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 (3-11.2.) are "22"
(Detection of DDC is OK.)
Check item(3-11.5.). Checking register of the TMDS CLK detection sta-
tus register :
Send the following command from Termite.exe.
HDMI Rx1 (When checking HDMI inputs 1, 2, and 3)
Send the command "i 002E 00FF 0001".
Rx2 (When checking HDMI inputs 4, 5, 6, and 7)
Send the command "i 0056 00FF 0001".
When the following value is returned, go to Yes.
HDMI IN1 "44" HDMI IN2 "22" HDMI IN3 "11" HDMI IN4 "88" HDMI IN5
"44" HDMI IN6 "22"HDMI IN7 "11"
When the following value is returned, go to No.
HDMI IN1 "40" HDMI IN2 "20" HDMI IN3 "10" HDMI IN4 "80" HDMI IN5
"40" HDMI IN6 "20" HDMI IN7 "10"
Check item(3-11.7.). Checking the audio signal output :
Check the audio signal waveform at the following test point.
Is the waveform like the sample?
HDMI Rx1 [U1000]
(When checking HDMI inputs
1, 2, and 3)
HDMI Rx2 [U1003]
(When checking HDMI inputs
4, 5, 6, and 7)
129/131/132/133/134/135/136 pin
U1000
U1003
Check item(3-11.6.). Checking the TMDS input waveform. :
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
HDMI Rx1 [U1000]
(When checking HDMI inputs 1, 2, and
3)
HDMI Rx2 [U1003]
(When checking HDMI inputs 4, 5, 6,
and 7)
HDMI IN3/7
93/94/96/97/99/100/102/103 pin
HDMI IN2/6
80/81/83/84/86/87/89/90 pin
HDMI IN1/5
55/56/58/59/61/62/64/65 pin
HDMI IN4
42/43/45/46/48/49/51/52 pin
U1000
U1003
Checking the TMDS status register
Example
i 002E 00FF 0001
Check for a short circuit in the pattern of the
TMDS line of the HDMI Rx [U1000 or U1003] from
the HDMI input terminal.
If there is no problem, the HDMI Rx [U1000 or
U1003] is faulty. Replace with a new device.
HDMI Rx [U1000 or U1003] is faulty.
Replace with a new device.
Recheck from check item (3.2.).
If it does not work, replace the PCB.
The digital audio block is faulty.
Check the digital audio device.
Check "AUDIO" in troubleshooting.
If it does not work, replace the PCB.
HDMI Rx [U1000 or U1003] is faulty.
Replace with a new device.
YES
YES NO
NO
NOYES
3.3V
The diagram shows an example of the wave-
form of pin 129. (I2S0 Data)
Waveform check points
- Crest value (3.3V normally)
- Signal change
Check the waveform of each pin.
Voltage scale：1.0V/div
Time scale：500ns/div
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
110
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