3-14. Front HDMI Buffer (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 item(3-14.1.).
Check the power supply voltage. :
Does the power supply voltage of the Front HDMI FFC base [
N1000
] indicate the correct voltage (
5V
)?
The test points are as follows.
N1000
7pin
Check item(3-14.3.).
Checking the 5V status register :
Send the following command from Termite.exe.
Send the command "
i 0006 00FF 0001
".
Check the value.
Move to the branch destination according to the value returned.
Check the power supply voltage. (Front HDMI Buffer)
Checking the +5V/DDC status register (Front HDMI Buffer)
Check item(3-14.2.).
Check the power supply voltage. :
Check the FFT SW [
Q1058
] 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 (3-14.1.)
.
Is the power supply voltage correct (5V)?
Front HDMI Buffer [
U1022
] is faulty.
Replace with a new device.
Example
i 0006 00FF 0001
F8
"
78 or 70
"
(Detection of 5V is not OK.)
"
00 or 04
"
(Detection of DDC is not OK.)
"
F8 or F0
"
(Detection of 5V is OK)
"
22
"
(Detection of DDC is OK)
Go to
check item (3-14.5.)
Go to
check item (3-14.6.)
Go to
check item (3-14.7.)
Replace the FET SW [
Q1058
] and recheck from
check item (3-14.1.)
.
If it does not work, replace the PCB.
Recheck from
check item (3.4.)
If it does not work, replace the PCB.
YES
YES
NO
NO
Check item(3-14.4.).
Checking the status register :
Send the following command from Termite.exe.
Send the command "
i 0003 00B4 0001
".
Check the value.
Move to the branch destination according to the value returned.
Example
i 0003 00B4 0001
22
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
131
