HDMI Tx (
IC431
) is faulty.
Replace with a new device.
Recheck from
check item (5).
If it does not work, replace the PCB.
HDMI Tx (
IC431
) is faulty.
Replace with a new device.
Check for a short circuit in the TMDS line.
If there is no problem, the HDMI Tx
(
IC431
) is faulty.
Replace with a new device.
Check for a short circuit in the DDC line.
If there is no problem, the HDMI Tx
(
IC431
) is faulty.
Replace with a new device.
When the results of check item (43) are "
30
"
(Detection of HPD is OK / Detection of RXSENSE is OK )
Check item(45).
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(46).
Checking the TMDS :
Check the TMDS waveform at the following test
point.
JK431
D2+ D2- D1+ D1- D0+ D0- CK+ CK-
Check item(47).
Check the communication :
Are the waveforms for "
CLK
" and "
DATA
" at the
test point near the HDMI output terminal (
JK431
)
correct (as shown in the figure)?
JK431
DDCSCK
DDCSDA
Checking the EDID register. (HDMI OUT)
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 100 KHz or less.
Check at each test point.
TMDS Signal
3.3V
TMDS
Example of waveform in check ① Example of waveform in check ②
119
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servicing
Electrical
Mechanical
Repair Information
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