytes are normally
"00FFFFFFFFFFFF00".
*If the AVR and the TV are not con-
nected via HDMI, the correct register
value cannot be verified.
When the results of check item (73) are "
03
"
(Detection of HPD is OK / Detection of RXSENSE is OK )
Check item(74).
Check the Monitor EDID :
① Unplug the AC cord. Plug the AC cord into a power outlet.
② Send the transmission command "
m_2
" from Termite.exe.
Are the first eight bytes of the returned value "
00FFFFFFFFFFFF00
"?
Check item(75).
Checking the TMDS :
Check the TMDS waveform at the following test
point.
N3401
HDMI OUT
[MONITOR2]
D2+ D2- D1+ D1- D0+ D0- CK+ CK-
Check item(76).
Check communication with the
monitor :
Are waveforms of "
DDCSCK
" and "
DDCSDA
"
observed at the test point near the HDMI output
terminal [
N3401
]?
N3401
HDMI OUT
[MONITOR2]
DDCSCK
DDCSDA
Checking the EDID register. (OUT2)
HDMI Tx [
U3401
] is faulty.
Replace with a new device.
Recheck from
check item (4).
If it does not work, replace the PCB.
HDMI Tx [
U3401
] is faulty.
Replace with a new device.
Check for a short circuit in the TMDS line.
If there is no problem, the HDMI Tx
[
U3401
] is faulty.
Replace with a new device.
HDMI Tx [
U3401
] is faulty.
Replace with a new device.
NO
YES
NO
YES
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 100kHz or less.
Check at each test point.
Voltage scale : 2.0V/div
Time scale : 40us/div
YES
NO
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
128
