3-3 HDMI SW(MN864788A) failure detection procedure
Check communication between CPU and the HDMI (HDMI SW) device.
When the results of check item (18) are "the communication results are not OK"
Checking HDMI (HDMI SW) device.
Check item (18). : Check communication between CPU and the
HDMI Rx device.
Check by reading device ID and revision of each device.
Check communication between SW(IC701) and CPU(IC751) .
Send the transmission command "i 0028 0000 0001" from Termite.
exe.
Is the return value "01" ?
If the communication results are not OK
If the communication results are OK
Example :
If it is normal, "01" is returned.
i 0028 0040 0001
01
Go to check item (21)
Go to check item (19)
Checking HDMI (HDMI SW) device
YES
YES NO
Checking the reset waveform (HDMI SW)
Check item(19). Checking the reset waveform :
Check the waveform.
Is the "I2C" waveform of the TP near the HDMI SW(IC701 115pin)
correct (like the one shown in the diagram) when the power is
turned on?
115pin
Check the reset circuit between
CPU (IC751) and HDMI SW(IC701).
If there is no problem, the HDMI
SW (IC701) is faulty.
Replace with a new device.
NO
Examples of conrmation waveform
Check item(20). Checking the HDMI SW. :
Replace R7136 and R7138 with new resistors and check the I2C
communication again. (Check item (18)).
Is the return value "01" ?
HDMI SW (IC701)
is faulty. Replace with a new device.
Recheck from check item (2).
If it does not work, replace the PCB.
81
Caution in
servicing
Electrical Mechanical Repair Information Updating
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