Check item (37). Check communication between CPU and the
HDMI Tx device.
Check by reading device ID and revision of each device.
Send the transmission command "i 00B2 00EA 0002" from Ter-
mite.exe.
Is the returned value "4002"?
Checking HDMI (OSD) device.
Check the I2C communication.
Example
If normal, "4002" is returned.
i 00B2 00EA 0002
4002
When the results of check item (37) are "the communication results are not OK"
Check item(38). Check the power supply voltage
:
Does the power supply voltage of the GUI(IC731)
indicate the appropriate voltage (1.8V, 3.3V)?
The test points are as follows.
6pin
93pin
Check item(39). Check the power supply voltage
:
Check the power supply components (IC744,
Q7408, IC741, Q7410) on the substrate and pe-
ripheral pattern.
If there is no problem, remove the OSD (IC731)
from the substrate and measure the voltage at
the test point of check item (38).
Is the voltage correct (1.8 V or 3.3 V)?
Check the power supply voltage.
Checking HDMI (OSD) device.
Go to next page.
3-5 OSD(ADV7623) failure detection procedure
If the communication results are OK
If the communication results are not OK
Go to check item (43)
Go to check item (38)
NO
HDMI OSD(IC731) is faulty.
Replace with a new device.
Recheck from check item (3).
If it does not work, replace the PCB.
The power supply circuit is faulty.
Replace the PCB.
NOYES
YES
88
Caution in
servicing
Electrical Mechanical Repair Information Updating
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