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3-9. Front HDMI Buffer IC [AD8195] failure detection procedure
Checking operation between the HDMI (Front HDMI Buffer) and the player
b In order to check, connect the player to the HDMI terminal and configure the player as AVR source.
Check the sound output while turning on the player.
Check the power supply voltage. (HDMI Buffer)
Check item(44).
Check the power supply voltage. :
Does the power supply voltage of the Front HDMI FFC base [N1014] indicate the correct voltage (5V)?
The test points are as follows.
N1014
+5V 17pin
YES
Check item(45).
Check the power supply voltage. :
Check the FETSW and peripheral pattern.
If there is no problem, remove the Front HDMI FFC from the substrate and measure the voltage
at the test point of
check item
(44).
Is the power supply voltage correct (5 V)?
YES
Front HDMI Buffer [U3000] is faulty.
Replace with a new device.
Recheck from
check item (2).
If it does not work, replace the PCB.
NO
NO
Replace the FET SW[Q1070] and recheck from
check item
(40). If it does not work, replace the
PCB.
Checking the +5V/DDC status register (Front HDMI Buffer)
Check item(46).
Checking the 5V status of the register :
Send the following command from Termite.exe.
Send the command
"i 002E 00FF
0001".
Move to the branch destination according to the value returned.
"00"
(Detection of 5V is not OK.)
"88 or
80"
(Detection of 5V is OK)
Check item(47).
Checking the status of the register :
Send the following command from Termite.exe.
Send the command
"i 002B 00B4
0001".
Move to the branch destination according to the value returned.
"00 or
04"
(Detection of DDC is not OK.)
"22"
(Detection of DDC is OK)
97
Example
i 002E 00FF 0001
Go to
check item (48)
Example
i 002B 0084 0001
Go to
check item (49)
Go to
check item (50)
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