YES
YES
YES
Check the I2C communication line. (HDMI Rx/TX)
Check item(8). Check the I2C communication line :
Check the waveform.
Is the "I2C" waveform of the TP HDMI Rx/Tx [U1027] correct
(like the one shown in the diagram) when the power is turned
on?
U1027
P_CK 114pin
P_DA 116pin
HDMI Rx/Tx [U1027] is
faulty. Replace with a
new device.
HDMI SW [U1024] is
faulty. Replace with a
new device.
The CPU [U1013] is
faulty. Replace with a
new device.
HDMI Rx/Tx[U1027] is faulty.
Replace with a new IC.
Recheck from check item (1).
If it does not work, replace the PCB.
Check item(9). Check the I2C commu-
nication line :
Check HDMI Rx/Tx [U1027],
CPU[U1013] patterns as well as solder-
ing.
If there is no problem, go to the next
step.
Check the HDMI SW.
Remove the damping resistor
[R1974/R1975] of [U1024].
Is the "I2C" waveform correct?
Recheck from check item (1).
If it does not work, replace the PCB.
Check the HDMI Rx/Tx.
Remove the damping resistor
[R1537/R1538] of [U1027].
Is the "I2C" waveform correct?
NO
NO
YES YES NO
*The diagram shows an example.
(Signal patterns vary depending on the tim-
ing.)
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
82
Caution in
servicing
Electrical Mechanical Repair Information Updating
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