When the results of check item (56) are "22 or 11"
(Detection of DDC is OK.)
Check item(59). Checking register of the TMDS CLK detection status
register :
Send the following command from Termite.exe.
Send the command "i 0056 00FF 0001".
When the following value is returned, go to YES.
HDMI IN1 "88", HDMI IN2 "44", HDMI IN3 "22", HDMI IN4 "11"
When the following value is returned, go to NO.
HDMI IN1 "80", HDMI IN2 "40", HDMI IN3 "20", HDMI IN4 "10"
Check item(60). Checking the TMDS input waveform. :
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
HDMI IN1
42/43/45/46/48/49/51/52 pin
HDMI IN2
55/56/58/59/61/62/64/65 pin
HDMI IN3
80/81/83/84/86/87/89/90 pin
HDMI IN4
93/94/96/97/99/100/ 102/103 pin
U2601
Checking the TMDS status register (HDMI Switcher2)
Example
i 0056 00FF 0001
Check for a short circuit in the pattern of the
TMDS line of the HDMI Switcher2 [U2601] from
the HDMI input terminal.
If there is no problem, the HDMI Switcher2
[U2601] is faulty.
Replace with a new device.
HDMI Switcher2 [U2601] is faulty.
Replace with a new device.
Recheck from check item (3).
If it does not work, replace the PCB.
YES
NO
NO
NOYES
YES
Check item(61). Check the TMDS CLK detection status of the register :
Send the following command from Termite.exe.
Send the command "i 002E 00FF 0001".
Is the return value "88" ?
Checking the TMDS status register (HDMI Switcher2 -> HDMI Switcher1)
Check item(62). Checking the TMDS input waveform. :
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
42/43/45/46/48/49/51/52 pin
U2401
HDMI Switcher1 [U2401] is faulty.
Replace with a new device.
Recheck from check item (3).
If it does not work, replace the PCB.
Check for a short circuit in the TMDS line.
If there is no problem, the HDMI Switcher2 [U2601] is faulty.
Replace with a new device.
NO
Example :
If it is normal, "88" is returned.
i 002E 00FF 0001
88
YES
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
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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