YES
YES
YES
YES
Check the I2C communication line. (HDMI Rx)
Check item(19). 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?
U1003
HSDA
HSCL
HDMI Rx2 [U1003] is faulty.
Replace with a new device.
HDMI Rx [U1003] is faulty.
Replace with a new device.
Recheck from check item (1).
If it does not work, replace the PCB.
Check item(20). Check the I2C com-
munication line :
Check HDMI Rx [U1003] patterns as
well as soldering.
If there is no problem, go to the next
step.
Check the HDMI Rx2.
Remove the damping resistor [R1169/R1170] of [U1003].
Is the "I2C" waveform correct?
Recheck from check item (1).
If it does not work, replace the PCB.
NO
YES NO
*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 )
Voltage scale：1.0V/div
Time scale：10us/div
95
Caution in
servicing
Electrical Mechanical Repair Information Updating
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