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 (37) are "22"
(Detection of DDC is OK.)
Check item(40). Checking register of the TMDS CLK detection status
register :
Send the following command from Termite.exe.
HDMI Rx/Tx
Send the command "i 002E 00FF 0001".
When the following value is returned, go to Yes.
HDMI In1 "44" HDMI In2 "22" HDMI In3 "11"
When the following value is returned, go to No.
HDMI In1 "00" HDMI In2 "00" HDMI In3 "00"
Check item(42). Checking register of the TMDS CLK detection status
register :
Send the following command from Termite.exe.
Send the command "i 0006 00FF 0001".
When the following value is returned, go to Yes.
"CC or 44"
When the following value is returned, go to No.
"other"
Check item (41). Checking the TMDS input waveform. :
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
HDMI In3
137/138/140/141/143/144/146/1
47pin
HDMI In2
124/125/127/128/130/131/133/1
34pin
HDMI In1
83/84/86/87/89/90/92/93pin
IC720
Checking the TMDS status register (HDMI SW)
Checking the TMDS status register (HDMI SW -> HDMI Rx/Tx)
Example
i 002E 00FF 0001
Example
i 0006 00FF 0001
Check for a short circuit in the pattern of the
TMDS line of the HDMI SW [IC701] from the HDMI
input terminal.
If there is no problem, the HDMI SW [IC701] is
faulty.
Replace with a new device.
HDMI SW [IC701] is faulty.
Replace with a new device.
Recheck from check item (2).
If it does not work, replace the PCB.
YES
YES
YES NO
NO
NOYES
Check item (43). Checking the TMDS input waveform. :
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
55/56/58/59/61/62/64/65pin
IC721
TMDS Signal
3.3V
Example of waveform in check ①
Voltage scale：1.0V/div
Time scale：20ms/div
TMDS
Example of waveform in check ②
Voltage scale：1.0V/div
Time scale：1s/div
HDMI Rx/Tx[IC721] is faulty.
Replace with a new device.
HDMI SW [IC701] is faulty.
Replace with a new device.
95
Caution in
servicing
Electrical Mechanical Repair Information Updating
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