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.
Check for a short circuit in the DDC line.
If there is no problem, the HDMI Tx
[
U3401
] is faulty.
Replace with a new device.
When the results of check item (66) are "
30
"
(Detection of HPD is OK / Detection of RXSENSE is OK )
Check item(67).
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 first eight bytes of the returned value "
00FFFFFFFFFFFF00
"?
Check item(68).
Checking the TMDS :
Check the TMDS waveform at the following test
point.
N3402
HDMI OUT
[MONITOR1]
D2+ D2- D1+ D1- D0+ D0- CK+ CK-
Check item(69).
Check the communication :
Are the waveforms for "
CKL
" and "
DATA
" at the
test point near the HDMI output connector
[
N3402
] correct (as shown in the figure)?
N3402
HDMI OUT
[MONITOR1]
DDCSCK
DDCSDA
Checking the EDID register. (HDMI OUT1)
NO
YES
NO
NO
YES
Example
The first eight bytes are nor-
mally "
00FFFFFFFFFFFF00
".
The correct resistor value can-
not be checked if the AVR and
TV are not connected by HDMI.
m_1
YES
NO
less than 100KHz
5V
5V
This diagram shows an example of the DDC communica-
tion 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
TMDS Signal
3.3V
TMDS
Example of waveform in check ① Example of waveform in check ②
Voltage scale : 1.0V/div Voltage scale : 1.0V/div
Time scale : 20ms/div Time scale : 1s/div
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
124
