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 (3-12.2.) are "
22
"
(Detection of DDC is OK.)
Check item(3-12.5.).
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(3-12.6.).
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(3-12.7.).
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
NO
YES
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
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