When the results of check item (3-15.2.) are "
22 or 11
"
(Detection of DDC is OK.)
Check item(3-15.5.).
Checking register of the TMDS CLK detection sta-
tus 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(3-15.6.).
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 (3.3.)
If it does not work, replace the PCB.
YES
NO
NO
NO
YES
YES
Check item(3-15.7.).
Check the TMDS CLK detection status of the regis-
ter.
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(3-15.8.).
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 (3.3.)
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
126
