When the results of check item (29) are "the communication results are not OK"
Check item(30).
Check of power supply voltage of
HDMI Tx :
Is the voltage at the test point of each power sup-
ply pin correct? (1.1 V)
The test points are as follows.
Check item(32).
Check the reset of HDMI TX :
Check the waveform .
Is the waveform at the test point TP (
U1039
) correct when power is
turned on?
Check item(31).
Check the power supply voltage.
Check the power supply components (
U1064
) on
the substrate and peripheral pattern.
If there is no problem, remove the HDMI Tx
(
U1039
) from the substrate and measure the volt-
age at the test point of
check item (30)
.
Is the power supply voltage correct? (1.1 V )
Check the power supply voltage.
Checking device. (HDMI Tx)
HDMI Tx (
U1039
) is faulty.
Replace with a new device.
Recheck from
check item (4).
If it does not work, replace the PCB.
Recheck from
check item (4).
If it does not work, replace the PCB.
Replace (
R1882
) and (
R1883
) with new resistors
and check the I2C communication again.
Check item (32)
If the result is not OK, the HDMI
Tx (
U1039
) is faulty. Replace with a new device.
Check the reset circuit between CPU (
U1018
) and
HDMI Tx (
U1039
).
If there is no problem, the HDMI Tx (
U1039
) is
faulty.
Replace with a new device.
The power supply circuit is faulty.
Replace the PCB.
YES
NO
NO
NO
YES
Example of the waveform to be
checked
94
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating
