HDMI Switcher1 (
IC391
) is faulty.
Replace with a new device.
Recheck from
check item (3).
If it does not work, replace the PCB.
HDMI Switcher1 (
IC391
) is faulty.
Replace with a new device.
Check for a short circuit in the TMDS line.
If there is no problem, the HDMI Switch-
er1 (
IC391
) is faulty.
Replace with a new device.
Check for a short circuit in the DDC line.
If there is no problem, the HDMI Switch-
er1 (
IC391
) is faulty.
Replace with a new device.
When the results of check item (19) are "
33 or 23 or 13 or 03
"
(Detection of HPD is OK / Detection of RXSENSE is OK )
Check item(20).
Check the Monitor EDID :
① Unplug the AC cord. Plug the AC cord into a power outlet.
② Send the transmission command "
m_3
" from Termite.exe.
Are the first eight bytes of the returned value "
00FFFFFFFFFFFF00
"?
Check item(21).
Checking the TMDS :
Check the TMDS waveform at the following test
point.
JK394
D2+ D2- D1+ D1- D0+ D0- CK+ CK-
ZONE2
Check item(22).
Check the communication :
Do "
CK
" and "
DA
" indicate (
5V
) at the test point
near HDMI output connector (
JK394
)?
JK394
DDCSCK
DDCSDA
ZONE2
Checking the EDID register. (HDMI ZONE2 OUT)
YES
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_3
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
108
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating
