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 (37) are "
22
"
(Detection of DDC is OK.)
Check item(40).
Checking register of the TMDS CLK detection status
register :
Send the following command from Termite.exe.
HDMI Rx/Tx
Send the command "
i 002E 00FF 0001
".
When the following value is returned, go to Yes.
HDMI In1 "
44
" HDMI In2 "
22
" HDMI In3 "
11
"
When the following value is returned, go to No.
HDMI In1 "
00
" HDMI In2 "
00
" HDMI In3 "
00
"
Check item(42).
Checking register of the TMDS CLK detection status
register :
Send the following command from Termite.exe.
Send the command "
i 0006 00FF 0001
".
When the following value is returned, go to Yes.
"
CC or 44
"
When the following value is returned, go to No.
"
other
"
Check item (41).
Checking the TMDS input waveform. :
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
HDMI In3
137/138/140/141/143/144/146/1
47pin
HDMI In2
124/125/127/128/130/131/133/1
34pin
HDMI In1
83/84/86/87/89/90/92/93pin
U1024
Checking the TMDS status register (HDMI SW)
Checking the TMDS status register (HDMI SW -> HDMI Rx/Tx)
Example
i 002E 00FF 0001
Example
i 0006 00FF 0001
Check for a short circuit in the pattern of the
TMDS line of the HDMI SW [
U1024
] from the
HDMI input terminal.
If there is no problem, the HDMI SW [
U1024
] is
faulty.
Replace with a new device.
HDMI SW [
U1024
] is faulty.
Replace with a new device.
Recheck from
check item (2).
If it does not work, replace the PCB.
YES
YES
YES
NO
NO
NO
YES
Check item (43).
Checking the TMDS input waveform. :
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
55/56/58/59/61/62/64/65pin
U1027
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
HDMI Rx/Tx[
U1027
] is faulty.
Replace with a new device.
HDMI SW [
U1024
] is faulty.
Replace with a new device.
96
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating
