YES
YES
YES
YES
Checking the reset waveform (HDMI Rx)
Check the I2C communication line. (HDMI Rx)
Check item(10).
Checking the reset waveform :
Check the waveform.
Is the "
RESET
" waveform of the TP near the HDMI Rx (
U1000
or
U1003
) correct (like the one shown in the diagram) when the
power is turned on?
HDMI Rx1
(When checking HDMI inputs 1,
2, and 3)
HDMI Rx2
(When checking HDMI inputs 4,
5, 6, and 7)
RESET
RESET
Check item(11).
Check the I2C communication line :
Check the CPU.
Is the "
I2C
" waveform of the TP near the HDMI Rx (
U1000
)
correct (like the one shown in the diagram) when the power is
turned on?
HDSA
HSCL
Check the reset circuit between
CPU (
U1018
) and HDMI Rx (
U1000
or
U1003
).
If there is no problem, the HDMI
Rx (
U1000
or
U1003
) is faulty.
Replace with a new device.
Recheck from
check item (3)
.
If it does not work, replace the
PCB.
HDMI Rx1(
U1000
) is
faulty.
Replace with a new
device.
HDMI Rx2(
U1003
) is
faulty.
Replace with a new
device.
HDMI Tx(
U1039
) is
faulty.
Replace with a new
device.
CPU(
U1018
) is faulty.
Replace with a new
device.
HDMI Rx (
U1000
or
U1003
) is faulty.
Replace with a new device.
Recheck from
check item (3).
If it does not work, replace the PCB.
Check item(12).
Check the I2C com-
munication line :
Check HDMI Rx (
U1000
or
U1003
),
HDMI Tx (
U1039
) and CPU (
U1018
)
patterns as well as soldering.
If there is no problem, go to the next
step.
Checking the HDMI Rx2.
Remove the damping resistor
(
R1169/R1170
) of (
U1003
).
Is the "I2C" waveform correct?
Recheck from
check item (3).
If it does not work, replace the PCB.
Checking the HDMI Tx.
Remove the damping resistor
(
R1882
/
R1883
) of (
U1039
).
Is the "I2C" waveform correct?
Checking the HDMI Rx1.
Remove the damping resistor
(
R1061/R1062
) of (
U1000
).
Is the "I2C" waveform correct?
NO
NO
NO
NO
YES
YES
YES
NO
Examples of confirmation waveform
*The diagram shows an example.
(Signal patterns vary depending on the
timing.)
Points for checking waveforms
- Crest value (3.3 V normally)
- Signal change
- SCL frequency (400 kHz normally )
86
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating
