When the results of check item (3-17.2.) are "
22
"
(Detection of DDC is OK)
Check item(3-17.5.).
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(3-17.6.).
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
U3401
Checking the TMDS status register (HDMI DDC Buffer)
HDMI Tx [
U3401
] 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 HDMI DDC Buffer [
U5501
] is
faulty.
Replace with a new device.
Example
i 0006 00FF 0001
F8
YES
YES
NO
NO
Check item(3-17.7.).
Check the AUDIO signal output :
Check the AUDIO signal waveform at the following test point.
Is the waveform like the sample?
(MCK/64FS/FS/I2S0/I2S1/I2S2/I2S3/SPDIF)
U3401
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 [
U3401
] 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.
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
138
