Check item(15).
Check the I2C communication line :
Check the CPU.
Is the "
I2C
" waveform of the HDMI OSD [
U1030
] correct (like the
one shown in the diagram) when the power is turned on?
U1030
HSDA
HSCL
Check item(16).
Check the I2C communication line :
Check HDMI OSD [
U1030
], CPU[
U1013
] patterns as well as soldering.
If there is no problem, go to the next step.
Remove the damping resistor [
R1622/R1606
]
of [
U1030
].
Is the "
I2C
" waveform correct?
The CPU [
U1013
] is faulty.
Replace with a new device.
Check the I2C communication line.
Recheck from
check item (1).
If it does not work, replace the PCB.
OSD [
U1030
] is faulty.
Replace with a new device.
YES
*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
NO
YES
YES
NO
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
88
