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
When the results of check item (3-14.2.) are "
22 or 11
"
(Detection of DDC is OK.)
Check item(3-14.5.).
Checking register of the TMDS CLK detection sta-
tus register :
Send the following command from Termite.exe.
Send the command "
i 002E 00FF 0001
".
When the following value is returned, go to YES.
HDMI IN5 "
C4
", HDMI IN6 "
A2
", HDMI IN7 "
91
"
When the following value is returned, go to NO.
HDMI IN5 "
C0
", HDMI IN6 "
A0
", HDMI IN7 "
90
"
Check item(3-14.7.).
Checking the TMDS input waveform. :
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
HDMI IN5
55/56/58/59/61/62/64/65 pin
HDMI IN6
80/81/83/84/86/87/89/90 pin
HDMI IN7
93/94/96/97/99/100/102/103 pin
U2401
Checking the TMDS status register (HDMI Switcher1)
Example
i 002E 00FF 0001
Check for a short circuit in the pattern of the
TMDS line of the HDMI Switcher1 [
U2401
] from
the HDMI input terminal.
If there is no problem, the HDMI Switcher1
[
U2401
] is faulty.
Replace with a new device.
HDMI Switcher1 [
U2401
] is faulty.
Replace with a new device.
Recheck from
check item (3.2.)
If it does not work, replace the PCB.
YES
NO
NO
YES
Check item(3-14.6.).
Check the HPD and RXSENSE register value
of the device.
Send the following command from Termite.exe.
Send the command "
i 0028 0040 0001
".
Check the value.
Move to the branch destination according to the value returned.
Checking the HPD/RXSENSE status register. (HDMI ZONE2 OUT)
Example
If it is normal, "
33
" is returned.
The correct resistor value cannot be
checked if the AVR and TV are not
connected by HDMI.
i 0028 0040 0001
33
"
31 or 21 or 11 or 01
"
(Detection of HPD is OK / Detection of RXSENSE is not OK )
"
33 or 23 or 13 or 03
"
(Detection of HPD is OK / Detection of RXSENSE is OK )
"
32 or 22 or 12 or 02
"
(Detection of HPD is not OK / Detection of RXSENSE is OK )
"
30 or 20 or 10 or 00
"
(Detection of HPD is not OK / Detection of RXSENSE is not OK )
Go to
check item (3-14.11.)
Go to
check item (3-14.8.)
Go to
check item (3-14.12.)
Go to
check item (3-14.13.)
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
120
