YES
YES
YES
Check the I2C communication line. (HDMI Rx)
Check item(14).
Check the I2C communication line :
Check the CPU.
Is the "
I2C
" waveform of the TP near the HDMI Rx1 [
U1000
]
correct (like the one shown in the diagram) when the power is
turned on?
U1000
HSDA
HSCL
HDMI Rx1 [
U1000
] is faulty.
Replace with a new device.
Recheck from
check item (1).
If it does not work, replace the PCB.
Check item(15).
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.
NO
*The diagram shows an example.
(Signal patterns vary depending on the
timing.)
Points for checking waveforms
- Crest value (3.3V normally)
- Signal change
- SCL frequency (400kHz normally)
Voltage scale：1.0V/div
Time scale：10us/div
HDMI Rx1 [
U1000
] is faulty.
Replace with a new device.
Check the HDMI Rx1.
Remove the damping resistor [
R1061/R1062
] of [
U1000
].
Is the "
I2C
" waveform correct?
Recheck from
check item (1).
If it does not work, replace the PCB.
YES
NO
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
95
