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3-13. HDMI transmission IC [MN864788] failure detection procedure
Checking operation between the HDMI (Rx) device and the HDMI device (Tx).
Checking operation between the HDMI (Tx) device and TV.
HDMI1 in
HDMI4 in
Video Conversion OFF
Checking the TMDS status register (HDMI Rx -> HDMI Tx)
Check item(56).
Check the TMDS CLK detection status of the
register :
Send the following command from Termite.exe.
Send the command
"i 0006 00FF
0001".
When checking the signal path from HDMI1 to HDMI OUT
"72" : Go to Yes.
"74" : Go to No.
When checking the signal path from HDMI4 IN to HDMI OUT
"71" : Go to Yes.
"74" : Go to No.
NO
Check item(57).
Checking the TMDS input. :
TMDS waveform at the following points.
Between HDMI Rx1 and HDMI Tx
80/81/83/84/86/87/89/90 pin
U1039
Between HDMI Rx2 and HDMI Tx
93/94/96/97/99/100/102/103 pin
NO
HDMI Tx [U1039] is faulty.
Replace with a new device.
YES
Recheck from
check item (3).
If it does not work, replace the PCB.
HDMI OUT
Example
YES
The first operation : Checking
between Monitor and the TV.
Go to
check item (58)
3.3V
TMDS Signal
Example of waveform in check ① Example of waveform in check ②
Voltage scale：1.0V/div
Time scale：20ms/div
NO
If it is No between HDMI Rx1 and HDMI Tx.
HDMI Rx1 [U1000] is faulty.
Replace with a new device.
If it is No between HDMI Rx2 and HDMI Tx.
HDMI Rx2 [U1003] is faulty.
Replace with a new device.
Checking between Monitor and the TV.
Connect Monitor to the TV and check the following items with the TV turned on.
Checking the HPD/RXSENSE status register. (HDMI TX -> Monitor)
Check item(58).
Check the HPD and RXSENSE register value of
the HDMI TX device. :
Send the following command from Termite.exe.
Send the command
"i 0000 0040
0001".
Move to the branch destination according to the value returned.
"30"
(Detection of HPD is OK / Detection of RXSENSE is OK )
"10"
(Detection of HPD is OK / Detection of RXSENSE is not OK )
"20"
(Detection of HPD is not OK / Detection of RXSENSE is OK )
"00"
(Detection of HPD is not OK / Detection of RXSENSE is not OK )
TMDS
Voltage scale：1.0V/div
Time scale：1s/div
112
Example
Go to
check item (59)
Go to
check item (62)
Go to
check item (63)
Go to
check item (64)
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