When the results of check item (54) are "
22
"
(Detection of DDC is OK)
Check item(57).
Check the TMDS CLK detection status of the regis-
ter.
Send the following command from Termite.exe.
Send the command "
i 0006 00FF 0001
".
When the following value is returned, go to Yes.
"
F8
"
When the following value is returned, go to No.
"
F0
"
Check item (58).
Checking the TMDS input waveform. :
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
70/71/73/74/76/77/79/80 pin
IC431
Checking the TMDS status register (Front HDMI Buffer)
HDMI Tx (
IC431
) is faulty.
Replace with a new device.
Recheck from
check item (5).
If it does not work, replace the PCB.
Check for a short circuit in the TMDS line and the Front
HDMI FFC.
If there is no problem, the Front HDMI Buffer (
IC101
) is
faulty.
Replace with a new device.
Example
i 0006 00FF 0001
F8
YES
YES
NO
TMDS Signal
3.3V
Example of waveform in check ①
TMDS
Example of waveform in check ②
NO
Check item(59).
Check the AUDIO signal output :
Check the AUDIO signal waveform at the following test point.
Is the waveform like the sample?
IC221
The DIGITAL AUDIO block is faulty.
Check the DIGITAL AUDIO device.
Check "
AUDIO
" in troubleshooting.
If it does not work, replace the PCB.
HDMI Tx (
IC431
) is faulty.
Replace with a new device.
YES
NO
3.3V
The diagram shows an example of the wave-
form of I2S0.
Waveform check points
- Crest value (3.3 V normally)
- Signal change
Check the waveform of each pin.
Recheck from
check item (5).
If it does not work, replace the PCB.
124
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating
