When the results of check item (3-14.4.) are "22"
(Detection of DDC is OK)
Check item(3-14.7.). Check the TMDS CLK detection status of the
register.
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(3-14.8.). 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
U1001
Checking the TMDS status register (Front HDMI Buffer)
HDMI Tx [U1001] is faulty.
Replace with a new device.
Recheck from check item (3.4.)
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 [U1022] is
faulty.
Replace with a new device.
Example
i 0006 00FF 0001
F8
YES
YES NO
NO
Check item(3-14.9.). Check the AUDIO signal output :
Check the AUDIO signal waveform at the following test point.
Is the waveform like the sample?
U1001
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 [U1001] 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 (3.3V normally)
- Signal change
Check the waveform of each pin.
Voltage scale : 1.0V/div
Time scale : 500us/div
Recheck from check item (3.4.)
If it does not work, replace the PCB.
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
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
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General
Weight and Dimensions
